diff --git a/.documentup.json b/.documentup.json
deleted file mode 100644
index 57fe30116..000000000
--- a/.documentup.json
+++ /dev/null
@@ -1,6 +0,0 @@
-{
-  "name": "ShellJS",
-  "twitter": [
-    "r2r"
-  ]
-}
diff --git a/.editorconfig b/.editorconfig
index a35cd0dca..afe97de28 100644
--- a/.editorconfig
+++ b/.editorconfig
@@ -10,5 +10,8 @@ indent_style = space
 insert_final_newline = true
 trim_trailing_whitespace = true
 
+[*.js]
+quote_type = single
+
 [*.{md,markdown}]
 trim_trailing_whitespace = false
diff --git a/.eslintrc.json b/.eslintrc.json
index 411b11ae0..4f40d77b8 100644
--- a/.eslintrc.json
+++ b/.eslintrc.json
@@ -2,28 +2,47 @@
   "env": {
     "node": true
   },
-  "extends": "airbnb-base/legacy",
+  "extends": "airbnb-base",
   "rules": {
-    "comma-dangle": 0,
-    "global-require": 0,
-    "vars-on-top": 0,
-    "spaced-comment": [2, "always", { "markers": ["@", "@include"], "exceptions": ["@", "@commands"] }],
-    "no-param-reassign": 0,
-    "no-console": 0,
-    "curly": [2, "multi-line"],
-    "func-names": 0,
-    "quote-props": 0,
-    "no-underscore-dangle": 0,
-    "max-len": 0,
-    "no-use-before-define": 0,
-    "no-empty": 0,
-    "no-else-return": 0,
-    "no-throw-literal": 0,
-    "newline-per-chained-call": 0,
-    "consistent-return": 0,
-    "no-mixed-operators": 0,
-    "no-prototype-builtins": 0,
-    "new-cap": [2, {
+    "comma-dangle": ["error", "always-multiline"],
+    "consistent-return": "off",
+    "curly": ["error", "multi-line"],
+    "func-names": "off",
+    "function-call-argument-newline": "off",
+    "function-paren-newline": "off",
+    "global-require": "off",
+    "import/no-unresolved": "off",
+    "indent": "off",
+    "max-len": "off",
+    "newline-per-chained-call": "off",
+    "no-bitwise": "off",
+    "no-console": "off",
+    "no-continue": "off",
+    "no-else-return": "off",
+    "no-empty": "off",
+    "no-mixed-operators": "off",
+    "no-multi-spaces": "off",
+    "no-multiple-empty-lines": ["error", { "max": 2, "maxBOF": 0, "maxEOF": 0 } ],
+    "no-param-reassign": "off",
+    "no-plusplus": "off",
+    "no-prototype-builtins": "off",
+    "no-throw-literal": "off",
+    "no-underscore-dangle": "off",
+    "no-use-before-define": "off",
+    "no-var": "off",
+    "operator-linebreak": "off",
+    "prefer-arrow-callback": "off",
+    "prefer-destructuring": "off",
+    "prefer-numeric-literals": "off",
+    "prefer-object-spread": "off",
+    "prefer-rest-params": "off",
+    "prefer-spread": "off",
+    "prefer-template": "off",
+    "quote-props": "off",
+    "spaced-comment": ["error", "always", { "markers": ["@", "@include"], "exceptions": ["@", "@commands"] }],
+    "strict": "off",
+    "vars-on-top": "off",
+    "new-cap": ["error", {
       "capIsNewExceptions": [
         "ShellString"
       ]}
diff --git a/.github/ISSUE_TEMPLATE.md b/.github/ISSUE_TEMPLATE.md
index 13d777fbc..172af387f 100644
--- a/.github/ISSUE_TEMPLATE.md
+++ b/.github/ISSUE_TEMPLATE.md
@@ -1,3 +1,7 @@
+<!--
+Before posting your issue, please check our FAQ:
+    https://github.com/shelljs/shelljs/wiki/FAQ
+-->
 ### Node version (or tell us if you're using electron or some other framework):
 
 ### ShellJS version (the most recent version/Github branch you see the bug on):
diff --git a/.github/SECURITY.md b/.github/SECURITY.md
new file mode 100644
index 000000000..4c96dd513
--- /dev/null
+++ b/.github/SECURITY.md
@@ -0,0 +1,31 @@
+# ShellJS Security Policy
+
+Thank you for reaching out regarding the security of the ShellJS module! Please
+note that this project is maintained on a best-effort basis, however I still
+intend to prioritize reviewing and addressing security issues.
+
+## Supported Versions
+
+I generally only support the latest ShellJS release (see
+https://www.npmjs.com/package/shelljs). My goal is to release security fixes as
+patch releases on top of whatever was most recently shipped.
+
+If breaking changes have already landed on the main development branch, I may
+apply the patch on the relevant release branch (ex.
+[`0.8-release`](https://github.com/shelljs/shelljs/commits/0.8-release)) and
+create a new release from there.
+
+## Reporting a Vulnerability
+
+Please report security vulnerabilities to ntfschr@gmail.com. I should respond
+within a few days. Although it's not strictly required, it helps me out if you
+can include any proof of concept exploit code, suggested fix, etc.
+
+**Please do not publicly disclose the suspected vulnerability** until I have a
+chance to review your report. I'd like a chance to patch the code before the
+issue is known to the public.
+
+Please **only** use this email for security issues. It's also OK to use the
+email if you're legitimately unsure if this is a security issue (better safe
+than sorry). But for all other non-security issues, please use the GitHub issue
+tracker.
diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
new file mode 100644
index 000000000..6c207c2bb
--- /dev/null
+++ b/.github/workflows/main.yml
@@ -0,0 +1,36 @@
+name: CI
+on:
+  - push
+  - pull_request
+jobs:
+  test:
+    name: Node.js ${{ matrix.node-version }} on ${{ matrix.os }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        node-version:
+          - 18
+          - 20
+          - 22
+          - 24
+          - 26
+        os:
+          - ubuntu-latest
+          - macos-latest
+          - windows-latest
+    steps:
+      - uses: actions/checkout@v6
+      - uses: actions/setup-node@v6
+        with:
+          node-version: ${{ matrix.node-version }}
+      - run: npm install
+      - name: test with coverage
+        run: npm run test-with-coverage
+      - run: npm run lint
+      - run: npm run check-node-support
+      - name: Upload coverage reports to Codecov
+        uses: codecov/codecov-action@v7
+        with:
+          token: ${{ secrets.CODECOV_TOKEN }}
+          fail_ci_if_error: true
diff --git a/.travis.yml b/.travis.yml
deleted file mode 100644
index 49666f084..000000000
--- a/.travis.yml
+++ /dev/null
@@ -1,41 +0,0 @@
-language: c++
-sudo: false
-env:
-  - NODE_VERSION="0.11"
-  - NODE_VERSION="0.12"
-  - NODE_VERSION="iojs-v1"
-  - NODE_VERSION="iojs-v2"
-  - NODE_VERSION="iojs-v3"
-  - NODE_VERSION="4"
-  - NODE_VERSION="5"
-  - NODE_VERSION="6"
-  - NODE_VERSION="7"
-
-# keep this blank to make sure there are no before_install steps
-before_install:
-
-install:
-  - rm -rf ~/.nvm
-  - git clone https://github.com/creationix/nvm.git ~/.nvm
-  - source ~/.nvm/nvm.sh
-  - nvm install $NODE_VERSION
-  - node --version
-  - npm install
-os:
-  - linux
-  - osx
-script:
-  - npm test
-  # make sure when the docs are generated nothing changes (a.k.a. the docs have already been generated)
-  - npm run gendocs
-  - npm run after-travis "Make sure to generate docs!"
-
-# Gitter
-notifications:
-  email: false
-  webhooks:
-    urls:
-      - https://webhooks.gitter.im/e/743dc6b83b6dd05111ee
-    on_success: change  # options: [always|never|change] default: always
-    on_failure: always  # options: [always|never|change] default: always
-    on_start: never     # options: [always|never|change] default: always
diff --git a/CHANGELOG.md b/CHANGELOG.md
index e66d72cf9..c30d70896 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,260 @@
 # Change Log
 
+## [v0.8.5](https://github.com/shelljs/shelljs/tree/v0.8.5) (2022-01-13)
+[Full Changelog](https://github.com/shelljs/shelljs/compare/v0.8.4...v0.8.5)
+
+This was a small security fix for [\#1058](https://github.com/shelljs/shelljs/issues/1058).
+
+## [v0.8.4](https://github.com/shelljs/shelljs/tree/v0.8.4) (2020-04-24)
+[Full Changelog](https://github.com/shelljs/shelljs/compare/v0.8.3...v0.8.4)
+
+Small patch release to fix a circular dependency warning in node v14. See [\#973](https://github.com/shelljs/shelljs/issues/973).
+
+## [v0.8.3](https://github.com/shelljs/shelljs/tree/v0.8.3) (2018-11-13)
+[Full Changelog](https://github.com/shelljs/shelljs/compare/v0.8.2...v0.8.3)
+
+**Closed issues:**
+
+- Shelljs print stderr to console even if exec-only "silent" is true [\#905](https://github.com/shelljs/shelljs/issues/905)
+- refactor: remove common.state.tempDir [\#902](https://github.com/shelljs/shelljs/issues/902)
+- Can't suppress stdout for echo [\#899](https://github.com/shelljs/shelljs/issues/899)
+- exec\(\) doesn't apply the arguments correctly [\#895](https://github.com/shelljs/shelljs/issues/895)
+- shell.exec\('npm pack'\) painfully slow [\#885](https://github.com/shelljs/shelljs/issues/885)
+- shelljs.exec cannot find app.asar/node\_modules/shelljs/src/exec-child.js [\#881](https://github.com/shelljs/shelljs/issues/881)
+- test infra: mocks and skipOnWin conflict [\#862](https://github.com/shelljs/shelljs/issues/862)
+- Support for shell function completion on IDE [\#859](https://github.com/shelljs/shelljs/issues/859)
+- echo command shows options in stdout [\#855](https://github.com/shelljs/shelljs/issues/855)
+- silent does not always work [\#851](https://github.com/shelljs/shelljs/issues/851)
+- Appveyor installs the latest npm, instead of the latest compatible npm [\#844](https://github.com/shelljs/shelljs/issues/844)
+- Force symbolic link \(ln -sf\) does not overwrite/recreate existing destination [\#830](https://github.com/shelljs/shelljs/issues/830)
+- inconsistent result when trying to echo to a file [\#798](https://github.com/shelljs/shelljs/issues/798)
+- Prevent require\(\)ing executable-only files [\#789](https://github.com/shelljs/shelljs/issues/789)
+- Cannot set property to of \[object String\] which has only a getter [\#752](https://github.com/shelljs/shelljs/issues/752)
+- which\(\) should check executability before returning a value [\#657](https://github.com/shelljs/shelljs/issues/657)
+- Bad encoding experience [\#456](https://github.com/shelljs/shelljs/issues/456)
+- phpcs very slow [\#440](https://github.com/shelljs/shelljs/issues/440)
+- Error shown when triggering a sigint during shelljs.exec if process.on sigint is defined [\#254](https://github.com/shelljs/shelljs/issues/254)
+- `.to\(file\)` does not mute STDIO output [\#146](https://github.com/shelljs/shelljs/issues/146)
+- Escaping shell arguments to exec\(\) [\#143](https://github.com/shelljs/shelljs/issues/143)
+- Allow multiple string arguments for exec\(\) [\#103](https://github.com/shelljs/shelljs/issues/103)
+- cp does not recursively copy from readonly location  [\#98](https://github.com/shelljs/shelljs/issues/98)
+- Handling permissions errors on file I/O [\#64](https://github.com/shelljs/shelljs/issues/64)
+
+**Merged pull requests:**
+
+- Add test case for sed on empty file [\#904](https://github.com/shelljs/shelljs/pull/904) ([wyardley](https://github.com/wyardley))
+- refactor: don't expose tempdir in common.state [\#903](https://github.com/shelljs/shelljs/pull/903) ([nfischer](https://github.com/nfischer))
+- chore\(ci\): fix codecov on travis [\#897](https://github.com/shelljs/shelljs/pull/897) ([nfischer](https://github.com/nfischer))
+- chore\(npm\): add ci-or-install script [\#896](https://github.com/shelljs/shelljs/pull/896) ([nfischer](https://github.com/nfischer))
+- Fix silent exec [\#892](https://github.com/shelljs/shelljs/pull/892) ([nfischer](https://github.com/nfischer))
+- chore\(appveyor\): run entire test matrix [\#886](https://github.com/shelljs/shelljs/pull/886) ([nfischer](https://github.com/nfischer))
+- docs: remove gitter badge [\#880](https://github.com/shelljs/shelljs/pull/880) ([nfischer](https://github.com/nfischer))
+- grep includes the i flag [\#876](https://github.com/shelljs/shelljs/pull/876) ([ppsleep](https://github.com/ppsleep))
+- Fix\(which\): match only executable files \(\#657\) [\#874](https://github.com/shelljs/shelljs/pull/874) ([termosa](https://github.com/termosa))
+- chore: rename some tests [\#871](https://github.com/shelljs/shelljs/pull/871) ([nfischer](https://github.com/nfischer))
+- Fix cp from readonly source [\#870](https://github.com/shelljs/shelljs/pull/870) ([nfischer](https://github.com/nfischer))
+- chore: bump dev dependencies and add package-lock [\#864](https://github.com/shelljs/shelljs/pull/864) ([nfischer](https://github.com/nfischer))
+- fix\(mocks\): fix conflict between mocks and skip [\#863](https://github.com/shelljs/shelljs/pull/863) ([nfischer](https://github.com/nfischer))
+- chore: output npm version in travis [\#850](https://github.com/shelljs/shelljs/pull/850) ([nfischer](https://github.com/nfischer))
+- Prevent require-ing bin/shjs [\#848](https://github.com/shelljs/shelljs/pull/848) ([freitagbr](https://github.com/freitagbr))
+- chore\(appveyor\): do not use latest npm [\#847](https://github.com/shelljs/shelljs/pull/847) ([nfischer](https://github.com/nfischer))
+- chore: update shelljs-release version [\#846](https://github.com/shelljs/shelljs/pull/846) ([nfischer](https://github.com/nfischer))
+
+## [v0.8.2](https://github.com/shelljs/shelljs/tree/v0.8.2) (2018-05-08)
+[Full Changelog](https://github.com/shelljs/shelljs/compare/v0.8.1...v0.8.2)
+
+**Closed issues:**
+
+- High severity vulnerability in shelljs 0.8.1 [\#842](https://github.com/shelljs/shelljs/issues/842)
+- Add test for ls\(\) on a symlink to a directory [\#795](https://github.com/shelljs/shelljs/issues/795)
+- Harden shell.exec by writing the child process in a source file [\#782](https://github.com/shelljs/shelljs/issues/782)
+- shell.exec\(\) doesn't respond correctly to config.fatal = true [\#735](https://github.com/shelljs/shelljs/issues/735)
+- Merge 'exec: internal error' with ShellJSInternalError [\#734](https://github.com/shelljs/shelljs/issues/734)
+- exec returning null from command [\#724](https://github.com/shelljs/shelljs/issues/724)
+- Only Get Stderr from Exec [\#371](https://github.com/shelljs/shelljs/issues/371)
+- Execute child.stdout.on before child.on\("exit"\)  [\#224](https://github.com/shelljs/shelljs/issues/224)
+
+**Merged pull requests:**
+
+- Workaround codecov bug of miscalculation of coverage \(\#795\) [\#838](https://github.com/shelljs/shelljs/pull/838) ([dwi2](https://github.com/dwi2))
+- Update doc comments and regenerate README.md. [\#825](https://github.com/shelljs/shelljs/pull/825) ([Zearin](https://github.com/Zearin))
+- chore: update contributing guidelines [\#817](https://github.com/shelljs/shelljs/pull/817) ([nfischer](https://github.com/nfischer))
+- chore\(lint\): don't allow excess trailing newlines [\#816](https://github.com/shelljs/shelljs/pull/816) ([nfischer](https://github.com/nfischer))
+- Remove separate "internal error" from exec [\#802](https://github.com/shelljs/shelljs/pull/802) ([freitagbr](https://github.com/freitagbr))
+
+## [v0.8.1](https://github.com/shelljs/shelljs/tree/v0.8.1) (2018-01-20)
+[Full Changelog](https://github.com/shelljs/shelljs/compare/v0.8.0...v0.8.1)
+
+**Closed issues:**
+
+- Exec failing with internal error when piping large output [\#818](https://github.com/shelljs/shelljs/issues/818)
+
+**Merged pull requests:**
+
+- Revert "refactor\(exec\): remove paramsFile \(\#807\)" [\#819](https://github.com/shelljs/shelljs/pull/819) ([nfischer](https://github.com/nfischer))
+
+## [v0.8.0](https://github.com/shelljs/shelljs/tree/v0.8.0) (2018-01-12)
+[Full Changelog](https://github.com/shelljs/shelljs/compare/v0.7.8...v0.8.0)
+
+**Closed issues:**
+
+- Snyk vulnerability DB reporting command injection vulnerability in ShellJS [\#810](https://github.com/shelljs/shelljs/issues/810)
+- chore: upgrade nyc [\#803](https://github.com/shelljs/shelljs/issues/803)
+- Update CI to use Node v9 [\#799](https://github.com/shelljs/shelljs/issues/799)
+- Link to FAQ wiki section in our issue template [\#787](https://github.com/shelljs/shelljs/issues/787)
+- Is it possible to get a js library\(file\) for ShellJS [\#776](https://github.com/shelljs/shelljs/issues/776)
+- 48, [\#774](https://github.com/shelljs/shelljs/issues/774)
+- 47 [\#773](https://github.com/shelljs/shelljs/issues/773)
+- Exec function calls JSON.stringify on command [\#772](https://github.com/shelljs/shelljs/issues/772)
+- getting different result from terminal and with shelljs  [\#769](https://github.com/shelljs/shelljs/issues/769)
+- test\(\) does not support -w and -x options [\#768](https://github.com/shelljs/shelljs/issues/768)
+- Snyk "high severity" issue [\#766](https://github.com/shelljs/shelljs/issues/766)
+- Snyk "high security [\#765](https://github.com/shelljs/shelljs/issues/765)
+- ShellJS doesn't respect NPM Registry being set outside of it [\#761](https://github.com/shelljs/shelljs/issues/761)
+- Run second shell script [\#756](https://github.com/shelljs/shelljs/issues/756)
+- shelljs seems NOT compatible with nexe under CentOS 6.5 [\#754](https://github.com/shelljs/shelljs/issues/754)
+- Feature request: pushd/popd -q option [\#753](https://github.com/shelljs/shelljs/issues/753)
+- cat doesn't support '-n' option [\#750](https://github.com/shelljs/shelljs/issues/750)
+- shelljs run xcodebuild error [\#749](https://github.com/shelljs/shelljs/issues/749)
+- Add wrappers around fs.statSync and fs.lstatSync [\#745](https://github.com/shelljs/shelljs/issues/745)
+- Improve coverage for exec\(\) [\#742](https://github.com/shelljs/shelljs/issues/742)
+- Improve coverage for head\(\) [\#741](https://github.com/shelljs/shelljs/issues/741)
+- shelljs is no longer used in PDF.js [\#737](https://github.com/shelljs/shelljs/issues/737)
+- ls doesn't follow links to directories [\#733](https://github.com/shelljs/shelljs/issues/733)
+- Add test for `ls regular-file.txt` [\#732](https://github.com/shelljs/shelljs/issues/732)
+- Clean up common tests [\#714](https://github.com/shelljs/shelljs/issues/714)
+- Cant get encoding buffer to work on exec [\#675](https://github.com/shelljs/shelljs/issues/675)
+- Set up Codecov for the project [\#671](https://github.com/shelljs/shelljs/issues/671)
+- ShellJS: internal error Error: EBUSY: resource busy or locked, lstat 'C:\pagefile.sys' [\#514](https://github.com/shelljs/shelljs/issues/514)
+- Feature request: provide a way to skip option parsing [\#778](https://github.com/shelljs/shelljs/issues/778)
+- Switch to os.homedir\(\) when we move to v4+ [\#683](https://github.com/shelljs/shelljs/issues/683)
+- Drop support for v0.12 [\#647](https://github.com/shelljs/shelljs/issues/647)
+- feature: echo -n [\#559](https://github.com/shelljs/shelljs/issues/559)
+- Don't kill the node process upon unexpected error [\#483](https://github.com/shelljs/shelljs/issues/483)
+- Echo doesn't return value ending in a trailing newline [\#476](https://github.com/shelljs/shelljs/issues/476)
+- Synchronous exec stalls permenantly when there is an error/w the shell [\#7](https://github.com/shelljs/shelljs/issues/7)
+
+**Merged pull requests:**
+
+- docs: announce plugin API [\#812](https://github.com/shelljs/shelljs/pull/812) ([nfischer](https://github.com/nfischer))
+- chore: update CI to Node v9 [\#811](https://github.com/shelljs/shelljs/pull/811) ([nfischer](https://github.com/nfischer))
+- refactor\(exec\): remove paramsFile [\#807](https://github.com/shelljs/shelljs/pull/807) ([nfischer](https://github.com/nfischer))
+- chore: update nyc dependency [\#805](https://github.com/shelljs/shelljs/pull/805) ([nfischer](https://github.com/nfischer))
+- refactor: harden plugins against unknown options [\#804](https://github.com/shelljs/shelljs/pull/804) ([nfischer](https://github.com/nfischer))
+- chore\(eslint\): use words instead of numbers [\#797](https://github.com/shelljs/shelljs/pull/797) ([nfischer](https://github.com/nfischer))
+- Add note to issue template about FAQ [\#794](https://github.com/shelljs/shelljs/pull/794) ([freitagbr](https://github.com/freitagbr))
+- Remove codeFile parameter [\#791](https://github.com/shelljs/shelljs/pull/791) ([nfischer](https://github.com/nfischer))
+- Use execFileSync to launch child process [\#790](https://github.com/shelljs/shelljs/pull/790) ([nfischer](https://github.com/nfischer))
+- refactor\(exec\): move child process to source file [\#786](https://github.com/shelljs/shelljs/pull/786) ([nfischer](https://github.com/nfischer))
+- Remove unnecessary shell.error checks from common tests [\#785](https://github.com/shelljs/shelljs/pull/785) ([freitagbr](https://github.com/freitagbr))
+- Add a test for ls for a single file [\#784](https://github.com/shelljs/shelljs/pull/784) ([freitagbr](https://github.com/freitagbr))
+- Wrap fs.statSync and fs.lstatSync [\#783](https://github.com/shelljs/shelljs/pull/783) ([freitagbr](https://github.com/freitagbr))
+- chore: set AVA options [\#780](https://github.com/shelljs/shelljs/pull/780) ([nfischer](https://github.com/nfischer))
+- chore: clean up refs to unsupported node versions [\#779](https://github.com/shelljs/shelljs/pull/779) ([nfischer](https://github.com/nfischer))
+- Added `-q` \(quiet\) option to `push`, `popd`, `dirs` functions. [\#777](https://github.com/shelljs/shelljs/pull/777) ([alexreg](https://github.com/alexreg))
+- feat\(cat\): number output lines \(\#750\) [\#775](https://github.com/shelljs/shelljs/pull/775) ([gcca](https://github.com/gcca))
+- refactor\(test\): update AVA and refactor tests [\#760](https://github.com/shelljs/shelljs/pull/760) ([nfischer](https://github.com/nfischer))
+- chore: add skipOnWin and skipOnUnix test helpers [\#746](https://github.com/shelljs/shelljs/pull/746) ([nfischer](https://github.com/nfischer))
+- test\(exec\): add tests for coverage [\#744](https://github.com/shelljs/shelljs/pull/744) ([nfischer](https://github.com/nfischer))
+- test\(head\): improve coverage [\#743](https://github.com/shelljs/shelljs/pull/743) ([nfischer](https://github.com/nfischer))
+- Remove PDF.js mention from README.md [\#738](https://github.com/shelljs/shelljs/pull/738) ([voy](https://github.com/voy))
+- Provide an API to pass parameters which resemble options [\#792](https://github.com/shelljs/shelljs/pull/792) ([nfischer](https://github.com/nfischer))
+- Fix ls not following links to directories by default [\#764](https://github.com/shelljs/shelljs/pull/764) ([freitagbr](https://github.com/freitagbr))
+- Add "encoding" option to exec [\#763](https://github.com/shelljs/shelljs/pull/763) ([freitagbr](https://github.com/freitagbr))
+- Merge dev into master [\#731](https://github.com/shelljs/shelljs/pull/731) ([freitagbr](https://github.com/freitagbr))
+- Deprecate common.getUserHome, advise using os.homedir instead [\#725](https://github.com/shelljs/shelljs/pull/725) ([freitagbr](https://github.com/freitagbr))
+- Echo test mocks [\#708](https://github.com/shelljs/shelljs/pull/708) ([freitagbr](https://github.com/freitagbr))
+- Safely exit by throwing an error [\#546](https://github.com/shelljs/shelljs/pull/546) ([freitagbr](https://github.com/freitagbr))
+- chore\(make\): depreciate shelljs/make [\#431](https://github.com/shelljs/shelljs/pull/431) ([ariporad](https://github.com/ariporad))
+
+## [v0.7.8](https://github.com/shelljs/shelljs/tree/v0.7.8) (2017-06-07)
+[Full Changelog](https://github.com/shelljs/shelljs/compare/v0.7.7...v0.7.8)
+
+**Closed issues:**
+
+- Add node v8 to CI [\#729](https://github.com/shelljs/shelljs/issues/729)
+- Exec not working in Electron ! [\#726](https://github.com/shelljs/shelljs/issues/726)
+- is rechoir used anywhere? [\#723](https://github.com/shelljs/shelljs/issues/723)
+- ShellJS: internal error on shelljs.mkdir\('myFile/myDir'\) [\#720](https://github.com/shelljs/shelljs/issues/720)
+- Can't make sed perform global replace [\#719](https://github.com/shelljs/shelljs/issues/719)
+- grep: option not recognized: l [\#717](https://github.com/shelljs/shelljs/issues/717)
+- Problems getting code, stdout, stderr [\#715](https://github.com/shelljs/shelljs/issues/715)
+- Copying hidden files fails on Windows 10 [\#711](https://github.com/shelljs/shelljs/issues/711)
+- How am I suppose to handle errors with ShellJS? [\#707](https://github.com/shelljs/shelljs/issues/707)
+- use cp\('-r', './src', './dist'\) bug [\#705](https://github.com/shelljs/shelljs/issues/705)
+- Way to ignore files in globs. [\#699](https://github.com/shelljs/shelljs/issues/699)
+- Buffer constructor is deprecated [\#694](https://github.com/shelljs/shelljs/issues/694)
+- source command not working via exec method. [\#693](https://github.com/shelljs/shelljs/issues/693)
+- Would you be interested in a PR for `open`? [\#692](https://github.com/shelljs/shelljs/issues/692)
+- Get rid of common.platform in favor of process.platform [\#670](https://github.com/shelljs/shelljs/issues/670)
+- Passing empty string to cp throws internal error [\#664](https://github.com/shelljs/shelljs/issues/664)
+- Why does sed split files into an array, call replace on each line and rejoin? [\#645](https://github.com/shelljs/shelljs/issues/645)
+- feat: cp & mv should not overwrite recently created files [\#631](https://github.com/shelljs/shelljs/issues/631)
+- Echo tests unnecessarily run tests in own process [\#622](https://github.com/shelljs/shelljs/issues/622)
+- rm -rf on a symbolic link to a dir deletes its contents [\#587](https://github.com/shelljs/shelljs/issues/587)
+- "Cannot extract package" with node-webkit [\#181](https://github.com/shelljs/shelljs/issues/181)
+- EBADF, bad file descriptor [\#180](https://github.com/shelljs/shelljs/issues/180)
+
+**Merged pull requests:**
+
+- Add node 8 to CI [\#730](https://github.com/shelljs/shelljs/pull/730) ([freitagbr](https://github.com/freitagbr))
+- fix\(mkdir\): improve error handling around files [\#721](https://github.com/shelljs/shelljs/pull/721) ([nfischer](https://github.com/nfischer))
+- Properly handle directories as arguments [\#713](https://github.com/shelljs/shelljs/pull/713) ([nfischer](https://github.com/nfischer))
+- Add common.buffer [\#710](https://github.com/shelljs/shelljs/pull/710) ([freitagbr](https://github.com/freitagbr))
+- Fix common.expand error [\#709](https://github.com/shelljs/shelljs/pull/709) ([freitagbr](https://github.com/freitagbr))
+- refactor: remove unnecessary common.js imports [\#703](https://github.com/shelljs/shelljs/pull/703) ([nfischer](https://github.com/nfischer))
+- Fix \#631 throw error when overwriting recently created file [\#702](https://github.com/shelljs/shelljs/pull/702) ([uttpal](https://github.com/uttpal))
+- Small clarification of verbose flag [\#691](https://github.com/shelljs/shelljs/pull/691) ([zommerfelds](https://github.com/zommerfelds))
+- fix\(grep, sed, sort, uniq\): Split only on newline characters [\#690](https://github.com/shelljs/shelljs/pull/690) ([freitagbr](https://github.com/freitagbr))
+- Refactor: Use process.platform across codebase [\#689](https://github.com/shelljs/shelljs/pull/689) ([freitagbr](https://github.com/freitagbr))
+- Remove contents of symlink to dir with rm -rf [\#688](https://github.com/shelljs/shelljs/pull/688) ([freitagbr](https://github.com/freitagbr))
+- Echo stdout [\#677](https://github.com/shelljs/shelljs/pull/677) ([nfischer](https://github.com/nfischer))
+
+## [v0.7.7](https://github.com/shelljs/shelljs/tree/v0.7.7) (2017-03-09)
+[Full Changelog](https://github.com/shelljs/shelljs/compare/v0.7.6...v0.7.7)
+
+**Closed issues:**
+
+- Error output should be consistent across all platforms. [\#681](https://github.com/shelljs/shelljs/issues/681)
+- \*CRITICAL data loss\* shell.cp\(\) Content of file is erased when trying to copy it to the folder it already belongs to [\#678](https://github.com/shelljs/shelljs/issues/678)
+- Use with webpack broken in 0.7.6 [\#667](https://github.com/shelljs/shelljs/issues/667)
+- Difference between bash ls -R and ShellJS ls -R with symlinks [\#666](https://github.com/shelljs/shelljs/issues/666)
+- Refactor which\(\) \(too many repeated code blocks\) [\#656](https://github.com/shelljs/shelljs/issues/656)
+- find\(\) raises error when unable to find any files matching, expected to return empty array. [\#653](https://github.com/shelljs/shelljs/issues/653)
+- Reformat the markdown in RELEASE.md [\#642](https://github.com/shelljs/shelljs/issues/642)
+- rm -rf doesn't work if the directory contains an asar archive in Electron [\#618](https://github.com/shelljs/shelljs/issues/618)
+- Add support for other file types in rm [\#617](https://github.com/shelljs/shelljs/issues/617)
+- Feature request: ls -L option [\#563](https://github.com/shelljs/shelljs/issues/563)
+- How to send SIGINT signal to child process launched with exec [\#518](https://github.com/shelljs/shelljs/issues/518)
+- feature request: option to add node\_modules to the path for shelljs scripts [\#469](https://github.com/shelljs/shelljs/issues/469)
+- high cpu usage during synchronous exec [\#167](https://github.com/shelljs/shelljs/issues/167)
+
+**Merged pull requests:**
+
+- Add support for removing fifos [\#687](https://github.com/shelljs/shelljs/pull/687) ([freitagbr](https://github.com/freitagbr))
+- chore: add codecov script to appveyor CI [\#686](https://github.com/shelljs/shelljs/pull/686) ([nfischer](https://github.com/nfischer))
+- Refactor tests to improve readability [\#685](https://github.com/shelljs/shelljs/pull/685) ([nfischer](https://github.com/nfischer))
+- fix: convert error output to be consistent cross-platform [\#684](https://github.com/shelljs/shelljs/pull/684) ([nfischer](https://github.com/nfischer))
+- chore: add codecov [\#682](https://github.com/shelljs/shelljs/pull/682) ([nfischer](https://github.com/nfischer))
+- Fix cp overwriting identical files [\#679](https://github.com/shelljs/shelljs/pull/679) ([freitagbr](https://github.com/freitagbr))
+- Modified glob pattern. Fixes \#666 [\#676](https://github.com/shelljs/shelljs/pull/676) ([frandiox](https://github.com/frandiox))
+- refactor\(parseOptions\): better handle errors [\#674](https://github.com/shelljs/shelljs/pull/674) ([nfischer](https://github.com/nfischer))
+- test: add misc. tests to improve coverage [\#673](https://github.com/shelljs/shelljs/pull/673) ([nfischer](https://github.com/nfischer))
+- test: don't count hard-to-test lines for coverage [\#672](https://github.com/shelljs/shelljs/pull/672) ([nfischer](https://github.com/nfischer))
+- fix: switch commands.json -\> commands.js [\#668](https://github.com/shelljs/shelljs/pull/668) ([nfischer](https://github.com/nfischer))
+- ls -L \(follow symlinks\) [\#665](https://github.com/shelljs/shelljs/pull/665) ([frandiox](https://github.com/frandiox))
+- docs\(chmod\): document `options` argument [\#663](https://github.com/shelljs/shelljs/pull/663) ([gkalpak](https://github.com/gkalpak))
+- docs: clean up RELEASE.md [\#662](https://github.com/shelljs/shelljs/pull/662) ([nfischer](https://github.com/nfischer))
+- docs: miscellaneous README changes [\#661](https://github.com/shelljs/shelljs/pull/661) ([nfischer](https://github.com/nfischer))
+- Fix typo in README [\#660](https://github.com/shelljs/shelljs/pull/660) ([faheel](https://github.com/faheel))
+- refactor: reduce repeated code in which\(\) [\#659](https://github.com/shelljs/shelljs/pull/659) ([nfischer](https://github.com/nfischer))
+- feature: add -a option for which command [\#655](https://github.com/shelljs/shelljs/pull/655) ([termosa](https://github.com/termosa))
+- Fix find ENOENT [\#654](https://github.com/shelljs/shelljs/pull/654) ([freitagbr](https://github.com/freitagbr))
+- Safely exit by throwing an error [\#649](https://github.com/shelljs/shelljs/pull/649) ([freitagbr](https://github.com/freitagbr))
+- Chore drop 0.12 [\#648](https://github.com/shelljs/shelljs/pull/648) ([nfischer](https://github.com/nfischer))
+- chore\(lint\): Enforce a trailing comma for multi-line [\#646](https://github.com/shelljs/shelljs/pull/646) ([nfischer](https://github.com/nfischer))
+- docs\(release\): use bulleted list [\#643](https://github.com/shelljs/shelljs/pull/643) ([freitagbr](https://github.com/freitagbr))
+
 ## [v0.7.6](https://github.com/shelljs/shelljs/tree/v0.7.6) (2017-01-08)
 [Full Changelog](https://github.com/shelljs/shelljs/compare/v0.7.5...v0.7.6)
 
@@ -21,21 +276,18 @@
 - write to file [\#568](https://github.com/shelljs/shelljs/issues/568)
 - Cannot figure out how to disable globbing for rm [\#567](https://github.com/shelljs/shelljs/issues/567)
 - Switch to the ava test framework [\#560](https://github.com/shelljs/shelljs/issues/560)
-- feature: echo -n [\#559](https://github.com/shelljs/shelljs/issues/559)
 - Option not recognized [\#556](https://github.com/shelljs/shelljs/issues/556)
 - chore: add @freitagbr to LGTM maintainers [\#552](https://github.com/shelljs/shelljs/issues/552)
 - chore: set up dev branch [\#548](https://github.com/shelljs/shelljs/issues/548)
 - bug: cp\(\) doesn't always copy everything [\#547](https://github.com/shelljs/shelljs/issues/547)
 - User-friendly lint command [\#544](https://github.com/shelljs/shelljs/issues/544)
 - Lint warning [\#542](https://github.com/shelljs/shelljs/issues/542)
-- Possible Regression: cp from 0.6.0 to 0.7.x version [\#538](https://github.com/shelljs/shelljs/issues/538)
 - chore: add nodejs v7 to CI [\#537](https://github.com/shelljs/shelljs/issues/537)
 - error.code is not always available [\#536](https://github.com/shelljs/shelljs/issues/536)
 - Add shx as a dependency for testing [\#525](https://github.com/shelljs/shelljs/issues/525)
 - Feature request: allow `common.error\(\)` to optionally not insert a prefix and optionally not print to console [\#523](https://github.com/shelljs/shelljs/issues/523)
 - Feature request: Add "shelljs.unlink" [\#519](https://github.com/shelljs/shelljs/issues/519)
 - Sed should allow a replacement string to contain `\1` for match groups [\#507](https://github.com/shelljs/shelljs/issues/507)
-- Don't kill the node process upon unexpected error [\#483](https://github.com/shelljs/shelljs/issues/483)
 - Usage with neodoc [\#445](https://github.com/shelljs/shelljs/issues/445)
 - \[ Feature idea \] synchronous sleep command [\#441](https://github.com/shelljs/shelljs/issues/441)
 - Improve test coverage [\#347](https://github.com/shelljs/shelljs/issues/347)
@@ -105,7 +357,6 @@
 - Add Brandon Freitag to maintainers/contributors [\#553](https://github.com/shelljs/shelljs/pull/553) ([freitagbr](https://github.com/freitagbr))
 - Get pipe tests running on Windows. [\#550](https://github.com/shelljs/shelljs/pull/550) ([binki](https://github.com/binki))
 - fix: maxdepth doesn't limit total number of copies [\#549](https://github.com/shelljs/shelljs/pull/549) ([nfischer](https://github.com/nfischer))
-- Safely exit by throwing an error [\#546](https://github.com/shelljs/shelljs/pull/546) ([freitagbr](https://github.com/freitagbr))
 - Fix lint warning [\#543](https://github.com/shelljs/shelljs/pull/543) ([freitagbr](https://github.com/freitagbr))
 - chore: remove v0.10 from Travis CI [\#540](https://github.com/shelljs/shelljs/pull/540) ([nfischer](https://github.com/nfischer))
 - chore: add Node v7 for CI [\#539](https://github.com/shelljs/shelljs/pull/539) ([nfischer](https://github.com/nfischer))
@@ -126,7 +377,6 @@
 - ShellJS in Electron package don't find ffmpeg anymore [\#516](https://github.com/shelljs/shelljs/issues/516)
 - Exec issues with string option introduced in 0.7.4 [\#515](https://github.com/shelljs/shelljs/issues/515)
 - \[ Feature \] SSH command [\#435](https://github.com/shelljs/shelljs/issues/435)
-- Synchronous exec stalls permenantly when there is an error/w the shell [\#7](https://github.com/shelljs/shelljs/issues/7)
 
 **Merged pull requests:**
 
@@ -206,7 +456,6 @@
 - Stdout is empty on Git log command [\#439](https://github.com/shelljs/shelljs/issues/439)
 - Cannot read toString of null when using execSync [\#415](https://github.com/shelljs/shelljs/issues/415)
 - cp -R dir/ target fails to copy hidden files in dir [\#140](https://github.com/shelljs/shelljs/issues/140)
-- Adding callback to basic commands [\#102](https://github.com/shelljs/shelljs/issues/102)
 - \#mv Won't Work Across Disks [\#1](https://github.com/shelljs/shelljs/issues/1)
 
 **Merged pull requests:**
@@ -228,7 +477,6 @@
 - docs: comment code better to help contributors [\#437](https://github.com/shelljs/shelljs/pull/437) ([nfischer](https://github.com/nfischer))
 - chore\(CI\): update appveyor [\#436](https://github.com/shelljs/shelljs/pull/436) ([nfischer](https://github.com/nfischer))
 - chore: test against node v6 [\#433](https://github.com/shelljs/shelljs/pull/433) ([nfischer](https://github.com/nfischer))
-- chore\(make\): depreciate shelljs/make [\#431](https://github.com/shelljs/shelljs/pull/431) ([ariporad](https://github.com/ariporad))
 - docs: warn that README contains newest features [\#410](https://github.com/shelljs/shelljs/pull/410) ([nfischer](https://github.com/nfischer))
 
 ## [v0.7.0](https://github.com/shelljs/shelljs/tree/v0.7.0) (2016-04-25)
@@ -237,8 +485,6 @@
 **Closed issues:**
 
 - exec\('nohup node some.js &'\) [\#426](https://github.com/shelljs/shelljs/issues/426)
-- cp copy to symlinked folder [\#414](https://github.com/shelljs/shelljs/issues/414)
-- Invalid version number \(0.0.1alpha1\) [\#399](https://github.com/shelljs/shelljs/issues/399)
 - shelljs Breaks SemVer for Alpha and Pre-Release Versions [\#390](https://github.com/shelljs/shelljs/issues/390)
 - Copy not accepting source end with wildcards \* when using -r on v0.6.0 [\#389](https://github.com/shelljs/shelljs/issues/389)
 - Support globbing in `shjs` [\#388](https://github.com/shelljs/shelljs/issues/388)
@@ -257,7 +503,6 @@
 - "exec" causes LiveScript interpreter \(lsc\) to hang [\#160](https://github.com/shelljs/shelljs/issues/160)
 - Don't modify string prototype [\#159](https://github.com/shelljs/shelljs/issues/159)
 - `exec\(...\).to\(file\)` should work [\#154](https://github.com/shelljs/shelljs/issues/154)
-- Would like to see more async variants for cp/rm etc [\#144](https://github.com/shelljs/shelljs/issues/144)
 - Can't install shelljs locally instead of globally [\#136](https://github.com/shelljs/shelljs/issues/136)
 - shelljs and node 0.10.28 [\#125](https://github.com/shelljs/shelljs/issues/125)
 - Use case for global installed shelljs [\#123](https://github.com/shelljs/shelljs/issues/123)
@@ -361,7 +606,6 @@
 - sed\(\) should accept multiple file arguments [\#231](https://github.com/shelljs/shelljs/issues/231)
 - shelljs.exec\('aaa && bbb'\) blocks [\#229](https://github.com/shelljs/shelljs/issues/229)
 - Consider creating a GitHub Organization with more maintainers [\#223](https://github.com/shelljs/shelljs/issues/223)
-- Doesn't work inside Electron [\#220](https://github.com/shelljs/shelljs/issues/220)
 - \[idea\] Add chmodr function. [\#219](https://github.com/shelljs/shelljs/issues/219)
 - Execute a file [\#211](https://github.com/shelljs/shelljs/issues/211)
 - Where is standard error going to? [\#209](https://github.com/shelljs/shelljs/issues/209)
@@ -373,7 +617,6 @@
 - Cannot recursively list all \*.js files [\#162](https://github.com/shelljs/shelljs/issues/162)
 - exec\(\) breaks if executed in a deleted directory [\#157](https://github.com/shelljs/shelljs/issues/157)
 - shjs command always exits with zero code [\#133](https://github.com/shelljs/shelljs/issues/133)
-- Windows failing tests [\#127](https://github.com/shelljs/shelljs/issues/127)
 - touch command [\#122](https://github.com/shelljs/shelljs/issues/122)
 - Symbolic links are broken! [\#100](https://github.com/shelljs/shelljs/issues/100)
 - interpret `--` as stdin [\#55](https://github.com/shelljs/shelljs/issues/55)
@@ -487,7 +730,7 @@
 
 - Breaking: Allow -- as args separators \(fixes \#188\) [\#207](https://github.com/shelljs/shelljs/pull/207) ([nzakas](https://github.com/nzakas))
 - Update .travis.yml [\#190](https://github.com/shelljs/shelljs/pull/190) ([arturadib](https://github.com/arturadib))
-- Use new child\_process.execSync instead of busywaiting [\#189](https://github.com/shelljs/shelljs/pull/189) ([devTristan](https://github.com/devTristan))
+- Use new child\_process.execSync instead of busywaiting [\#189](https://github.com/shelljs/shelljs/pull/189) ([madd512](https://github.com/madd512))
 - Update README.md: explains how to access "config" [\#145](https://github.com/shelljs/shelljs/pull/145) ([kerphi](https://github.com/kerphi))
 - Fix to set state.error before throw the exception [\#120](https://github.com/shelljs/shelljs/pull/120) ([abdul-martinez](https://github.com/abdul-martinez))
 - Add -l and -s support to grep. [\#116](https://github.com/shelljs/shelljs/pull/116) ([idearat](https://github.com/idearat))
@@ -553,8 +796,8 @@
 
 **Merged pull requests:**
 
-- Addition of a toEnd\(\) function modeled after the Unix \>\> pipe. [\#78](https://github.com/shelljs/shelljs/pull/78) ([andreweduffy](https://github.com/andreweduffy))
-- Added appendTo\(\) function to imitate '\>\>' redirect-and-append pipe. [\#75](https://github.com/shelljs/shelljs/pull/75) ([andreweduffy](https://github.com/andreweduffy))
+- Addition of a toEnd\(\) function modeled after the Unix \>\> pipe. [\#78](https://github.com/shelljs/shelljs/pull/78) ([a10y](https://github.com/a10y))
+- Added appendTo\(\) function to imitate '\>\>' redirect-and-append pipe. [\#75](https://github.com/shelljs/shelljs/pull/75) ([a10y](https://github.com/a10y))
 - Fix a small typo in README.md [\#71](https://github.com/shelljs/shelljs/pull/71) ([asmblah](https://github.com/asmblah))
 - adding an `.npmignore` file [\#70](https://github.com/shelljs/shelljs/pull/70) ([stephenmathieson](https://github.com/stephenmathieson))
 - tempdir: use `os.tmpDir` when possible [\#67](https://github.com/shelljs/shelljs/pull/67) ([stephenmathieson](https://github.com/stephenmathieson))
@@ -705,4 +948,4 @@
 ## [v0.0.2pre1](https://github.com/shelljs/shelljs/tree/v0.0.2pre1) (2012-03-03)
 
 
-\* *This Change Log was automatically generated by [github_changelog_generator](https://github.com/skywinder/Github-Changelog-Generator)*
\ No newline at end of file
+\* *This Change Log was automatically generated by [github_changelog_generator](https://github.com/skywinder/Github-Changelog-Generator)*
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 16257e158..1559b4d77 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -5,22 +5,21 @@
 We love to receive bug reports (we're always trying to make ShellJS more
 stable). If you've found a bug, please follow these steps:
 
- - Search for any issues that may have been created already. We often receive
-   duplicates, and cutting down on this is helpful. If someone else has already
-   reported it, please ping that issue thread.
- - Let us know your version of NodeJS (`node -v`), your version of ShellJS (from
-   `package.json`), your OS, and any other useful information.
- - Give an example ShellJS command to reproduce the error.
+ - Please try to cut down on duplicates. Please search for issues which have
+   already been reported (remember to search closed issues).
+ - Please see [`ISSUE_TEMPLATE.md`](.github/ISSUE_TEMPLATE.md) for more
+   information.
 
 ## Pull requests
 
 PRs are welcome! However, we ask that you follow a few guidelines:
 
  - Please add tests for all changes/new features.
- - Make sure your code passes `npm test`. Please check the CI (both Appveyor and
-   Travis). If you can't figure out why something doesn't work, feel free to ask
-   for help.
- - Make changes to the documentation *within the source files*, not in the
-   README. Then update the README by running `node scripts/generate-docs.js`.
+ - Make sure your code passes `npm test`. Please check the CI. If you can't
+   figure out why something doesn't work, feel free to ask for help.
+ - Make sure you conform to our style guidelines. You can run `npm run lint` to
+   check style, and `npm run lint -- --fix` to automatically fix some issues.
+ - Make documentation changes *within the source files*, not in the README.
+   Update the README with `npm run gendocs`.
  - Please keep your PR up to date (either via rebase or by pressing the "update
    branch" button on Github).
diff --git a/LICENSE b/LICENSE
index 0f0f119be..40a2bf650 100644
--- a/LICENSE
+++ b/LICENSE
@@ -1,26 +1,29 @@
+BSD 3-Clause License
+
 Copyright (c) 2012, Artur Adib <arturadib@gmail.com>
 All rights reserved.
 
-You may use this project under the terms of the New BSD license as follows:
-
 Redistribution and use in source and binary forms, with or without
 modification, are permitted provided that the following conditions are met:
-    * Redistributions of source code must retain the above copyright
-      notice, this list of conditions and the following disclaimer.
-    * Redistributions in binary form must reproduce the above copyright
-      notice, this list of conditions and the following disclaimer in the
-      documentation and/or other materials provided with the distribution.
-    * Neither the name of Artur Adib nor the
-      names of the contributors may be used to endorse or promote products
-      derived from this software without specific prior written permission.
 
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 
-AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
-IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 
-ARE DISCLAIMED. IN NO EVENT SHALL ARTUR ADIB BE LIABLE FOR ANY
-DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
-(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
-LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
-ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 
-THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+* Redistributions of source code must retain the above copyright notice, this
+  list of conditions and the following disclaimer.
+
+* Redistributions in binary form must reproduce the above copyright notice,
+  this list of conditions and the following disclaimer in the documentation
+  and/or other materials provided with the distribution.
+
+* Neither the name of the copyright holder nor the names of its
+  contributors may be used to endorse or promote products derived from
+  this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
diff --git a/README.md b/README.md
index cf5a0dd77..a0de67655 100644
--- a/README.md
+++ b/README.md
@@ -1,33 +1,32 @@
 # ShellJS - Unix shell commands for Node.js
 
-[![Gitter](https://img.shields.io/gitter/room/nwjs/nw.js.svg?style=flat-square)](https://gitter.im/shelljs/shelljs?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
-[![Travis](https://img.shields.io/travis/shelljs/shelljs/master.svg?style=flat-square&label=unix)](https://travis-ci.org/shelljs/shelljs)
-[![AppVeyor](https://img.shields.io/appveyor/ci/shelljs/shelljs/master.svg?style=flat-square&label=windows)](https://ci.appveyor.com/project/shelljs/shelljs/branch/master)
+[![GitHub Actions](https://img.shields.io/github/actions/workflow/status/shelljs/shelljs/main.yml?style=flat-square&logo=github)](https://github.com/shelljs/shelljs/actions/workflows/main.yml)
+[![Codecov](https://img.shields.io/codecov/c/github/shelljs/shelljs/main.svg?style=flat-square&label=coverage)](https://codecov.io/gh/shelljs/shelljs)
 [![npm version](https://img.shields.io/npm/v/shelljs.svg?style=flat-square)](https://www.npmjs.com/package/shelljs)
 [![npm downloads](https://img.shields.io/npm/dm/shelljs.svg?style=flat-square)](https://www.npmjs.com/package/shelljs)
 
-ShellJS is a portable **(Windows/Linux/OS X)** implementation of Unix shell commands on top of the
-Node.js API. You can use it to eliminate your shell script's dependency on Unix while still keeping
-its familiar and powerful commands. You can also install it globally so you can run it from outside
-Node projects - say goodbye to those gnarly Bash scripts!
+ShellJS is a portable **(Windows/Linux/macOS)** implementation of Unix shell
+commands on top of the Node.js API. You can use it to eliminate your shell
+script's dependency on Unix while still keeping its familiar and powerful
+commands. You can also install it globally so you can run it from outside Node
+projects - say goodbye to those gnarly Bash scripts!
 
-ShellJS is proudly tested on every node release since `v0.11`!
+ShellJS is proudly tested on every LTS node release since <!-- start minVersion -->`v18`<!-- stop minVersion -->!
 
-The project is [unit-tested](http://travis-ci.org/shelljs/shelljs) and battled-tested in projects like:
+The project is unit-tested and battle-tested in projects like:
 
-+ [PDF.js](http://github.com/mozilla/pdf.js) - Firefox's next-gen PDF reader
 + [Firebug](http://getfirebug.com/) - Firefox's infamous debugger
-+ [JSHint](http://jshint.com) - Most popular JavaScript linter
++ [JSHint](http://jshint.com) & [ESLint](http://eslint.org/) - popular JavaScript linters
 + [Zepto](http://zeptojs.com) - jQuery-compatible JavaScript library for modern browsers
 + [Yeoman](http://yeoman.io/) - Web application stack and development tool
 + [Deployd.com](http://deployd.com) - Open source PaaS for quick API backend generation
 + And [many more](https://npmjs.org/browse/depended/shelljs).
 
-If you have feedback, suggestions, or need help, feel free to post in our [issue tracker](https://github.com/shelljs/shelljs/issues).
+If you have feedback, suggestions, or need help, feel free to post in our [issue
+tracker](https://github.com/shelljs/shelljs/issues).
 
-Think ShellJS is cool? Check out some related projects (like
-[cash](https://github.com/dthree/cash)--a javascript-based POSIX shell)
-in our [Wiki page](https://github.com/shelljs/shelljs/wiki)!
+Think ShellJS is cool? Check out some related projects in our [Wiki
+page](https://github.com/shelljs/shelljs/wiki)!
 
 Upgrading from an older version? Check out our [breaking
 changes](https://github.com/shelljs/shelljs/wiki/Breaking-Changes) page to see
@@ -47,13 +46,18 @@ $ shx touch foo/bar.txt
 $ shx rm -rf foo
 ```
 
+## Plugin API
+
+ShellJS now supports third-party plugins! You can learn more about using plugins
+and writing your own ShellJS commands in [the
+wiki](https://github.com/shelljs/shelljs/wiki/Using-ShellJS-Plugins).
+
 ## A quick note about the docs
 
 For documentation on all the latest features, check out our
 [README](https://github.com/shelljs/shelljs). To read docs that are consistent
 with the latest release, check out [the npm
-page](https://www.npmjs.com/package/shelljs) or
-[shelljs.org](http://documentup.com/shelljs/shelljs).
+page](https://www.npmjs.com/package/shelljs).
 
 ## Installing
 
@@ -63,85 +67,66 @@ Via npm:
 $ npm install [-g] shelljs
 ```
 
-If the global option `-g` is specified, the binary `shjs` will be installed. This makes it possible to
-run ShellJS scripts much like any shell script from the command line, i.e. without requiring a `node_modules` folder:
-
-```bash
-$ shjs my_script
-```
-
 ## Examples
 
-### JavaScript
-
 ```javascript
-require('shelljs/global');
+var shell = require('shelljs');
 
-if (!which('git')) {
-  echo('Sorry, this script requires git');
-  exit(1);
+if (!shell.which('git')) {
+  shell.echo('Sorry, this script requires git');
+  shell.exit(1);
 }
 
 // Copy files to release dir
-rm('-rf', 'out/Release');
-cp('-R', 'stuff/', 'out/Release');
+shell.rm('-rf', 'out/Release');
+shell.cp('-R', 'stuff/', 'out/Release');
 
 // Replace macros in each .js file
-cd('lib');
-ls('*.js').forEach(function(file) {
-  sed('-i', 'BUILD_VERSION', 'v0.1.2', file);
-  sed('-i', /^.*REMOVE_THIS_LINE.*$/, '', file);
-  sed('-i', /.*REPLACE_LINE_WITH_MACRO.*\n/, cat('macro.js'), file);
+shell.cd('lib');
+shell.ls('*.js').forEach(function (file) {
+  shell.sed('-i', 'BUILD_VERSION', 'v0.1.2', file);
+  shell.sed('-i', /^.*REMOVE_THIS_LINE.*$/, '', file);
+  shell.sed('-i', /.*REPLACE_LINE_WITH_MACRO.*\n/, shell.cat('macro.js'), file);
 });
-cd('..');
+shell.cd('..');
 
 // Run external tool synchronously
-if (exec('git commit -am "Auto-commit"').code !== 0) {
-  echo('Error: Git commit failed');
-  exit(1);
+if (shell.exec('git commit -am "Auto-commit"').code !== 0) {
+  shell.echo('Error: Git commit failed');
+  shell.exit(1);
 }
 ```
 
-### CoffeeScript
+## Exclude options
 
-CoffeeScript is also supported automatically:
+If you need to pass a parameter that looks like an option, you can do so like:
 
-```coffeescript
-require 'shelljs/global'
+```js
+shell.grep('--', '-v', 'path/to/file'); // Search for "-v", no grep options
 
-if not which 'git'
-  echo 'Sorry, this script requires git'
-  exit 1
-
-# Copy files to release dir
-rm '-rf', 'out/Release'
-cp '-R', 'stuff/', 'out/Release'
-
-# Replace macros in each .js file
-cd 'lib'
-for file in ls '*.js'
-  sed '-i', 'BUILD_VERSION', 'v0.1.2', file
-  sed '-i', /^.*REMOVE_THIS_LINE.*$/, '', file
-  sed '-i', /.*REPLACE_LINE_WITH_MACRO.*\n/, cat('macro.js'), file
-cd '..'
-
-# Run external tool synchronously
-if (exec 'git commit -am "Auto-commit"').code != 0
-  echo 'Error: Git commit failed'
-  exit 1
+shell.cp('-R', '-dir', 'outdir'); // If already using an option, you're done
 ```
 
 ## Global vs. Local
 
-The example above uses the convenience script `shelljs/global` to reduce verbosity. If polluting your global namespace is not desirable, simply require `shelljs`.
+We no longer recommend using a global-import for ShellJS (i.e.
+`require('shelljs/global')`). While still supported for convenience, this
+pollutes the global namespace, and should therefore only be used with caution.
 
-Example:
+Instead, we recommend a local import (standard for npm packages):
 
 ```javascript
 var shell = require('shelljs');
 shell.echo('hello world');
 ```
 
+Alternatively, we also support importing as a module with:
+
+```javascript
+import shell from 'shelljs';
+shell.echo('hello world');
+```
+
 <!-- DO NOT MODIFY BEYOND THIS POINT - IT'S AUTOMATICALLY GENERATED -->
 
 
@@ -150,14 +135,18 @@ shell.echo('hello world');
 
 All commands run synchronously, unless otherwise stated.
 All commands accept standard bash globbing characters (`*`, `?`, etc.),
-compatible with the [node glob module](https://github.com/isaacs/node-glob).
+compatible with [`fast-glob`](https://www.npmjs.com/package/fast-glob).
 
 For less-commonly used commands and features, please check out our [wiki
 page](https://github.com/shelljs/shelljs/wiki).
 
 
-### cat(file [, file ...])
-### cat(file_array)
+### cat([options,] file [, file ...])
+### cat([options,] file_array)
+
+Available options:
+
++ `-n`: number all output lines
 
 Examples:
 
@@ -167,23 +156,25 @@ var str = cat('file1', 'file2');
 var str = cat(['file1', 'file2']); // same as above
 ```
 
-Returns a string containing the given file, or a concatenated string
-containing the files if more than one file is given (a new line character is
-introduced between each file).
+Returns a [ShellString](#shellstringstr) containing the given file, or a
+concatenated string containing the files if more than one file is given (a
+new line character is introduced between each file).
 
 
 ### cd([dir])
+
 Changes to directory `dir` for the duration of the script. Changes to home
-directory if no argument is supplied.
+directory if no argument is supplied. Returns a
+[ShellString](#shellstringstr) to indicate success or failure.
 
 
-### chmod(octal_mode || octal_string, file)
-### chmod(symbolic_mode, file)
+### chmod([options,] octal_mode || octal_string, file)
+### chmod([options,] symbolic_mode, file)
 
 Available options:
 
 + `-v`: output a diagnostic for every file processed
-+ `-c`: like verbose but report only when a change is made
++ `-c`: like verbose, but report only when a change is made
 + `-R`: change files and directories recursively
 
 Examples:
@@ -192,6 +183,7 @@ Examples:
 chmod(755, '/Users/brandon');
 chmod('755', '/Users/brandon'); // same as above
 chmod('u+x', '/Users/brandon');
+chmod('-R', 'a-w', '/Users/brandon');
 ```
 
 Alters the permissions of a file or directory by either specifying the
@@ -199,21 +191,64 @@ absolute permissions in octal form or expressing the changes in symbols.
 This command tries to mimic the POSIX behavior as much as possible.
 Notable exceptions:
 
-+ In symbolic modes, 'a-r' and '-r' are identical.  No consideration is
-  given to the umask.
-+ There is no "quiet" option since default behavior is to run silent.
++ In symbolic modes, `a-r` and `-r` are identical.  No consideration is
+  given to the `umask`.
++ There is no "quiet" option, since default behavior is to run silent.
++ Windows OS uses a very different permission model than POSIX. `chmod()`
+  does its best on Windows, but there are limits to how file permissions can
+  be set. Note that WSL (Windows subsystem for Linux) **does** follow POSIX,
+  so cross-platform compatibility should not be a concern there.
+
+Returns a [ShellString](#shellstringstr) indicating success or failure.
+
+
+### cmd(arg1[, arg2, ...] [, options])
+
+Available options:
+
++ `cwd: directoryPath`: change the current working directory only for this
+  cmd() invocation.
++ `maxBuffer: num`: Raise or decrease the default buffer size for
+  stdout/stderr.
++ `timeout`: Change the default timeout.
+
+Examples:
+
+```javascript
+var version = cmd('node', '--version').stdout;
+cmd('git', 'commit', '-am', `Add suport for node ${version}`);
+console.log(cmd('echo', '1st arg', '2nd arg', '3rd arg').stdout)
+console.log(cmd('echo', 'this handles ;, |, &, etc. as literal characters').stdout)
+```
+
+Executes the given command synchronously. This is intended as an easier
+alternative for [exec()](#execcommand--options--callback), with better
+security around globbing, comamnd injection, and variable expansion. This is
+guaranteed to only run one external command, and won't give special
+treatment for any shell characters (ex. this treats `|` as a literal
+character, not as a shell pipeline).
+This returns a [ShellString](#shellstringstr).
+
+By default, this performs globbing on all platforms, but you can disable
+this with `set('-f')`.
+
+This **does not** support asynchronous mode. If you need asynchronous
+command execution, check out [execa](https://www.npmjs.com/package/execa) or
+the node builtin `child_process.execFile()` instead.
 
 
 ### cp([options,] source [, source ...], dest)
 ### cp([options,] source_array, dest)
+
 Available options:
 
 + `-f`: force (default behavior)
 + `-n`: no-clobber
-+ `-u`: only copy if source is newer than dest
++ `-u`: only copy if `source` is newer than `dest`
 + `-r`, `-R`: recursive
 + `-L`: follow symlinks
 + `-P`: don't follow symlinks
++ `-p`: preserve file mode, ownership, and timestamps
 
 Examples:
 
@@ -224,7 +259,8 @@ cp('-Rf', '/tmp/*', '/usr/local/*', '/home/tmp');
 cp('-Rf', ['/tmp/*', '/usr/local/*'], '/home/tmp'); // same as above
 ```
 
-Copies files.
+Copies files. Returns a [ShellString](#shellstringstr) indicating success
+or failure.
 
 
 ### pushd([options,] [dir | '-N' | '+N'])
@@ -232,10 +268,11 @@ Copies files.
 Available options:
 
 + `-n`: Suppresses the normal change of directory when adding directories to the stack, so that only the stack is manipulated.
++ `-q`: Suppresses output to the console.
 
 Arguments:
 
-+ `dir`: Makes the current working directory be the top of the stack, and then executes the equivalent of `cd dir`.
++ `dir`: Sets the current working directory to the top of the stack, then executes the equivalent of `cd dir`.
 + `+N`: Brings the Nth directory (counting from the left of the list printed by dirs, starting with zero) to the top of the list by rotating the stack.
 + `-N`: Brings the Nth directory (counting from the right of the list printed by dirs, starting with zero) to the top of the list by rotating the stack.
 
@@ -247,13 +284,15 @@ pushd('/etc'); // Returns /etc /usr
 pushd('+1');   // Returns /usr /etc
 ```
 
-Save the current directory on the top of the directory stack and then cd to `dir`. With no arguments, pushd exchanges the top two directories. Returns an array of paths in the stack.
+Save the current directory on the top of the directory stack and then `cd` to `dir`. With no arguments, `pushd` exchanges the top two directories. Returns an array of paths in the stack.
+
 
 ### popd([options,] ['-N' | '+N'])
 
 Available options:
 
-+ `-n`: Suppresses the normal change of directory when removing directories from the stack, so that only the stack is manipulated.
++ `-n`: Suppress the normal directory change when removing directories from the stack, so that only the stack is manipulated.
++ `-q`: Suppresses output to the console.
 
 Arguments:
 
@@ -270,48 +309,56 @@ popd();              // '/usr'
 echo(process.cwd()); // '/usr'
 ```
 
-When no arguments are given, popd removes the top directory from the stack and performs a cd to the new top directory. The elements are numbered from 0 starting at the first directory listed with dirs; i.e., popd is equivalent to popd +0. Returns an array of paths in the stack.
+When no arguments are given, `popd` removes the top directory from the stack and performs a `cd` to the new top directory. The elements are numbered from 0, starting at the first directory listed with dirs (i.e., `popd` is equivalent to `popd +0`). Returns an array of paths in the stack.
+
 
 ### dirs([options | '+N' | '-N'])
 
 Available options:
 
 + `-c`: Clears the directory stack by deleting all of the elements.
++ `-q`: Suppresses output to the console.
 
 Arguments:
 
 + `+N`: Displays the Nth directory (counting from the left of the list printed by dirs when invoked without options), starting with zero.
 + `-N`: Displays the Nth directory (counting from the right of the list printed by dirs when invoked without options), starting with zero.
 
-Display the list of currently remembered directories. Returns an array of paths in the stack, or a single path if +N or -N was specified.
+Display the list of currently remembered directories. Returns an array of paths in the stack, or a single path if `+N` or `-N` was specified.
 
-See also: pushd, popd
+See also: `pushd`, `popd`
 
 
 ### echo([options,] string [, string ...])
+
 Available options:
 
 + `-e`: interpret backslash escapes (default)
++ `-n`: remove trailing newline from output
 
 Examples:
 
 ```javascript
 echo('hello world');
 var str = echo('hello world');
+echo('-n', 'no newline at end');
 ```
 
-Prints string to stdout, and returns string with additional utility methods
-like `.to()`.
+Prints `string` to stdout, and returns a [ShellString](#shellstringstr).
 
 
 ### exec(command [, options] [, callback])
-Available options (all `false` by default):
+
+Available options:
 
 + `async`: Asynchronous execution. If a callback is provided, it will be set to
-  `true`, regardless of the passed value.
-+ `silent`: Do not echo program output to console.
-+ and any option available to NodeJS's
-  [child_process.exec()](https://nodejs.org/api/child_process.html#child_process_child_process_exec_command_options_callback)
+  `true`, regardless of the passed value (default: `false`).
++ `fatal`: Exit upon error (default: `false`).
++ `silent`: Do not echo program output to console (default: `false`).
++ `encoding`: Character encoding to use. Affects the values returned to stdout and stderr, and
+  what is written to stdout and stderr when not in silent mode (default: `'utf8'`).
++ and any option available to Node.js's
+  [`child_process.exec()`](https://nodejs.org/api/child_process.html#child_process_child_process_exec_command_options_callback)
 
 Examples:
 
@@ -330,22 +377,24 @@ exec('some_long_running_process', function(code, stdout, stderr) {
 });
 ```
 
-Executes the given `command` _synchronously_, unless otherwise specified.  When in synchronous
-mode, this returns a ShellString (compatible with ShellJS v0.6.x, which returns an object
-of the form `{ code:..., stdout:... , stderr:... }`). Otherwise, this returns the child process
-object, and the `callback` gets the arguments `(code, stdout, stderr)`.
+Executes the given `command` _synchronously_, unless otherwise specified.
+When in synchronous mode, this returns a [ShellString](#shellstringstr).
+Otherwise, this returns the child process object, and the `callback`
+receives the arguments `(code, stdout, stderr)`.
 
 Not seeing the behavior you want? `exec()` runs everything through `sh`
 by default (or `cmd.exe` on Windows), which differs from `bash`. If you
 need bash-specific behavior, try out the `{shell: 'path/to/bash'}` option.
 
-**Note:** For long-lived processes, it's best to run `exec()` asynchronously as
-the current synchronous implementation uses a lot of CPU. This should be getting
-fixed soon.
+**Security note:** as `shell.exec()` executes an arbitrary string in the
+system shell, it is **critical** to properly sanitize user input to avoid
+**command injection**. For more context, consult the [Security
+Guidelines](https://github.com/shelljs/shelljs/wiki/Security-guidelines).
 
 
 ### find(path [, path ...])
 ### find(path_array)
+
 Examples:
 
 ```javascript
@@ -354,32 +403,44 @@ find(['src', 'lib']); // same as above
 find('.').filter(function(file) { return file.match(/\.js$/); });
 ```
 
-Returns array of all files (however deep) in the given paths.
+Returns a [ShellString](#shellstringstr) (with array-like properties) of all
+files (however deep) in the given paths.
 
 The main difference from `ls('-R', path)` is that the resulting file names
-include the base directories, e.g. `lib/resources/file1` instead of just `file1`.
+include the base directories (e.g., `lib/resources/file1` instead of just `file1`).
 
 
 ### grep([options,] regex_filter, file [, file ...])
 ### grep([options,] regex_filter, file_array)
+
 Available options:
 
-+ `-v`: Inverse the sense of the regex and print the lines not matching the criteria.
-+ `-l`: Print only filenames of matching files
++ `-v`: Invert `regex_filter` (only print non-matching lines).
++ `-l`: Print only filenames of matching files.
++ `-i`: Ignore case.
++ `-n`: Print line numbers.
++ `-B <num>`: Show `<num>` lines before each result.
++ `-A <num>`: Show `<num>` lines after each result.
++ `-C <num>`: Show `<num>` lines before and after each result. -B and -A override this option.
 
 Examples:
 
 ```javascript
 grep('-v', 'GLOBAL_VARIABLE', '*.js');
 grep('GLOBAL_VARIABLE', '*.js');
+grep('-B', 3, 'GLOBAL_VARIABLE', '*.js');
+grep({ '-B': 3 }, 'GLOBAL_VARIABLE', '*.js');
+grep({ '-B': 3, '-C': 2 }, 'GLOBAL_VARIABLE', '*.js');
 ```
 
-Reads input string from given files and returns a string containing all lines of the
-file that match the given `regex_filter`.
+Reads input string from given files and returns a
+[ShellString](#shellstringstr) containing all lines of the @ file that match
+the given `regex_filter`.
 
 
 ### head([{'-n': \<num\>},] file [, file ...])
 ### head([{'-n': \<num\>},] file_array)
+
 Available options:
 
 + `-n <num>`: Show the first `<num>` lines of the files
@@ -392,10 +453,11 @@ var str = head('file1', 'file2');
 var str = head(['file1', 'file2']); // same as above
 ```
 
-Read the start of a file.
+Read the start of a `file`. Returns a [ShellString](#shellstringstr).
 
 
 ### ln([options,] source, dest)
+
 Available options:
 
 + `-s`: symlink
@@ -408,38 +470,50 @@ ln('file', 'newlink');
 ln('-sf', 'file', 'existing');
 ```
 
-Links source to dest. Use -f to force the link, should dest already exist.
+Links `source` to `dest`. Use `-f` to force the link, should `dest` already
+exist. Returns a [ShellString](#shellstringstr) indicating success or
+failure.
 
 
 ### ls([options,] [path, ...])
 ### ls([options,] path_array)
+
 Available options:
 
 + `-R`: recursive
 + `-A`: all files (include files beginning with `.`, except for `.` and `..`)
++ `-L`: follow symlinks
 + `-d`: list directories themselves, not their contents
-+ `-l`: list objects representing each file, each with fields containing `ls
-        -l` output fields. See
-        [fs.Stats](https://nodejs.org/api/fs.html#fs_class_fs_stats)
-        for more info
++ `-l`: provides more details for each file. Specifically, each file is
+        represented by a structured object with separate fields for file
+        metadata (see
+        [`fs.Stats`](https://nodejs.org/api/fs.html#fs_class_fs_stats)). The
+        return value also overrides `.toString()` to resemble `ls -l`'s
+        output format for human readability, but programmatic usage should
+        depend on the stable object format rather than the `.toString()`
+        representation.
 
 Examples:
 
 ```javascript
 ls('projs/*.js');
+ls('projs/**/*.js'); // Find all js files recursively in projs
 ls('-R', '/users/me', '/tmp');
 ls('-R', ['/users/me', '/tmp']); // same as above
 ls('-l', 'file.txt'); // { name: 'file.txt', mode: 33188, nlink: 1, ...}
 ```
 
-Returns array of files in the given path, or in current directory if no path provided.
+Returns a [ShellString](#shellstringstr) (with array-like properties) of all
+the files in the given `path`, or files in the current directory if no
+`path` is  provided.
 
 
 ### mkdir([options,] dir [, dir ...])
 ### mkdir([options,] dir_array)
+
 Available options:
 
-+ `-p`: full path (will create intermediate dirs if necessary)
++ `-p`: full path (and create intermediate directories, if necessary)
 
 Examples:
 
@@ -448,11 +522,13 @@ mkdir('-p', '/tmp/a/b/c/d', '/tmp/e/f/g');
 mkdir('-p', ['/tmp/a/b/c/d', '/tmp/e/f/g']); // same as above
 ```
 
-Creates directories.
+Creates directories. Returns a [ShellString](#shellstringstr) indicating
+success or failure.
 
 
 ### mv([options ,] source [, source ...], dest')
 ### mv([options ,] source_array, dest')
+
 Available options:
 
 + `-f`: force (default behavior)
@@ -466,15 +542,18 @@ mv('file1', 'file2', 'dir/');
 mv(['file1', 'file2'], 'dir/'); // same as above
 ```
 
-Moves files.
+Moves `source` file(s) to `dest`. Returns a [ShellString](#shellstringstr)
+indicating success or failure.
 
 
 ### pwd()
-Returns the current directory.
+
+Returns the current directory as a [ShellString](#shellstringstr).
 
 
 ### rm([options,] file [, file ...])
 ### rm([options,] file_array)
+
 Available options:
 
 + `-f`: force
@@ -488,24 +567,26 @@ rm('some_file.txt', 'another_file.txt');
 rm(['some_file.txt', 'another_file.txt']); // same as above
 ```
 
-Removes files.
+Removes files. Returns a [ShellString](#shellstringstr) indicating success
+or failure.
 
 
 ### sed([options,] search_regex, replacement, file [, file ...])
 ### sed([options,] search_regex, replacement, file_array)
+
 Available options:
 
-+ `-i`: Replace contents of 'file' in-place. _Note that no backups will be created!_
++ `-i`: Replace contents of `file` in-place. _Note that no backups will be created!_
 
 Examples:
 
 ```javascript
 sed('-i', 'PROGRAM_VERSION', 'v0.1.3', 'source.js');
-sed(/.*DELETE_THIS_LINE.*\n/, '', 'source.js');
 ```
 
-Reads an input string from `files` and performs a JavaScript `replace()` on the input
-using the given search regex and replacement string or function. Returns the new string after replacement.
+Reads an input string from `file`s, line by line, and performs a JavaScript `replace()` on
+each of the lines from the input string using the given `search_regex` and `replacement` string or
+function. Returns the new [ShellString](#shellstringstr) after replacement.
 
 Note:
 
@@ -516,8 +597,13 @@ using the `$n` syntax:
 sed(/(\w+)\s(\w+)/, '$2, $1', 'file.txt');
 ```
 
+Also, like unix `sed`, ShellJS `sed` runs replacements on each line from the input file
+(split by '\n') separately, so `search_regex`es that span more than one line (or include '\n')
+will not match anything and nothing will be replaced.
+
 
 ### set(options)
+
 Available options:
 
 + `+/-e`: exit upon error (`config.fatal`)
@@ -531,14 +617,15 @@ set('-e'); // exit upon first error
 set('+e'); // this undoes a "set('-e')"
 ```
 
-Sets global configuration variables
+Sets global configuration variables.
 
 
 ### sort([options,] file [, file ...])
 ### sort([options,] file_array)
+
 Available options:
 
-+ `-r`: Reverse the result of comparisons
++ `-r`: Reverse the results
 + `-n`: Compare according to numerical value
 
 Examples:
@@ -548,15 +635,17 @@ sort('foo.txt', 'bar.txt');
 sort('-r', 'foo.txt');
 ```
 
-Return the contents of the files, sorted line-by-line. Sorting multiple
-files mixes their content, just like unix sort does.
+Return the contents of the `file`s, sorted line-by-line as a
+[ShellString](#shellstringstr). Sorting multiple files mixes their content
+(just as unix `sort` does).
 
 
 ### tail([{'-n': \<num\>},] file [, file ...])
 ### tail([{'-n': \<num\>},] file_array)
+
 Available options:
 
-+ `-n <num>`: Show the last `<num>` lines of the files
++ `-n <num>`: Show the last `<num>` lines of `file`s
 
 Examples:
 
@@ -566,7 +655,7 @@ var str = tail('file1', 'file2');
 var str = tail(['file1', 'file2']); // same as above
 ```
 
-Read the end of a file.
+Read the end of a `file`. Returns a [ShellString](#shellstringstr).
 
 
 ### tempdir()
@@ -582,6 +671,7 @@ Follows Python's [tempfile algorithm](http://docs.python.org/library/tempfile.ht
 
 
 ### test(expression)
+
 Available expression primaries:
 
 + `'-b', 'path'`: true if path is a block device
@@ -597,10 +687,11 @@ Examples:
 
 ```javascript
 if (test('-d', path)) { /* do something with dir */ };
-if (!test('-f', path)) continue; // skip if it's a regular file
+if (!test('-f', path)) continue; // skip if it's not a regular file
 ```
 
-Evaluates expression using the available primaries and returns corresponding value.
+Evaluates `expression` using the available primaries and returns
+corresponding boolean value.
 
 
 ### ShellString.prototype.to(file)
@@ -612,8 +703,9 @@ cat('input.txt').to('output.txt');
 ```
 
 Analogous to the redirection operator `>` in Unix, but works with
-ShellStrings (such as those returned by `cat`, `grep`, etc). _Like Unix
-redirections, `to()` will overwrite any existing file!_
+`ShellStrings` (such as those returned by `cat`, `grep`, etc.). _Like Unix
+redirections, `to()` will overwrite any existing file!_ Returns the same
+[ShellString](#shellstringstr) this operated on, to support chaining.
 
 
 ### ShellString.prototype.toEnd(file)
@@ -625,33 +717,42 @@ cat('input.txt').toEnd('output.txt');
 ```
 
 Analogous to the redirect-and-append operator `>>` in Unix, but works with
-ShellStrings (such as those returned by `cat`, `grep`, etc).
+`ShellStrings` (such as those returned by `cat`, `grep`, etc.). Returns the
+same [ShellString](#shellstringstr) this operated on, to support chaining.
 
 
 ### touch([options,] file [, file ...])
 ### touch([options,] file_array)
+
 Available options:
 
 + `-a`: Change only the access time
 + `-c`: Do not create any files
 + `-m`: Change only the modification time
-+ `-d DATE`: Parse DATE and use it instead of current time
-+ `-r FILE`: Use FILE's times instead of current time
++ `{'-d': someDate}`, `{date: someDate}`: Use a `Date` instance (ex. `someDate`)
+  instead of current time
++ `{'-r': file}`, `{reference: file}`: Use `file`'s times instead of current
+  time
 
 Examples:
 
 ```javascript
 touch('source.js');
-touch('-c', '/path/to/some/dir/source.js');
-touch({ '-r': FILE }, '/path/to/some/dir/source.js');
+touch('-c', 'path/to/file.js');
+touch({ '-r': 'referenceFile.txt' }, 'path/to/file.js');
+touch({ '-d': new Date('December 17, 1995 03:24:00'), '-m': true }, 'path/to/file.js');
+touch({ date: new Date('December 17, 1995 03:24:00') }, 'path/to/file.js');
 ```
 
-Update the access and modification times of each FILE to the current time.
-A FILE argument that does not exist is created empty, unless -c is supplied.
-This is a partial implementation of *[touch(1)](http://linux.die.net/man/1/touch)*.
+Update the access and modification times of each file to the current time.
+A file argument that does not exist is created empty, unless `-c` is supplied.
+This is a partial implementation of
+[`touch(1)`](http://linux.die.net/man/1/touch). Returns a
+[ShellString](#shellstringstr) indicating success or failure.
 
 
 ### uniq([options,] [input, [output]])
+
 Available options:
 
 + `-i`: Ignore case while comparing
@@ -666,7 +767,8 @@ uniq('-i', 'foo.txt');
 uniq('-cd', 'foo.txt', 'bar.txt');
 ```
 
-Filter adjacent matching lines from input
+Filter adjacent matching lines from `input`. Returns a
+[ShellString](#shellstringstr).
 
 
 ### which(command)
@@ -677,38 +779,55 @@ Examples:
 var nodeExec = which('node');
 ```
 
-Searches for `command` in the system's PATH. On Windows, this uses the
+Searches for `command` in the system's `PATH`. On Windows, this uses the
 `PATHEXT` variable to append the extension if it's not already executable.
-Returns string containing the absolute path to the command.
+Returns a [ShellString](#shellstringstr) containing the absolute path to
+`command`.
 
 
 ### exit(code)
-Exits the current process with the given exit code.
+
+Exits the current process with the given exit `code`.
 
 ### error()
+
 Tests if error occurred in the last command. Returns a truthy value if an
-error returned and a falsy value otherwise.
+error returned, or a falsy value otherwise.
 
 **Note**: do not rely on the
 return value to be an error message. If you need the last error message, use
 the `.stderr` attribute from the last command's return value instead.
 
 
+### errorCode()
+
+Returns the error code from the last command.
+
+
 ### ShellString(str)
 
 Examples:
 
 ```javascript
-var foo = ShellString('hello world');
+var foo = new ShellString('hello world');
 ```
 
-Turns a regular string into a string-like object similar to what each
-command returns. This has special methods, like `.to()` and `.toEnd()`
+This is a dedicated type returned by most ShellJS methods, which wraps a
+string (or array) value. This has all the string (or array) methods, but
+also exposes extra methods: [`.to()`](#shellstringprototypetofile),
+[`.toEnd()`](#shellstringprototypetoendfile), and all the pipe-able methods
+(ex. `.cat()`, `.grep()`, etc.). This can be easily converted into a string
+by calling `.toString()`.
+
+This type also exposes the corresponding command's stdout, stderr, and
+return status code via the `.stdout` (string), `.stderr` (string), and
+`.code` (number) properties respectively.
 
 
 ### env['VAR_NAME']
+
 Object containing environment variables (both getter and setter). Shortcut
-to process.env.
+to `process.env`.
 
 ### Pipes
 
@@ -716,7 +835,7 @@ Examples:
 
 ```javascript
 grep('foo', 'file1.txt', 'file2.txt').sed(/o/g, 'a').to('output.txt');
-echo('files with o\'s in the name:\n' + ls().grep('o'));
+echo("files with o's in the name:\n" + ls().grep('o'));
 cat('test.js').exec('node'); // pipe to exec() call
 ```
 
@@ -753,9 +872,9 @@ cp('this_file_does_not_exist', '/dev/null'); // throws Error here
 /* more commands... */
 ```
 
-If `true` the script will throw a Javascript error when any shell.js
+If `true`, the script will throw a Javascript error when any shell.js
 command encounters an error. Default is `false`. This is analogous to
-Bash's `set -e`
+Bash's `set -e`.
 
 ### config.verbose
 
@@ -764,17 +883,26 @@ Example:
 ```javascript
 config.verbose = true; // or set('-v');
 cd('dir/');
-ls('subdir/');
+rm('-rf', 'foo.txt', 'bar.txt');
+exec('echo hello');
 ```
 
 Will print each command as follows:
 
 ```
 cd dir/
-ls subdir/
+rm -rf foo.txt bar.txt
+exec echo hello
 ```
 
-### config.globOptions
+### config.globOptions (deprecated)
+
+**Deprecated**: we recommend that you do not edit `config.globOptions`.
+Support for this configuration option may be changed or removed in a future
+ShellJS release.
+
+**Breaking change**: ShellJS v0.8.x uses `node-glob`. Starting with ShellJS
+v0.9.x, `config.globOptions` is compatible with `fast-glob`.
 
 Example:
 
@@ -782,7 +910,11 @@ Example:
 config.globOptions = {nodir: true};
 ```
 
-Use this value for calls to `glob.sync()` instead of the default options.
+`config.globOptions` changes how ShellJS expands glob (wildcard)
+expressions. See
+[fast-glob](https://github.com/mrmlnc/fast-glob?tab=readme-ov-file#options-3)
+for available options. Be aware that modifying `config.globOptions` **may
+break ShellJS functionality.**
 
 ### config.reset()
 
@@ -797,7 +929,7 @@ shell.config.reset(); // reset to original state
 /* ... */
 ```
 
-Reset shell.config to the defaults:
+Reset `shell.config` to the defaults:
 
 ```javascript
 {
@@ -812,6 +944,6 @@ Reset shell.config to the defaults:
 
 ## Team
 
-| [![Nate Fischer](https://avatars.githubusercontent.com/u/5801521?s=130)](https://github.com/nfischer) | [![Ari Porad](https://avatars1.githubusercontent.com/u/1817508?v=3&s=130)](http://github.com/ariporad) |
-|:---:|:---:|
-| [Nate Fischer](https://github.com/nfischer) | [Ari Porad](http://github.com/ariporad) |
+| [![Nate Fischer](https://avatars.githubusercontent.com/u/5801521?s=130)](https://github.com/nfischer) |
+|:---:|
+| [Nate Fischer](https://github.com/nfischer) |
diff --git a/RELEASE.md b/RELEASE.md
index 90802c33c..751cad391 100644
--- a/RELEASE.md
+++ b/RELEASE.md
@@ -1,14 +1,14 @@
 # Release steps
 
-1. Ensure master passes CI tests
-2. `npm run gendocs`
-3. Bump version, create tags, push, and release:
+1. Ensure main branch passes CI tests
+2. Bump version, create tags, push, and release:
   - `$ npm run <release:major|release:minor|release:patch>`
   - `major` - breaking API changes
   - `minor` - backwards-compatible features
   - `patch` - backwards-compatible bug fixes
-4. Update CHANGELOG.md
+3. Update `CHANGELOG.md`
   - `$ npm run changelog`
+  - Manually verify that the changelog makes sense
   - `$ git push`
-5. Generate the documentup website by visiting
-  [http://documentup.com/shelljs/shelljs/__recompile] in your browser
+4. Update https://github.com/shelljs/shelljs/releases to create a new release
+   from the latest git tag
diff --git a/appveyor.yml b/appveyor.yml
deleted file mode 100644
index bbde9e705..000000000
--- a/appveyor.yml
+++ /dev/null
@@ -1,26 +0,0 @@
-environment:
-  matrix:
-    - nodejs_version: '7'
-    - nodejs_version: '6'
-    - nodejs_version: '5'
-    - nodejs_version: '4'
-
-version: '{build}'
-
-# Install scripts. (runs after repo cloning)
-install:
-  - ps: Install-Product node $env:nodejs_version
-  - npm -g install npm@latest
-  - set PATH=%APPDATA%\npm;%PATH%
-  - node --version
-  - npm --version
-  - npm install
-
-matrix:
-  fast_finish: true
-
-# No need for MSBuild on this project
-build: off
-
-test_script:
-  - npm test
diff --git a/bin/shjs b/bin/shjs
deleted file mode 100755
index 75ca58b9d..000000000
--- a/bin/shjs
+++ /dev/null
@@ -1,39 +0,0 @@
-#!/usr/bin/env node
-require('../global');
-
-if (process.argv.length < 3) {
-  console.log('ShellJS: missing argument (script name)');
-  console.log();
-  process.exit(1);
-}
-
-var args,
-  scriptName = process.argv[2];
-env['NODE_PATH'] = __dirname + '/../..';
-
-if (!scriptName.match(/\.js/) && !scriptName.match(/\.coffee/)) {
-  if (test('-f', scriptName + '.js'))
-    scriptName += '.js';
-  if (test('-f', scriptName + '.coffee'))
-    scriptName += '.coffee';
-}
-
-if (!test('-f', scriptName)) {
-  console.log('ShellJS: script not found ('+scriptName+')');
-  console.log();
-  process.exit(1);
-}
-
-args = process.argv.slice(3);
-
-for (var i = 0, l = args.length; i < l; i++) {
-  if (args[i][0] !== "-"){
-    args[i] = '"' + args[i] + '"'; // fixes arguments with multiple words
-  }
-}
-
-var path = require('path');
-var extensions = require('interpret').extensions;
-var rechoir = require('rechoir');
-rechoir.prepare(extensions, scriptName);
-require(require.resolve(path.resolve(process.cwd(), scriptName)));
diff --git a/commands.json b/commands.json
deleted file mode 100644
index 9254e92dd..000000000
--- a/commands.json
+++ /dev/null
@@ -1,29 +0,0 @@
-[
-  "cat",
-  "cd",
-  "chmod",
-  "cp",
-  "dirs",
-  "echo",
-  "exec",
-  "find",
-  "grep",
-  "head",
-  "ln",
-  "ls",
-  "mkdir",
-  "mv",
-  "pwd",
-  "rm",
-  "sed",
-  "set",
-  "sort",
-  "tail",
-  "tempdir",
-  "test",
-  "to",
-  "toEnd",
-  "touch",
-  "uniq",
-  "which"
-]
diff --git a/global.js b/global.js
index b232e66d5..e061f5a1e 100644
--- a/global.js
+++ b/global.js
@@ -1,12 +1,15 @@
 /* eslint no-extend-native: 0 */
-var shell = require('./shell.js');
+var shell = require('./shell');
 var common = require('./src/common');
+
 Object.keys(shell).forEach(function (cmd) {
   global[cmd] = shell[cmd];
 });
 
 var _to = require('./src/to');
+
 String.prototype.to = common.wrap('to', _to);
 
 var _toEnd = require('./src/toEnd');
+
 String.prototype.toEnd = common.wrap('toEnd', _toEnd);
diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 000000000..cdaeeed0a
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,6431 @@
+{
+  "name": "shelljs",
+  "version": "0.10.0",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "shelljs",
+      "version": "0.10.0",
+      "license": "BSD-3-Clause",
+      "dependencies": {
+        "execa": "^5.1.1",
+        "fast-glob": "^3.3.2"
+      },
+      "devDependencies": {
+        "ava": "^6.2.0",
+        "chalk": "^4.1.2",
+        "coffee-script": "^1.12.7",
+        "eslint": "^8.2.0",
+        "eslint-config-airbnb-base": "^15.0.0",
+        "eslint-plugin-import": "^2.31.0",
+        "js-yaml": "^4.1.0",
+        "nyc": "^17.1.0",
+        "shelljs-changelog": "^0.2.6",
+        "shelljs-release": "^0.5.3",
+        "shx": "^0.4.0"
+      },
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/@ampproject/remapping": {
+      "version": "2.3.0",
+      "resolved": "https://registry.npmjs.org/@ampproject/remapping/-/remapping-2.3.0.tgz",
+      "integrity": "sha512-30iZtAPgz+LTIYoeivqYo853f02jBYSd5uGnGpkFV0M3xOt9aN73erkgYAmZU43x4VfqcnLxW9Kpg3R5LC4YYw==",
+      "dev": true,
+      "dependencies": {
+        "@jridgewell/gen-mapping": "^0.3.5",
+        "@jridgewell/trace-mapping": "^0.3.24"
+      },
+      "engines": {
+        "node": ">=6.0.0"
+      }
+    },
+    "node_modules/@babel/code-frame": {
+      "version": "7.26.2",
+      "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.26.2.tgz",
+      "integrity": "sha512-RJlIHRueQgwWitWgF8OdFYGZX328Ax5BCemNGlqHfplnRT9ESi8JkFlvaVYbS+UubVY6dpv87Fs2u5M29iNFVQ==",
+      "dev": true,
+      "dependencies": {
+        "@babel/helper-validator-identifier": "^7.25.9",
+        "js-tokens": "^4.0.0",
+        "picocolors": "^1.0.0"
+      },
+      "engines": {
+        "node": ">=6.9.0"
+      }
+    },
+    "node_modules/@babel/compat-data": {
+      "version": "7.26.8",
+      "resolved": "https://registry.npmjs.org/@babel/compat-data/-/compat-data-7.26.8.tgz",
+      "integrity": "sha512-oH5UPLMWR3L2wEFLnFJ1TZXqHufiTKAiLfqw5zkhS4dKXLJ10yVztfil/twG8EDTA4F/tvVNw9nOl4ZMslB8rQ==",
+      "dev": true,
+      "engines": {
+        "node": ">=6.9.0"
+      }
+    },
+    "node_modules/@babel/core": {
+      "version": "7.26.10",
+      "resolved": "https://registry.npmjs.org/@babel/core/-/core-7.26.10.tgz",
+      "integrity": "sha512-vMqyb7XCDMPvJFFOaT9kxtiRh42GwlZEg1/uIgtZshS5a/8OaduUfCi7kynKgc3Tw/6Uo2D+db9qBttghhmxwQ==",
+      "dev": true,
+      "dependencies": {
+        "@ampproject/remapping": "^2.2.0",
+        "@babel/code-frame": "^7.26.2",
+        "@babel/generator": "^7.26.10",
+        "@babel/helper-compilation-targets": "^7.26.5",
+        "@babel/helper-module-transforms": "^7.26.0",
+        "@babel/helpers": "^7.26.10",
+        "@babel/parser": "^7.26.10",
+        "@babel/template": "^7.26.9",
+        "@babel/traverse": "^7.26.10",
+        "@babel/types": "^7.26.10",
+        "convert-source-map": "^2.0.0",
+        "debug": "^4.1.0",
+        "gensync": "^1.0.0-beta.2",
+        "json5": "^2.2.3",
+        "semver": "^6.3.1"
+      },
+      "engines": {
+        "node": ">=6.9.0"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/babel"
+      }
+    },
+    "node_modules/@babel/core/node_modules/convert-source-map": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/convert-source-map/-/convert-source-map-2.0.0.tgz",
+      "integrity": "sha512-Kvp459HrV2FEJ1CAsi1Ku+MY3kasH19TFykTz2xWmMeq6bk2NU3XXvfJ+Q61m0xktWwt+1HSYf3JZsTms3aRJg==",
+      "dev": true
+    },
+    "node_modules/@babel/core/node_modules/semver": {
+      "version": "6.3.1",
+      "resolved": "https://registry.npmjs.org/semver/-/semver-6.3.1.tgz",
+      "integrity": "sha512-BR7VvDCVHO+q2xBEWskxS6DJE1qRnb7DxzUrogb71CWoSficBxYsiAGd+Kl0mmq/MprG9yArRkyrQxTO6XjMzA==",
+      "dev": true,
+      "bin": {
+        "semver": "bin/semver.js"
+      }
+    },
+    "node_modules/@babel/generator": {
+      "version": "7.27.0",
+      "resolved": "https://registry.npmjs.org/@babel/generator/-/generator-7.27.0.tgz",
+      "integrity": "sha512-VybsKvpiN1gU1sdMZIp7FcqphVVKEwcuj02x73uvcHE0PTihx1nlBcowYWhDwjpoAXRv43+gDzyggGnn1XZhVw==",
+      "dev": true,
+      "dependencies": {
+        "@babel/parser": "^7.27.0",
+        "@babel/types": "^7.27.0",
+        "@jridgewell/gen-mapping": "^0.3.5",
+        "@jridgewell/trace-mapping": "^0.3.25",
+        "jsesc": "^3.0.2"
+      },
+      "engines": {
+        "node": ">=6.9.0"
+      }
+    },
+    "node_modules/@babel/helper-compilation-targets": {
+      "version": "7.27.0",
+      "resolved": "https://registry.npmjs.org/@babel/helper-compilation-targets/-/helper-compilation-targets-7.27.0.tgz",
+      "integrity": "sha512-LVk7fbXml0H2xH34dFzKQ7TDZ2G4/rVTOrq9V+icbbadjbVxxeFeDsNHv2SrZeWoA+6ZiTyWYWtScEIW07EAcA==",
+      "dev": true,
+      "dependencies": {
+        "@babel/compat-data": "^7.26.8",
+        "@babel/helper-validator-option": "^7.25.9",
+        "browserslist": "^4.24.0",
+        "lru-cache": "^5.1.1",
+        "semver": "^6.3.1"
+      },
+      "engines": {
+        "node": ">=6.9.0"
+      }
+    },
+    "node_modules/@babel/helper-compilation-targets/node_modules/semver": {
+      "version": "6.3.1",
+      "resolved": "https://registry.npmjs.org/semver/-/semver-6.3.1.tgz",
+      "integrity": "sha512-BR7VvDCVHO+q2xBEWskxS6DJE1qRnb7DxzUrogb71CWoSficBxYsiAGd+Kl0mmq/MprG9yArRkyrQxTO6XjMzA==",
+      "dev": true,
+      "bin": {
+        "semver": "bin/semver.js"
+      }
+    },
+    "node_modules/@babel/helper-module-imports": {
+      "version": "7.25.9",
+      "resolved": "https://registry.npmjs.org/@babel/helper-module-imports/-/helper-module-imports-7.25.9.tgz",
+      "integrity": "sha512-tnUA4RsrmflIM6W6RFTLFSXITtl0wKjgpnLgXyowocVPrbYrLUXSBXDgTs8BlbmIzIdlBySRQjINYs2BAkiLtw==",
+      "dev": true,
+      "dependencies": {
+        "@babel/traverse": "^7.25.9",
+        "@babel/types": "^7.25.9"
+      },
+      "engines": {
+        "node": ">=6.9.0"
+      }
+    },
+    "node_modules/@babel/helper-module-transforms": {
+      "version": "7.26.0",
+      "resolved": "https://registry.npmjs.org/@babel/helper-module-transforms/-/helper-module-transforms-7.26.0.tgz",
+      "integrity": "sha512-xO+xu6B5K2czEnQye6BHA7DolFFmS3LB7stHZFaOLb1pAwO1HWLS8fXA+eh0A2yIvltPVmx3eNNDBJA2SLHXFw==",
+      "dev": true,
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+      "integrity": "sha512-zymm5+u+sCsSWyD9qNaejV3DFvhCKclKdizYaJUuHA83RLjb7nSuGnddCHGv0hk+KY7BMAlsWeK4Ueg6EV6XQg==",
+      "dev": true,
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/yargs/node_modules/string-width": {
+      "version": "4.2.3",
+      "resolved": "https://registry.npmjs.org/string-width/-/string-width-4.2.3.tgz",
+      "integrity": "sha512-wKyQRQpjJ0sIp62ErSZdGsjMJWsap5oRNihHhu6G7JVO/9jIB6UyevL+tXuOqrng8j/cxKTWyWUwvSTriiZz/g==",
+      "dev": true,
+      "dependencies": {
+        "emoji-regex": "^8.0.0",
+        "is-fullwidth-code-point": "^3.0.0",
+        "strip-ansi": "^6.0.1"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/yargs/node_modules/strip-ansi": {
+      "version": "6.0.1",
+      "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-6.0.1.tgz",
+      "integrity": "sha512-Y38VPSHcqkFrCpFnQ9vuSXmquuv5oXOKpGeT6aGrr3o3Gc9AlVa6JBfUSOCnbxGGZF+/0ooI7KrPuUSztUdU5A==",
+      "dev": true,
+      "dependencies": {
+        "ansi-regex": "^5.0.1"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/yocto-queue": {
+      "version": "0.1.0",
+      "resolved": "https://registry.npmjs.org/yocto-queue/-/yocto-queue-0.1.0.tgz",
+      "integrity": "sha512-rVksvsnNCdJ/ohGc6xgPwyN8eheCxsiLM8mxuE/t/mOVqJewPuO1miLpTHQiRgTKCLexL4MeAFVagts7HmNZ2Q==",
+      "dev": true,
+      "engines": {
+        "node": ">=10"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
+      }
+    }
+  }
+}
diff --git a/package.json b/package.json
index af41a52bd..243271d9a 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "shelljs",
-  "version": "0.7.6",
+  "version": "0.10.0",
   "description": "Portable Unix shell commands for Node.js",
   "keywords": [
     "shelljs",
@@ -23,50 +23,66 @@
   "license": "BSD-3-Clause",
   "homepage": "http://github.com/shelljs/shelljs",
   "main": "./shell.js",
+  "exports": {
+    ".": "./shell.js",
+    "./global": "./global.js",
+    "./global.js": "./global.js",
+    "./make": "./make.js",
+    "./make.js": "./make.js",
+    "./package": "./package.json",
+    "./package.json": "./package.json",
+    "./plugin": "./plugin.js",
+    "./plugin.js": "./plugin.js"
+  },
   "files": [
-    "commands.json",
     "global.js",
     "make.js",
     "plugin.js",
     "shell.js",
-    "bin",
     "src"
   ],
   "scripts": {
+    "check-node-support": "node scripts/check-node-support",
     "posttest": "npm run lint",
-    "test": "nyc --reporter=text --reporter=lcov ava --serial test/*.js",
-    "test-no-coverage": "ava --serial test/*.js",
+    "test": "ava",
+    "test-with-coverage": "nyc --reporter=text --reporter=lcov ava",
     "gendocs": "node scripts/generate-docs",
     "lint": "eslint .",
-    "after-travis": "travis-check-changes",
     "changelog": "shelljs-changelog",
     "release:major": "shelljs-release major",
     "release:minor": "shelljs-release minor",
     "release:patch": "shelljs-release patch"
   },
-  "bin": {
-    "shjs": "./bin/shjs"
-  },
   "dependencies": {
-    "glob": "^7.0.0",
-    "interpret": "^1.0.0",
-    "rechoir": "^0.6.2"
+    "execa": "^5.1.1",
+    "fast-glob": "^3.3.2"
+  },
+  "ava": {
+    "serial": true,
+    "workerThreads": false,
+    "powerAssert": false,
+    "files": [
+      "test/*.js"
+    ],
+    "helpers": [
+      "test/resources/**",
+      "test/utils/**"
+    ]
   },
   "devDependencies": {
-    "ava": "^0.16.0",
-    "coffee-script": "^1.10.0",
-    "eslint": "^2.0.0",
-    "eslint-config-airbnb-base": "^3.0.0",
-    "eslint-plugin-import": "^1.11.1",
-    "nyc": "^10.0.0",
-    "shelljs-changelog": "^0.2.0",
-    "shelljs-release": "^0.2.0",
-    "shx": "^0.2.0",
-    "travis-check-changes": "^0.2.0"
+    "ava": "^6.2.0",
+    "chalk": "^4.1.2",
+    "coffee-script": "^1.12.7",
+    "eslint": "^8.2.0",
+    "eslint-config-airbnb-base": "^15.0.0",
+    "eslint-plugin-import": "^2.31.0",
+    "js-yaml": "^4.1.0",
+    "nyc": "^17.1.0",
+    "shelljs-changelog": "^0.2.6",
+    "shelljs-release": "^0.5.3",
+    "shx": "^0.4.0"
   },
-  "optionalDependencies": {},
   "engines": {
-    "node": ">=0.11.0",
-    "iojs": "*"
+    "node": ">=18"
   }
 }
diff --git a/plugin.js b/plugin.js
index f879ab320..2e1585092 100644
--- a/plugin.js
+++ b/plugin.js
@@ -1,4 +1,4 @@
-// Various utilties exposed to plugins
+// Various utilities exposed to plugins
 
 require('./shell'); // Create the ShellJS instance (mandatory)
 
diff --git a/scripts/check-node-support.js b/scripts/check-node-support.js
new file mode 100755
index 000000000..df2065e17
--- /dev/null
+++ b/scripts/check-node-support.js
@@ -0,0 +1,96 @@
+#!/usr/bin/env node
+
+var assert = require('assert');
+var path = require('path');
+
+// eslint-disable-next-line import/no-extraneous-dependencies
+var yaml = require('js-yaml');
+
+var shell = require('..');
+
+// This is the authoritative list of supported node versions.
+var MIN_NODE_VERSION = 18;
+var MAX_NODE_VERSION = 26;
+
+// Ideally this map should be empty, however we can pin node releases to
+// specific versions if necessary to workaround bugs. See
+// https://github.com/shelljs/shelljs/issues/1180.
+var pinnedNodeVersions = {
+  // Format:
+  // majorVersionInt: 'full.node.version',
+  // Example:
+  // 22: '22.9.0',
+};
+
+function checkReadme(minNodeVersion) {
+  var start = '<!-- start minVersion -->';
+  var stop = '<!-- stop minVersion -->';
+  var formattedMinVersion = '`v' + minNodeVersion + '`';
+  var expectedReadmeRegex = new RegExp(
+      start + '\\s*' + formattedMinVersion + '\\s*' + stop, '',
+  );
+  var readme = path.join(__dirname, '..', 'README.md');
+  var match = shell.grep(expectedReadmeRegex, readme);
+  if (!match.toString().trim()) {
+    var msg = 'Update README to specify the min supported version. Look for "'
+        + start + '"';
+    throw new Error(msg);
+  }
+}
+
+function checkEngines(minNodeVersion, packageJson) {
+  var expectedEnginesNode = '>=' + minNodeVersion;
+  if (packageJson.engines.node !== expectedEnginesNode) {
+    var msg = 'Update package.json to fix the "engines" attribute';
+    throw new Error(msg);
+  }
+}
+
+function assertDeepEquals(arr1, arr2, msg) {
+  try {
+    assert.deepStrictEqual(arr1, arr2);
+  } catch (e) {
+    throw new Error(msg + '\n' + e);
+  }
+}
+
+function range(start, stop) {
+  var ret = [];
+  for (var i = start; i <= stop; i += 2) {
+    if (i % 2 !== 0) {
+      console.warn('Warning: testing a non-LTS nodejs release: ' + i);
+    }
+    ret.push(i);
+  }
+  return ret;
+}
+
+function checkGithubActions(minNodeVersion, maxNodeVersion, githubActionsYaml) {
+  var expectedVersions = range(minNodeVersion, maxNodeVersion);
+  expectedVersions = expectedVersions.map(function (majorVersion) {
+    return pinnedNodeVersions[majorVersion] || majorVersion;
+  });
+  var msg = 'Check GitHub Actions node_js versions';
+  assertDeepEquals(githubActionsYaml.jobs.test.strategy.matrix['node-version'],
+      expectedVersions, msg);
+}
+
+try {
+  checkReadme(MIN_NODE_VERSION);
+
+  var packageJson = require('../package.json');
+  checkEngines(MIN_NODE_VERSION, packageJson);
+
+  var githubActionsFileName = path.join(__dirname, '..', '.github', 'workflows',
+      'main.yml');
+  var githubActionsYaml = yaml.load(shell.cat(githubActionsFileName));
+  checkGithubActions(MIN_NODE_VERSION, MAX_NODE_VERSION, githubActionsYaml);
+
+  console.log('All files look good (this project supports LTS releases v'
+      + MIN_NODE_VERSION + '-v' + MAX_NODE_VERSION + ')!');
+} catch (e) {
+  console.error('Please check the files which declare our Node version');
+  console.error('support, as something is out-of-sync. This script failed');
+  console.error('specificaly because:');
+  throw e;
+}
diff --git a/scripts/generate-docs.js b/scripts/generate-docs.js
index 9b31f1701..3942c28b4 100755
--- a/scripts/generate-docs.js
+++ b/scripts/generate-docs.js
@@ -1,35 +1,76 @@
 #!/usr/bin/env node
-/* globals cat, cd, echo, grep, sed, ShellString */
+/* globals cat, cd, echo, grep, ls, sed, ShellString */
 require('../global');
 
-echo('Appending docs to README.md');
+var path = require('path');
 
-cd(__dirname + '/..');
+var COMMAND_PREFIX = '## Command reference';
+var COMMAND_SUFFIX = '\n## Team';
+var COMMAND_PATTERN = /## Command reference\n\n((?:.|\n)*)\n## Team/;
+function extractCurrentDocs() {
+  var m = cat('README.md').match(COMMAND_PATTERN);
+  if (m) {
+    var docs = m[1];
+    return docs;
+  }
+  /* istanbul ignore next */
+  throw new Error('Unable to extract current docs');
+}
+module.exports.extractCurrentDocs = extractCurrentDocs;
 
-// Extract docs from shell.js
-var docs = grep('^//@', 'shell.js');
+function generateNewDocs() {
+  // Extract docs from shell.js
+  var docs = grep('^//@', 'shell.js');
 
-// Insert the docs for all the registered commands
-docs = docs.replace(/\/\/@commands\n/g, function () {
-  return require('../commands.json').map(function (commandName) {
-    var file = './src/' + commandName + '.js';
-    return grep('^//@', file) + '\n';
-  }).join('');
-});
+  // Insert the docs for all the registered commands
+  var blocklist = [
+    './src/common.js',
+    './src/error.js',
+    './src/errorCode.js',
+  ];
+  docs = docs.replace(/\/\/@commands\n/g, function () {
+    return ls('./src/*.js').map(function (file) {
+      if (blocklist.includes(file)) {
+        return '';
+      }
+      var commandDoc = grep('^//@', file).toString();
+      if (commandDoc !== '') {
+        commandDoc += '\n';
+      }
+      return commandDoc;
+    }).join('');
+  });
 
-// Now extract docs from the remaining src/*.js files
-docs = docs.replace(/\/\/@include (.+)/g, function (match, path) {
-  var file = path.match('.js$') ? path : path + '.js';
-  return grep('^//@', file);
-});
+  // Now extract docs from the remaining src/*.js files
+  docs = docs.replace(/\/\/@include (.+)/g, function (match, filename) {
+    return grep('^//@', filename);
+  });
 
-// Remove '//@'
-docs = docs.replace(/\/\/@ ?/g, '');
+  // Remove '//@'
+  docs = docs.replace(/\/\/@ ?/g, '');
+  return docs;
+}
+module.exports.generateNewDocs = generateNewDocs;
 
-// Wipe out the old docs
-ShellString(cat('README.md').replace(/## Command reference(.|\n)*\n## Team/, '## Command reference\n## Team')).to('README.md');
+/* istanbul ignore next */
+function main() {
+  echo('Appending docs to README.md');
 
-// Append new docs to README
-sed('-i', /## Command reference/, '## Command reference\n\n' + docs, 'README.md');
+  cd(path.join(__dirname, '..'));
 
-echo('All done.');
+  var docs = generateNewDocs();
+
+  // Wipe out the old docs
+  ShellString(cat('README.md').replace(COMMAND_PATTERN,
+    COMMAND_PREFIX + COMMAND_SUFFIX)).to('README.md');
+
+  // Append new docs to README
+  sed('-i', /## Command reference/, COMMAND_PREFIX + '\n\n' + docs, 'README.md');
+
+  echo('All done.');
+}
+
+/* istanbul ignore if */
+if (require.main === module) {
+  main();
+}
diff --git a/shell.js b/shell.js
index 44bfbdc78..8a3a67d30 100644
--- a/shell.js
+++ b/shell.js
@@ -8,10 +8,12 @@
 
 var common = require('./src/common');
 
+module.exports = common.shell;
+
 //@
 //@ All commands run synchronously, unless otherwise stated.
 //@ All commands accept standard bash globbing characters (`*`, `?`, etc.),
-//@ compatible with the [node glob module](https://github.com/isaacs/node-glob).
+//@ compatible with [`fast-glob`](https://www.npmjs.com/package/fast-glob).
 //@
 //@ For less-commonly used commands and features, please check out our [wiki
 //@ page](https://github.com/shelljs/shelljs/wiki).
@@ -20,27 +22,76 @@ var common = require('./src/common');
 // Include the docs for all the default commands
 //@commands
 
-// Load all default commands
-require('./commands.json').forEach(function (command) {
-  require('./src/' + command);
-});
+// Load all default commands. We import these for their side effect of loading
+// using the plugin architecture via `common.register()`.
+require('./src/cat');
+require('./src/cd');
+require('./src/chmod');
+require('./src/cmd');
+require('./src/cp');
+require('./src/dirs');
+require('./src/echo');
+require('./src/exec');
+require('./src/exec-child'); // A hint to the bundler to keep exec-child.js
+require('./src/find');
+require('./src/grep');
+require('./src/head');
+require('./src/ln');
+require('./src/ls');
+require('./src/mkdir');
+require('./src/mv');
+require('./src/popd');
+require('./src/pushd');
+require('./src/pwd');
+require('./src/rm');
+require('./src/sed');
+require('./src/set');
+require('./src/sort');
+require('./src/tail');
+require('./src/tempdir');
+require('./src/test');
+require('./src/to');
+require('./src/toEnd');
+require('./src/touch');
+require('./src/uniq');
+require('./src/which');
 
 //@
 //@ ### exit(code)
-//@ Exits the current process with the given exit code.
-exports.exit = process.exit;
-
-//@include ./src/error
-exports.error = require('./src/error');
-
-//@include ./src/common
-exports.ShellString = common.ShellString;
+//@
+//@ Exits the current process with the given exit `code`.
+module.exports.exit = function exit(code) {
+  common.state.error = null;
+  common.state.errorCode = 0;
+  if (code) {
+    common.error('exit', {
+      continue: true,
+      code,
+      prefix: '',
+      silent: true,
+      fatal: false,
+    });
+    process.exit(code);
+  } else {
+    process.exit();
+  }
+};
+
+//@include ./src/error.js
+module.exports.error = require('./src/error');
+
+//@include ./src/errorCode.js
+module.exports.errorCode = require('./src/errorCode');
+
+//@include ./src/common.js
+module.exports.ShellString = common.ShellString;
 
 //@
 //@ ### env['VAR_NAME']
+//@
 //@ Object containing environment variables (both getter and setter). Shortcut
-//@ to process.env.
-exports.env = process.env;
+//@ to `process.env`.
+module.exports.env = process.env;
 
 //@
 //@ ### Pipes
@@ -49,7 +100,7 @@ exports.env = process.env;
 //@
 //@ ```javascript
 //@ grep('foo', 'file1.txt', 'file2.txt').sed(/o/g, 'a').to('output.txt');
-//@ echo('files with o\'s in the name:\n' + ls().grep('o'));
+//@ echo("files with o's in the name:\n" + ls().grep('o'));
 //@ cat('test.js').exec('node'); // pipe to exec() call
 //@ ```
 //@
@@ -61,7 +112,7 @@ exports.env = process.env;
 //@ ## Configuration
 //@
 
-exports.config = common.config;
+module.exports.config = common.config;
 
 //@
 //@ ### config.silent
@@ -91,9 +142,9 @@ exports.config = common.config;
 //@ /* more commands... */
 //@ ```
 //@
-//@ If `true` the script will throw a Javascript error when any shell.js
+//@ If `true`, the script will throw a Javascript error when any shell.js
 //@ command encounters an error. Default is `false`. This is analogous to
-//@ Bash's `set -e`
+//@ Bash's `set -e`.
 
 //@
 //@ ### config.verbose
@@ -103,18 +154,27 @@ exports.config = common.config;
 //@ ```javascript
 //@ config.verbose = true; // or set('-v');
 //@ cd('dir/');
-//@ ls('subdir/');
+//@ rm('-rf', 'foo.txt', 'bar.txt');
+//@ exec('echo hello');
 //@ ```
 //@
 //@ Will print each command as follows:
 //@
 //@ ```
 //@ cd dir/
-//@ ls subdir/
+//@ rm -rf foo.txt bar.txt
+//@ exec echo hello
 //@ ```
 
 //@
-//@ ### config.globOptions
+//@ ### config.globOptions (deprecated)
+//@
+//@ **Deprecated**: we recommend that you do not edit `config.globOptions`.
+//@ Support for this configuration option may be changed or removed in a future
+//@ ShellJS release.
+//@
+//@ **Breaking change**: ShellJS v0.8.x uses `node-glob`. Starting with ShellJS
+//@ v0.9.x, `config.globOptions` is compatible with `fast-glob`.
 //@
 //@ Example:
 //@
@@ -122,7 +182,11 @@ exports.config = common.config;
 //@ config.globOptions = {nodir: true};
 //@ ```
 //@
-//@ Use this value for calls to `glob.sync()` instead of the default options.
+//@ `config.globOptions` changes how ShellJS expands glob (wildcard)
+//@ expressions. See
+//@ [fast-glob](https://github.com/mrmlnc/fast-glob?tab=readme-ov-file#options-3)
+//@ for available options. Be aware that modifying `config.globOptions` **may
+//@ break ShellJS functionality.**
 
 //@
 //@ ### config.reset()
@@ -138,7 +202,7 @@ exports.config = common.config;
 //@ /* ... */
 //@ ```
 //@
-//@ Reset shell.config to the defaults:
+//@ Reset `shell.config` to the defaults:
 //@
 //@ ```javascript
 //@ {
diff --git a/src/cat.js b/src/cat.js
index a74a25c84..ca264a9d1 100644
--- a/src/cat.js
+++ b/src/cat.js
@@ -1,13 +1,20 @@
-var common = require('./common');
 var fs = require('fs');
+var common = require('./common');
 
 common.register('cat', _cat, {
   canReceivePipe: true,
+  cmdOptions: {
+    'n': 'number',
+  },
 });
 
 //@
-//@ ### cat(file [, file ...])
-//@ ### cat(file_array)
+//@ ### cat([options,] file [, file ...])
+//@ ### cat([options,] file_array)
+//@
+//@ Available options:
+//@
+//@ + `-n`: number all output lines
 //@
 //@ Examples:
 //@
@@ -17,9 +24,9 @@ common.register('cat', _cat, {
 //@ var str = cat(['file1', 'file2']); // same as above
 //@ ```
 //@
-//@ Returns a string containing the given file, or a concatenated string
-//@ containing the files if more than one file is given (a new line character is
-//@ introduced between each file).
+//@ Returns a [ShellString](#shellstringstr) containing the given file, or a
+//@ concatenated string containing the files if more than one file is given (a
+//@ new line character is introduced between each file).
 function _cat(options, files) {
   var cat = common.readFromPipe();
 
@@ -30,11 +37,40 @@ function _cat(options, files) {
   files.forEach(function (file) {
     if (!fs.existsSync(file)) {
       common.error('no such file or directory: ' + file);
+    } else if (common.statFollowLinks(file).isDirectory()) {
+      common.error(file + ': Is a directory');
     }
 
     cat += fs.readFileSync(file, 'utf8');
   });
 
+  if (options.number) {
+    cat = addNumbers(cat);
+  }
+
   return cat;
 }
 module.exports = _cat;
+
+function addNumbers(cat) {
+  var lines = cat.split('\n');
+  var lastLine = lines.pop();
+
+  lines = lines.map(function (line, i) {
+    return numberedLine(i + 1, line);
+  });
+
+  if (lastLine.length) {
+    lastLine = numberedLine(lines.length + 1, lastLine);
+  }
+  lines.push(lastLine);
+
+  return lines.join('\n');
+}
+
+function numberedLine(n, line) {
+  // GNU cat use six pad start number + tab. See http://lingrok.org/xref/coreutils/src/cat.c#57
+  // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/padStart
+  var number = ('     ' + n).slice(-6) + '\t';
+  return number + line;
+}
diff --git a/src/cd.js b/src/cd.js
index 634ed835c..1c6e73fff 100644
--- a/src/cd.js
+++ b/src/cd.js
@@ -1,14 +1,16 @@
-var fs = require('fs');
+var os = require('os');
 var common = require('./common');
 
 common.register('cd', _cd, {});
 
 //@
 //@ ### cd([dir])
+//@
 //@ Changes to directory `dir` for the duration of the script. Changes to home
-//@ directory if no argument is supplied.
+//@ directory if no argument is supplied. Returns a
+//@ [ShellString](#shellstringstr) to indicate success or failure.
 function _cd(options, dir) {
-  if (!dir) dir = common.getUserHome();
+  if (!dir) dir = os.homedir();
 
   if (dir === '-') {
     if (!process.env.OLDPWD) {
@@ -26,7 +28,7 @@ function _cd(options, dir) {
     // something went wrong, let's figure out the error
     var err;
     try {
-      fs.statSync(dir); // if this succeeds, it must be some sort of file
+      common.statFollowLinks(dir); // if this succeeds, it must be some sort of file
       err = 'not a directory: ' + dir;
     } catch (e2) {
       err = 'no such file or directory: ' + dir;
diff --git a/src/chmod.js b/src/chmod.js
index a1afd90e7..b930cc764 100644
--- a/src/chmod.js
+++ b/src/chmod.js
@@ -1,6 +1,6 @@
-var common = require('./common');
 var fs = require('fs');
 var path = require('path');
+var common = require('./common');
 
 var PERMS = (function (base) {
   return {
@@ -21,25 +21,25 @@ var PERMS = (function (base) {
     SETGID: parseInt('02000', 8),
     SETUID: parseInt('04000', 8),
 
-    TYPE_MASK: parseInt('0770000', 8)
+    TYPE_MASK: parseInt('0770000', 8),
   };
 }({
   EXEC: 1,
   WRITE: 2,
-  READ: 4
+  READ: 4,
 }));
 
 common.register('chmod', _chmod, {
 });
 
 //@
-//@ ### chmod(octal_mode || octal_string, file)
-//@ ### chmod(symbolic_mode, file)
+//@ ### chmod([options,] octal_mode || octal_string, file)
+//@ ### chmod([options,] symbolic_mode, file)
 //@
 //@ Available options:
 //@
 //@ + `-v`: output a diagnostic for every file processed//@
-//@ + `-c`: like verbose but report only when a change is made//@
+//@ + `-c`: like verbose, but report only when a change is made//@
 //@ + `-R`: change files and directories recursively//@
 //@
 //@ Examples:
@@ -48,6 +48,7 @@ common.register('chmod', _chmod, {
 //@ chmod(755, '/Users/brandon');
 //@ chmod('755', '/Users/brandon'); // same as above
 //@ chmod('u+x', '/Users/brandon');
+//@ chmod('-R', 'a-w', '/Users/brandon');
 //@ ```
 //@
 //@ Alters the permissions of a file or directory by either specifying the
@@ -55,9 +56,15 @@ common.register('chmod', _chmod, {
 //@ This command tries to mimic the POSIX behavior as much as possible.
 //@ Notable exceptions:
 //@
-//@ + In symbolic modes, 'a-r' and '-r' are identical.  No consideration is
-//@   given to the umask.
-//@ + There is no "quiet" option since default behavior is to run silent.
+//@ + In symbolic modes, `a-r` and `-r` are identical.  No consideration is
+//@   given to the `umask`.
+//@ + There is no "quiet" option, since default behavior is to run silent.
+//@ + Windows OS uses a very different permission model than POSIX. `chmod()`
+//@   does its best on Windows, but there are limits to how file permissions can
+//@   be set. Note that WSL (Windows subsystem for Linux) **does** follow POSIX,
+//@   so cross-platform compatibility should not be a concern there.
+//@
+//@ Returns a [ShellString](#shellstringstr) indicating success or failure.
 function _chmod(options, mode, filePattern) {
   if (!filePattern) {
     if (options.length > 0 && options.charAt(0) === '-') {
@@ -73,7 +80,7 @@ function _chmod(options, mode, filePattern) {
   options = common.parseOptions(options, {
     'R': 'recursive',
     'c': 'changes',
-    'v': 'verbose'
+    'v': 'verbose',
   });
 
   filePattern = [].slice.call(arguments, 2);
@@ -84,7 +91,7 @@ function _chmod(options, mode, filePattern) {
   if (options.recursive) {
     files = [];
     filePattern.forEach(function addFile(expandedFile) {
-      var stat = fs.lstatSync(expandedFile);
+      var stat = common.statNoFollowLinks(expandedFile);
 
       if (!stat.isSymbolicLink()) {
         files.push(expandedFile);
@@ -107,21 +114,21 @@ function _chmod(options, mode, filePattern) {
     }
 
     // When recursing, don't follow symlinks.
-    if (options.recursive && fs.lstatSync(file).isSymbolicLink()) {
+    if (options.recursive && common.statNoFollowLinks(file).isSymbolicLink()) {
       return;
     }
 
-    var stat = fs.statSync(file);
+    var stat = common.statFollowLinks(file);
     var isDir = stat.isDirectory();
     var perms = stat.mode;
     var type = perms & PERMS.TYPE_MASK;
 
     var newPerms = perms;
 
-    if (isNaN(parseInt(mode, 8))) {
+    if (Number.isNaN(parseInt(mode, 8))) {
       // parse options
       mode.split(',').forEach(function (symbolicMode) {
-        var pattern = /([ugoa]*)([=\+-])([rwxXst]*)/i;
+        var pattern = /([ugoa]*)([=+-])([rwxXst]*)/i;
         var matches = pattern.exec(symbolicMode);
 
         if (matches) {
@@ -129,16 +136,16 @@ function _chmod(options, mode, filePattern) {
           var operator = matches[2];
           var change = matches[3];
 
-          var changeOwner = applyTo.indexOf('u') !== -1 || applyTo === 'a' || applyTo === '';
-          var changeGroup = applyTo.indexOf('g') !== -1 || applyTo === 'a' || applyTo === '';
-          var changeOther = applyTo.indexOf('o') !== -1 || applyTo === 'a' || applyTo === '';
+          var changeOwner = applyTo.includes('u') || applyTo === 'a' || applyTo === '';
+          var changeGroup = applyTo.includes('g') || applyTo === 'a' || applyTo === '';
+          var changeOther = applyTo.includes('o') || applyTo === 'a' || applyTo === '';
 
-          var changeRead = change.indexOf('r') !== -1;
-          var changeWrite = change.indexOf('w') !== -1;
-          var changeExec = change.indexOf('x') !== -1;
-          var changeExecDir = change.indexOf('X') !== -1;
-          var changeSticky = change.indexOf('t') !== -1;
-          var changeSetuid = change.indexOf('s') !== -1;
+          var changeRead = change.includes('r');
+          var changeWrite = change.includes('w');
+          var changeExec = change.includes('x');
+          var changeExecDir = change.includes('X');
+          var changeSticky = change.includes('t');
+          var changeSetuid = change.includes('s');
 
           if (changeExecDir && isDir) {
             changeExec = true;
@@ -174,7 +181,7 @@ function _chmod(options, mode, filePattern) {
 
               // According to POSIX, when using = to explicitly set the
               // permissions, setuid and setgid can never be cleared.
-              if (fs.statSync(file).isDirectory()) {
+              if (common.statFollowLinks(file).isDirectory()) {
                 newPerms |= (PERMS.SETUID + PERMS.SETGID) & perms;
               }
               break;
@@ -203,7 +210,7 @@ function _chmod(options, mode, filePattern) {
 
       // POSIX rules are that setuid and setgid can only be added using numeric
       // form, but not cleared.
-      if (fs.statSync(file).isDirectory()) {
+      if (common.statFollowLinks(file).isDirectory()) {
         newPerms |= (PERMS.SETUID + PERMS.SETGID) & perms;
       }
 
diff --git a/src/cmd.js b/src/cmd.js
new file mode 100644
index 000000000..a00d6c497
--- /dev/null
+++ b/src/cmd.js
@@ -0,0 +1,138 @@
+var execa = require('execa');
+var common = require('./common');
+
+var DEFAULT_MAXBUFFER_SIZE = 20 * 1024 * 1024;
+var COMMAND_NOT_FOUND_ERROR_CODE = 127;
+
+common.register('cmd', _cmd, {
+  cmdOptions: null,
+  globStart: 1,
+  canReceivePipe: true,
+  wrapOutput: true,
+});
+
+function isCommandNotFound(execaResult) {
+  if (process.platform === 'win32') {
+    var str = 'is not recognized as an internal or external command';
+    return execaResult.exitCode && execaResult.stderr.includes(str);
+  }
+  return execaResult.failed && execaResult.code === 'ENOENT';
+}
+
+function isExecaInternalError(result) {
+  if (typeof result.stdout !== 'string') return true;
+  if (typeof result.stderr !== 'string') return true;
+  if (typeof result.exitCode !== 'number') return true;
+  if (result.exitCode === 0 && result.failed) return true;
+  // Otherwise assume this executed correctly. The command may still have exited
+  // with non-zero status, but that's not due to anything execa did.
+  return false;
+}
+
+//@
+//@ ### cmd(arg1[, arg2, ...] [, options])
+//@
+//@ Available options:
+//@
+//@ + `cwd: directoryPath`: change the current working directory only for this
+//@   cmd() invocation.
+//@ + `maxBuffer: num`: Raise or decrease the default buffer size for
+//@   stdout/stderr.
+//@ + `timeout`: Change the default timeout.
+//@
+//@ Examples:
+//@
+//@ ```javascript
+//@ var version = cmd('node', '--version').stdout;
+//@ cmd('git', 'commit', '-am', `Add suport for node ${version}`);
+//@ console.log(cmd('echo', '1st arg', '2nd arg', '3rd arg').stdout)
+//@ console.log(cmd('echo', 'this handles ;, |, &, etc. as literal characters').stdout)
+//@ ```
+//@
+//@ Executes the given command synchronously. This is intended as an easier
+//@ alternative for [exec()](#execcommand--options--callback), with better
+//@ security around globbing, comamnd injection, and variable expansion. This is
+//@ guaranteed to only run one external command, and won't give special
+//@ treatment for any shell characters (ex. this treats `|` as a literal
+//@ character, not as a shell pipeline).
+//@ This returns a [ShellString](#shellstringstr).
+//@
+//@ By default, this performs globbing on all platforms, but you can disable
+//@ this with `set('-f')`.
+//@
+//@ This **does not** support asynchronous mode. If you need asynchronous
+//@ command execution, check out [execa](https://www.npmjs.com/package/execa) or
+//@ the node builtin `child_process.execFile()` instead.
+function _cmd(options, command, commandArgs, userOptions) {
+  if (!command) {
+    common.error('Must specify a non-empty string as a command');
+  }
+
+  // `options` will usually not have a value: it's added by our commandline flag
+  // parsing engine.
+  commandArgs = [].slice.call(arguments, 2);
+
+  // `userOptions` may or may not be provided. We need to check the last
+  // argument. If it's an object, assume it's meant to be passed as
+  // userOptions (since ShellStrings are already flattened to strings).
+  if (commandArgs.length === 0) {
+    userOptions = {};
+  } else {
+    var lastArg = commandArgs.pop();
+    if (common.isObject(lastArg)) {
+      userOptions = lastArg;
+    } else {
+      userOptions = {};
+      commandArgs.push(lastArg);
+    }
+  }
+
+  var pipe = common.readFromPipe();
+
+  // Some of our defaults differ from execa's defaults. These can be overridden
+  // by the user.
+  var defaultOptions = {
+    maxBuffer: DEFAULT_MAXBUFFER_SIZE,
+    stripFinalNewline: false, // Preserve trailing newlines for consistency with unix.
+    reject: false, // Use ShellJS's error handling system.
+  };
+
+  // For other options, we forbid the user from overriding them (either for
+  // correctness or security).
+  var requiredOptions = {
+    input: pipe,
+    shell: false,
+  };
+
+  var execaOptions =
+    Object.assign(defaultOptions, userOptions, requiredOptions);
+
+  var result = execa.sync(command, commandArgs, execaOptions);
+  var stdout;
+  var stderr;
+  var code;
+  if (isCommandNotFound(result)) {
+    // This can happen if `command` is not an executable binary, or possibly
+    // under other conditions.
+    stdout = '';
+    stderr = "'" + command + "': command not found";
+    code = COMMAND_NOT_FOUND_ERROR_CODE;
+  } else if (isExecaInternalError(result)) {
+    // Catch-all: execa tried to run `command` but it encountered some error
+    // (ex. maxBuffer, timeout).
+    stdout = result.stdout || '';
+    stderr = result.stderr ||
+             `'${command}' encountered an error during execution`;
+    code = result.exitCode !== undefined && result.exitCode > 0 ? result.exitCode : 1;
+  } else {
+    // Normal exit: execa was able to execute `command` and get a return value.
+    stdout = result.stdout.toString();
+    stderr = result.stderr.toString();
+    code = result.exitCode;
+  }
+
+  // Pass `continue: true` so we can specify a value for stdout.
+  if (code) common.error(stderr, code, { silent: true, continue: true });
+  return new common.ShellString(stdout, stderr, code);
+}
+module.exports = _cmd;
diff --git a/src/common.js b/src/common.js
index 66b541a1e..d46e3c9b8 100644
--- a/src/common.js
+++ b/src/common.js
@@ -1,30 +1,19 @@
-// Ignore warning about 'new String()'
-/* eslint no-new-wrappers: 0 */
+// Ignore warning about 'new String()' and use of the Buffer constructor
+/* eslint no-new-wrappers: "off",
+   no-buffer-constructor: "off" */
+
 'use strict';
 
 var os = require('os');
 var fs = require('fs');
-var glob = require('glob');
-var shell = require('..');
+var glob = require('fast-glob');
 
-var shellMethods = Object.create(shell);
+var shell = {};
+exports.shell = shell;
 
-// objectAssign(target_obj, source_obj1 [, source_obj2 ...])
-// "Ponyfill" for Object.assign
-//    objectAssign({A:1}, {b:2}, {c:3}) returns {A:1, b:2, c:3}
-var objectAssign = typeof Object.assign === 'function' ?
-  Object.assign :
-  function objectAssign(target) {
-    var sources = [].slice.call(arguments, 1);
-    sources.forEach(function (source) {
-      Object.keys(source).forEach(function (key) {
-        target[key] = source[key];
-      });
-    });
+var shellMethods = Object.create(shell);
 
-    return target;
-  };
-exports.extend = objectAssign;
+exports.extend = Object.assign;
 
 // Check if we're running under electron
 var isElectron = Boolean(process.versions.electron);
@@ -38,16 +27,17 @@ var DEFAULT_CONFIG = {
   silent: false,
   verbose: false,
   execPath: null,
+  bufLength: 64 * 1024, // 64KB
 };
 
 var config = {
-  reset: function () {
-    objectAssign(this, DEFAULT_CONFIG);
+  reset() {
+    Object.assign(this, DEFAULT_CONFIG);
     if (!isElectron) {
       this.execPath = process.execPath;
     }
   },
-  resetForTesting: function () {
+  resetForTesting() {
     this.reset();
     this.silent = true;
   },
@@ -56,30 +46,52 @@ var config = {
 config.reset();
 exports.config = config;
 
+// Note: commands should generally consider these as read-only values.
 var state = {
   error: null,
   errorCode: 0,
   currentCmd: 'shell.js',
-  tempDir: null
 };
 exports.state = state;
 
 delete process.env.OLDPWD; // initially, there's no previous directory
 
-var platform = os.type().match(/^Win/) ? 'win' : 'unix';
-exports.platform = platform;
-
-// This is populated by calls to commonl.wrap()
-var pipeMethods = [];
+// Reliably test if something is any sort of javascript object
+function isObject(a) {
+  return typeof a === 'object' && a !== null;
+}
+exports.isObject = isObject;
 
 function log() {
+  /* istanbul ignore next */
   if (!config.silent) {
     console.error.apply(console, arguments);
   }
 }
 exports.log = log;
 
-// Shows error message. Throws if config.fatal is true
+// Converts strings to be equivalent across all platforms. Primarily responsible
+// for making sure we use '/' instead of '\' as path separators, but this may be
+// expanded in the future if necessary
+function convertErrorOutput(msg) {
+  if (typeof msg !== 'string') {
+    throw new TypeError('input must be a string');
+  }
+  return msg.replace(/\\/g, '/');
+}
+exports.convertErrorOutput = convertErrorOutput;
+
+// An exception class to help propagate command errors (e.g., non-zero exit
+// status) up to the top-level. {@param value} should be a ShellString.
+class CommandError extends Error {
+  constructor(value) {
+    super(value.toString());
+    this.returnValue = value;
+  }
+}
+exports.CommandError = CommandError; // visible for testing
+
+// Shows error message. Throws if fatal is true (defaults to config.fatal, overridable with options.fatal)
 function error(msg, _code, options) {
   // Validate input
   if (typeof msg !== 'string') throw new Error('msg must be a string');
@@ -89,34 +101,36 @@ function error(msg, _code, options) {
     code: 1,
     prefix: state.currentCmd + ': ',
     silent: false,
+    fatal: config.fatal,
   };
 
-  if (typeof _code === 'number' && typeof options === 'object') {
+  if (typeof _code === 'number' && isObject(options)) {
     options.code = _code;
-  } else if (typeof _code === 'object') { // no 'code'
+  } else if (isObject(_code)) { // no 'code'
     options = _code;
   } else if (typeof _code === 'number') { // no 'options'
     options = { code: _code };
   } else if (typeof _code !== 'number') { // only 'msg'
     options = {};
   }
-  options = objectAssign({}, DEFAULT_OPTIONS, options);
+  options = Object.assign({}, DEFAULT_OPTIONS, options);
 
   if (!state.errorCode) state.errorCode = options.code;
 
-  var logEntry = options.prefix + msg;
+  var logEntry = convertErrorOutput(options.prefix + msg);
   state.error = state.error ? state.error + '\n' : '';
   state.error += logEntry;
 
   // Throw an error, or log the entry
-  if (config.fatal) throw new Error(logEntry);
+  if (options.fatal) {
+    var err = new Error(logEntry);
+    err.code = options.code;
+    throw err;
+  }
   if (msg.length > 0 && !options.silent) log(logEntry);
 
   if (!options.continue) {
-    throw {
-      msg: 'earlyExit',
-      retValue: (new ShellString('', state.error, state.errorCode))
-    };
+    throw new CommandError(new ShellString('', state.error, state.errorCode));
   }
 }
 exports.error = error;
@@ -127,11 +141,19 @@ exports.error = error;
 //@ Examples:
 //@
 //@ ```javascript
-//@ var foo = ShellString('hello world');
+//@ var foo = new ShellString('hello world');
 //@ ```
 //@
-//@ Turns a regular string into a string-like object similar to what each
-//@ command returns. This has special methods, like `.to()` and `.toEnd()`
+//@ This is a dedicated type returned by most ShellJS methods, which wraps a
+//@ string (or array) value. This has all the string (or array) methods, but
+//@ also exposes extra methods: [`.to()`](#shellstringprototypetofile),
+//@ [`.toEnd()`](#shellstringprototypetoendfile), and all the pipe-able methods
+//@ (ex. `.cat()`, `.grep()`, etc.). This can be easily converted into a string
+//@ by calling `.toString()`.
+//@
+//@ This type also exposes the corresponding command's stdout, stderr, and
+//@ return status code via the `.stdout` (string), `.stderr` (string), and
+//@ `.code` (number) properties respectively.
 function ShellString(stdout, stderr, code) {
   var that;
   if (stdout instanceof Array) {
@@ -154,40 +176,44 @@ function ShellString(stdout, stderr, code) {
 
 exports.ShellString = ShellString;
 
-// Return the home directory in a platform-agnostic way, with consideration for
-// older versions of node
-function getUserHome() {
-  var result;
-  if (os.homedir) {
-    result = os.homedir(); // node 3+
-  } else {
-    result = process.env[(process.platform === 'win32') ? 'USERPROFILE' : 'HOME'];
-  }
-  return result;
-}
-exports.getUserHome = getUserHome;
-
 // Returns {'alice': true, 'bob': false} when passed a string and dictionary as follows:
 //   parseOptions('-a', {'a':'alice', 'b':'bob'});
 // Returns {'reference': 'string-value', 'bob': false} when passed two dictionaries of the form:
 //   parseOptions({'-r': 'string-value'}, {'r':'reference', 'b':'bob'});
+// Throws an error when passed a string that does not start with '-':
+//   parseOptions('a', {'a':'alice'}); // throws
 function parseOptions(opt, map, errorOptions) {
-  if (!map) error('parseOptions() internal error: no map given');
+  errorOptions = errorOptions || {};
+  // Validate input
+  if (typeof opt !== 'string' && !isObject(opt)) {
+    throw new TypeError('options must be strings or key-value pairs');
+  } else if (!isObject(map)) {
+    throw new TypeError('parseOptions() internal error: map must be an object');
+  } else if (!isObject(errorOptions)) {
+    throw new TypeError(
+        'parseOptions() internal error: errorOptions must be object',
+    );
+  }
+
+  if (opt === '--') {
+    // This means there are no options.
+    return {};
+  }
 
   // All options are false by default
   var options = {};
   Object.keys(map).forEach(function (letter) {
-    if (map[letter][0] !== '!') {
-      options[map[letter]] = false;
+    var optName = map[letter];
+    if (optName[0] !== '!') {
+      options[optName] = false;
     }
   });
 
-  if (!opt) return options; // defaults
+  if (opt === '') return options; // defaults
 
-  var optionName;
   if (typeof opt === 'string') {
     if (opt[0] !== '-') {
-      return options;
+      throw new Error("Options string must start with a '-'");
     }
 
     // e.g. chars = ['R', 'f']
@@ -195,40 +221,111 @@ function parseOptions(opt, map, errorOptions) {
 
     chars.forEach(function (c) {
       if (c in map) {
-        optionName = map[c];
+        var optionName = map[c];
         if (optionName[0] === '!') {
           options[optionName.slice(1)] = false;
         } else {
           options[optionName] = true;
         }
-      } else if (typeof errorOptions === 'object') {
-        error('option not recognized: ' + c, errorOptions);
       } else {
-        error('option not recognized: ' + c);
+        error('option not recognized: ' + c, errorOptions);
       }
     });
-  } else if (typeof opt === 'object') {
+  } else { // opt is an Object
     Object.keys(opt).forEach(function (key) {
-      // key is a string of the form '-r', '-d', etc.
-      var c = key[1];
-      if (c in map) {
-        optionName = map[c];
-        options[optionName] = opt[key]; // assign the given value
-      } else if (typeof errorOptions === 'object') {
-        error('option not recognized: ' + c, errorOptions);
+      if (key[0] === '-') {
+        // key is a string of the form '-r', '-d', etc.
+        var c = key[1];
+        if (c in map) {
+          var optionName = map[c];
+          options[optionName] = opt[key]; // assign the given value
+        } else {
+          error('option not recognized: ' + c, errorOptions);
+        }
+      } else if (key in options) {
+        // key is a "long option", so it should be the same
+        options[key] = opt[key];
       } else {
-        error('option not recognized: ' + c);
+        error('option not recognized: {' + key + ':...}', errorOptions);
       }
     });
-  } else if (typeof errorOptions === 'object') {
-    error('options must be strings or key-value pairs', errorOptions);
-  } else {
-    error('options must be strings or key-value pairs');
   }
   return options;
 }
 exports.parseOptions = parseOptions;
 
+function globOptions() {
+  // These options are just to make fast-glob be compatible with POSIX (bash)
+  // wildcard behavior.
+  var defaultGlobOptions = {
+    onlyFiles: false,
+    followSymbolicLinks: false,
+  };
+
+  var newGlobOptions = Object.assign({}, config.globOptions);
+  var optionRenames = {
+    // node-glob's 'nodir' is not quote the same as fast-glob's 'onlyFiles'.
+    // Compatibility for this is implemented at the call site.
+    mark: 'markDirectories',
+    matchBase: 'baseNameMatch',
+  };
+  Object.keys(optionRenames).forEach(function (oldKey) {
+    var newKey = optionRenames[oldKey];
+    if (oldKey in config.globOptions) {
+      newGlobOptions[newKey] = config.globOptions[oldKey];
+    }
+  });
+  var invertedOptionRenames = {
+    nobrace: 'braceExpansion',
+    noglobstar: 'globstar',
+    noext: 'extglob',
+    nocase: 'caseSensitiveMatch',
+  };
+  Object.keys(invertedOptionRenames).forEach(function (oldKey) {
+    var newKey = invertedOptionRenames[oldKey];
+    if (oldKey in config.globOptions) {
+      newGlobOptions[newKey] = !config.globOptions[oldKey];
+    }
+  });
+  return Object.assign({}, defaultGlobOptions, newGlobOptions);
+}
+
+
+// Workaround for https://github.com/shelljs/shelljs/issues/1197
+// fast-glob's dependency glob-parent does not recognize the '?' wildcard in
+// non-final path segments, causing those patterns to be treated as literal
+// directory names. Replace standalone '?' with the equivalent character class
+// '[^/]' which glob-parent handles correctly.
+function convertQuestionMarkForGlob(pattern) {
+  if (pattern.indexOf('?') === -1) {
+    return pattern;
+  }
+  var result = '';
+  var inBracket = false;
+  for (var i = 0; i < pattern.length; i++) {
+    var ch = pattern[i];
+    if (ch === '\\' && i + 1 < pattern.length) {
+      // Escaped character: keep as-is
+      result += ch + pattern[i + 1];
+      i++;
+    } else if (ch === '[' && !inBracket) {
+      inBracket = true;
+      result += ch;
+    } else if (ch === ']' && inBracket) {
+      inBracket = false;
+      result += ch;
+    } else if (ch === '?' && !inBracket && pattern[i + 1] === '(') {
+      // Extglob pattern ?(...)  keep as-is
+      result += ch;
+    } else if (ch === '?' && !inBracket) {
+      result += '[^/]';
+    } else {
+      result += ch;
+    }
+  }
+  return result;
+}
+
 // Expands wildcards with matching (ie. existing) file names.
 // For example:
 //   expand(['file*.js']) = ['file1.js', 'file2.js', ...]
@@ -243,15 +340,39 @@ function expand(list) {
     if (typeof listEl !== 'string') {
       expanded.push(listEl);
     } else {
-      var ret = glob.sync(listEl, config.globOptions);
-      // if glob fails, interpret the string literally
-      expanded = expanded.concat(ret.length > 0 ? ret : [listEl]);
+      var ret;
+      var globOpts = globOptions();
+      try {
+        ret = glob.sync(convertQuestionMarkForGlob(listEl), globOpts);
+      } catch (e) {
+        // if glob fails, interpret the string literally
+        ret = [listEl];
+      }
+      // if nothing matched, interpret the string literally
+      ret = ret.length > 0 ? ret.sort() : [listEl];
+      if (globOpts.nodir) {
+        ret = ret.filter(function (file) {
+          return !statNoFollowLinks(file).isDirectory();
+        });
+      }
+      expanded = expanded.concat(ret);
     }
   });
   return expanded;
 }
 exports.expand = expand;
 
+// Normalizes Buffer creation, using Buffer.alloc if possible.
+// Also provides a good default buffer length for most use cases.
+var buffer = typeof Buffer.alloc === 'function' ?
+  function (len) {
+    return Buffer.alloc(len || config.bufLength);
+  } :
+  function (len) {
+    return new Buffer(len || config.bufLength);
+  };
+exports.buffer = buffer;
+
 // Normalizes _unlinkSync() across platforms to match Unix behavior, i.e.
 // file can be unlinked even if it's read-only, see https://github.com/joyent/node/issues/3006
 function unlinkSync(file) {
@@ -259,6 +380,7 @@ function unlinkSync(file) {
     fs.unlinkSync(file);
   } catch (e) {
     // Try to override file permission
+    /* istanbul ignore next */
     if (e.code === 'EPERM') {
       fs.chmodSync(file, '0666');
       fs.unlinkSync(file);
@@ -269,6 +391,18 @@ function unlinkSync(file) {
 }
 exports.unlinkSync = unlinkSync;
 
+// wrappers around common.statFollowLinks and common.statNoFollowLinks that clarify intent
+// and improve readability
+function statFollowLinks() {
+  return fs.statSync.apply(fs, arguments);
+}
+exports.statFollowLinks = statFollowLinks;
+
+function statNoFollowLinks() {
+  return fs.lstatSync.apply(fs, arguments);
+}
+exports.statNoFollowLinks = statNoFollowLinks;
+
 // e.g. 'shelljs_a5f185d0443ca...'
 function randomFileName() {
   function randomHash(count) {
@@ -290,9 +424,6 @@ exports.randomFileName = randomFileName;
 // command-logging, and other nice things
 function wrap(cmd, fn, options) {
   options = options || {};
-  if (options.canReceivePipe) {
-    pipeMethods.push(cmd);
-  }
   return function () {
     var retValue = null;
 
@@ -315,7 +446,7 @@ function wrap(cmd, fn, options) {
       if (options.unix === false) { // this branch is for exec()
         retValue = fn.apply(this, args);
       } else { // and this branch is for everything else
-        if (args[0] instanceof Object && args[0].constructor.name === 'Object') {
+        if (isObject(args[0]) && args[0].constructor.name === 'Object') {
           // a no-op, allowing the syntax `touch({'-r': file}, ...)`
         } else if (args.length === 0 || typeof args[0] !== 'string' || args[0].length <= 1 || args[0][0] !== '-') {
           args.unshift(''); // only add dummy option if '-option' not already present
@@ -335,14 +466,14 @@ function wrap(cmd, fn, options) {
 
         // Convert ShellStrings (basically just String objects) to regular strings
         args = args.map(function (arg) {
-          if (arg instanceof Object && arg.constructor.name === 'String') {
+          if (isObject(arg) && arg.constructor.name === 'String') {
             return arg.toString();
           }
           return arg;
         });
 
         // Expand the '~' if appropriate
-        var homeDir = getUserHome();
+        var homeDir = os.homedir();
         args = args.map(function (arg) {
           if (typeof arg === 'string' && arg.slice(0, 2) === '~/' || arg === '~') {
             return arg.replace(/^~/, homeDir);
@@ -358,27 +489,28 @@ function wrap(cmd, fn, options) {
 
         try {
           // parse options if options are provided
-          if (typeof options.cmdOptions === 'object') {
+          if (isObject(options.cmdOptions)) {
             args[0] = parseOptions(args[0], options.cmdOptions);
           }
 
           retValue = fn.apply(this, args);
         } catch (e) {
-          if (e.msg === 'earlyExit') {
-            retValue = e.retValue;
+          /* istanbul ignore else */
+          if (e instanceof CommandError) {
+            retValue = e.returnValue;
           } else {
             throw e; // this is probably a bug that should be thrown up the call stack
           }
         }
       }
     } catch (e) {
+      /* istanbul ignore next */
       if (!state.error) {
         // If state.error hasn't been set it's an error thrown by Node, not us - probably a bug...
-        console.error('ShellJS: internal error');
-        console.error(e.stack || e);
-        process.exit(1);
+        e.name = 'ShellJSInternalError';
+        throw e;
       }
-      if (config.fatal) throw e;
+      if (config.fatal || options.handlesFatalDynamically) throw e;
     }
 
     if (options.wrapOutput &&
@@ -402,22 +534,37 @@ exports.readFromPipe = _readFromPipe;
 var DEFAULT_WRAP_OPTIONS = {
   allowGlobbing: true,
   canReceivePipe: false,
-  cmdOptions: false,
+  cmdOptions: null,
   globStart: 1,
+  handlesFatalDynamically: false,
   pipeOnly: false,
-  unix: true,
   wrapOutput: true,
-  overWrite: false,
+  unix: true,
 };
 
+// This is populated during plugin registration
+var pipeMethods = [];
+
 // Register a new ShellJS command
 function _register(name, implementation, wrapOptions) {
   wrapOptions = wrapOptions || {};
+
+  // Validate options
+  Object.keys(wrapOptions).forEach(function (option) {
+    if (!DEFAULT_WRAP_OPTIONS.hasOwnProperty(option)) {
+      throw new Error("Unknown option '" + option + "'");
+    }
+    if (typeof wrapOptions[option] !== typeof DEFAULT_WRAP_OPTIONS[option]) {
+      throw new TypeError("Unsupported type '" + typeof wrapOptions[option] +
+        "' for option '" + option + "'");
+    }
+  });
+
   // If an option isn't specified, use the default
-  wrapOptions = objectAssign({}, DEFAULT_WRAP_OPTIONS, wrapOptions);
+  wrapOptions = Object.assign({}, DEFAULT_WRAP_OPTIONS, wrapOptions);
 
-  if (shell[name] && !wrapOptions.overWrite) {
-    throw new Error('unable to overwrite `' + name + '` command');
+  if (shell.hasOwnProperty(name)) {
+    throw new Error('Command `' + name + '` already exists');
   }
 
   if (wrapOptions.pipeOnly) {
@@ -426,5 +573,9 @@ function _register(name, implementation, wrapOptions) {
   } else {
     shell[name] = wrap(name, implementation, wrapOptions);
   }
+
+  if (wrapOptions.canReceivePipe) {
+    pipeMethods.push(name);
+  }
 }
 exports.register = _register;
diff --git a/src/cp.js b/src/cp.js
index 111e031c9..abed9a987 100644
--- a/src/cp.js
+++ b/src/cp.js
@@ -1,7 +1,6 @@
 var fs = require('fs');
 var path = require('path');
 var common = require('./common');
-var os = require('os');
 
 common.register('cp', _cp, {
   cmdOptions: {
@@ -12,6 +11,7 @@ common.register('cp', _cp, {
     'r': 'recursive',
     'L': 'followsymlink',
     'P': 'noFollowsymlink',
+    'p': 'preserve',
   },
   wrapOutput: false,
 });
@@ -24,55 +24,71 @@ function copyFileSync(srcFile, destFile, options) {
     common.error('copyFileSync: no such file or directory: ' + srcFile);
   }
 
+  // Bail if src and dest are the same file to avoid data loss
+  if (path.relative(srcFile, destFile) === '') {
+    common.error("'" + destFile + "' and '" + srcFile + "' are the same file", { continue: true });
+    return;
+  }
+
+  var isWindows = process.platform === 'win32';
+
   // Check the mtimes of the files if the '-u' flag is provided
   try {
-    if (options.update && fs.statSync(srcFile).mtime < fs.statSync(destFile).mtime) {
+    if (options.update && common.statFollowLinks(srcFile).mtime < fs.statSync(destFile).mtime) {
       return;
     }
   } catch (e) {
     // If we're here, destFile probably doesn't exist, so just do a normal copy
   }
 
-  if (fs.lstatSync(srcFile).isSymbolicLink() && !options.followsymlink) {
+  if (common.statNoFollowLinks(srcFile).isSymbolicLink() && !options.followsymlink) {
     try {
-      fs.lstatSync(destFile);
+      common.statNoFollowLinks(destFile);
       common.unlinkSync(destFile); // re-link it
     } catch (e) {
       // it doesn't exist, so no work needs to be done
     }
 
     var symlinkFull = fs.readlinkSync(srcFile);
-    fs.symlinkSync(symlinkFull, destFile, os.platform() === 'win32' ? 'junction' : null);
+    fs.symlinkSync(symlinkFull, destFile, isWindows ? 'junction' : null);
   } else {
-    var BUF_LENGTH = 64 * 1024;
-    var buf = new Buffer(BUF_LENGTH);
-    var bytesRead = BUF_LENGTH;
+    var buf = common.buffer();
+    var bufLength = buf.length;
+    var bytesRead = bufLength;
     var pos = 0;
     var fdr = null;
     var fdw = null;
+    var srcStat = common.statFollowLinks(srcFile);
 
     try {
       fdr = fs.openSync(srcFile, 'r');
     } catch (e) {
+      /* istanbul ignore next */
       common.error('copyFileSync: could not read src file (' + srcFile + ')');
     }
 
     try {
-      fdw = fs.openSync(destFile, 'w');
+      fdw = fs.openSync(destFile, 'w', srcStat.mode);
     } catch (e) {
+      /* istanbul ignore next */
       common.error('copyFileSync: could not write to dest file (code=' + e.code + '):' + destFile);
     }
 
-    while (bytesRead === BUF_LENGTH) {
-      bytesRead = fs.readSync(fdr, buf, 0, BUF_LENGTH, pos);
+    while (bytesRead === bufLength) {
+      bytesRead = fs.readSync(fdr, buf, 0, bufLength, pos);
       fs.writeSync(fdw, buf, 0, bytesRead);
       pos += bytesRead;
     }
 
+    if (options.preserve) {
+      fs.fchownSync(fdw, srcStat.uid, srcStat.gid);
+      // Note: utimesSync does not work (rounds to seconds), but futimesSync has
+      // millisecond precision.
+      fs.futimesSync(fdw, srcStat.atime, srcStat.mtime);
+    }
+
     fs.closeSync(fdr);
     fs.closeSync(fdw);
-
-    fs.chmodSync(destFile, fs.statSync(srcFile).mode);
   }
 }
 
@@ -91,11 +107,13 @@ function cpdirSyncRecursive(sourceDir, destDir, currentDepth, opts) {
   if (currentDepth >= common.config.maxdepth) return;
   currentDepth++;
 
-  // Create the directory where all our junk is moving to; read the mode of the
-  // source directory and mirror it
+  var isWindows = process.platform === 'win32';
+
+  // Create the directory where all our junk is moving to; read the mode/etc. of
+  // the source directory (we'll set this on the destDir at the end).
+  var checkDir = common.statFollowLinks(sourceDir);
   try {
-    var checkDir = fs.statSync(sourceDir);
-    fs.mkdirSync(destDir, checkDir.mode);
+    fs.mkdirSync(destDir);
   } catch (e) {
     // if the directory already exists, that's okay
     if (e.code !== 'EEXIST') throw e;
@@ -106,7 +124,7 @@ function cpdirSyncRecursive(sourceDir, destDir, currentDepth, opts) {
   for (var i = 0; i < files.length; i++) {
     var srcFile = sourceDir + '/' + files[i];
     var destFile = destDir + '/' + files[i];
-    var srcFileStat = fs.lstatSync(srcFile);
+    var srcFileStat = common.statNoFollowLinks(srcFile);
 
     var symlinkFull;
     if (opts.followsymlink) {
@@ -114,7 +132,7 @@ function cpdirSyncRecursive(sourceDir, destDir, currentDepth, opts) {
         // Cycle link found.
         console.error('Cycle link found.');
         symlinkFull = fs.readlinkSync(srcFile);
-        fs.symlinkSync(symlinkFull, destFile, os.platform() === 'win32' ? 'junction' : null);
+        fs.symlinkSync(symlinkFull, destFile, isWindows ? 'junction' : null);
         continue;
       }
     }
@@ -124,32 +142,45 @@ function cpdirSyncRecursive(sourceDir, destDir, currentDepth, opts) {
     } else if (srcFileStat.isSymbolicLink() && !opts.followsymlink) {
       symlinkFull = fs.readlinkSync(srcFile);
       try {
-        fs.lstatSync(destFile);
+        common.statNoFollowLinks(destFile);
         common.unlinkSync(destFile); // re-link it
       } catch (e) {
         // it doesn't exist, so no work needs to be done
       }
-      fs.symlinkSync(symlinkFull, destFile, os.platform() === 'win32' ? 'junction' : null);
+      fs.symlinkSync(symlinkFull, destFile, isWindows ? 'junction' : null);
     } else if (srcFileStat.isSymbolicLink() && opts.followsymlink) {
-      srcFileStat = fs.statSync(srcFile);
+      srcFileStat = common.statFollowLinks(srcFile);
       if (srcFileStat.isDirectory()) {
         cpdirSyncRecursive(srcFile, destFile, currentDepth, opts);
       } else {
         copyFileSync(srcFile, destFile, opts);
       }
+    } else if (fs.existsSync(destFile) && opts.no_force) {
+      common.log('skipping existing file: ' + files[i]);
     } else {
-      /* At this point, we've hit a file actually worth copying... so copy it on over. */
-      if (fs.existsSync(destFile) && opts.no_force) {
-        common.log('skipping existing file: ' + files[i]);
-      } else {
-        copyFileSync(srcFile, destFile, opts);
-      }
+      copyFileSync(srcFile, destFile, opts);
     }
   } // for files
+
+  // finally change the mode for the newly created directory (otherwise, we
+  // couldn't add files to a read-only directory).
+  // var checkDir = common.statFollowLinks(sourceDir);
+  if (opts.preserve) {
+    fs.utimesSync(destDir, checkDir.atime, checkDir.mtime);
+  }
+  fs.chmodSync(destDir, checkDir.mode);
 } // cpdirSyncRecursive
 
+// Checks if cureent file was created recently
+function checkRecentCreated(sources, index) {
+  var lookedSource = sources[index];
+  return sources.slice(0, index).some(function (src) {
+    return path.basename(src) === path.basename(lookedSource);
+  });
+}
+
 function cpcheckcycle(sourceDir, srcFile) {
-  var srcFileStat = fs.lstatSync(srcFile);
+  var srcFileStat = common.statNoFollowLinks(srcFile);
   if (srcFileStat.isSymbolicLink()) {
     // Do cycle check. For example:
     //   $ mkdir -p 1/2/3/4
@@ -157,7 +188,7 @@ function cpcheckcycle(sourceDir, srcFile) {
     //   $ ln -s ../../3 link
     //   $ cd ../../../..
     //   $ cp -RL 1 copy
-    var cyclecheck = fs.statSync(srcFile);
+    var cyclecheck = common.statFollowLinks(srcFile);
     if (cyclecheck.isDirectory()) {
       var sourcerealpath = fs.realpathSync(sourceDir);
       var symlinkrealpath = fs.realpathSync(srcFile);
@@ -173,14 +204,16 @@ function cpcheckcycle(sourceDir, srcFile) {
 //@
 //@ ### cp([options,] source [, source ...], dest)
 //@ ### cp([options,] source_array, dest)
+//@
 //@ Available options:
 //@
 //@ + `-f`: force (default behavior)
 //@ + `-n`: no-clobber
-//@ + `-u`: only copy if source is newer than dest
+//@ + `-u`: only copy if `source` is newer than `dest`
 //@ + `-r`, `-R`: recursive
 //@ + `-L`: follow symlinks
 //@ + `-P`: don't follow symlinks
+//@ + `-p`: preserve file mode, ownership, and timestamps
 //@
 //@ Examples:
 //@
@@ -191,7 +224,8 @@ function cpcheckcycle(sourceDir, srcFile) {
 //@ cp('-Rf', ['/tmp/*', '/usr/local/*'], '/home/tmp'); // same as above
 //@ ```
 //@
-//@ Copies files.
+//@ Copies files. Returns a [ShellString](#shellstringstr) indicating success
+//@ or failure.
 function _cp(options, sources, dest) {
   // If we're missing -R, it actually implies -L (unless -P is explicit)
   if (options.followsymlink) {
@@ -210,7 +244,7 @@ function _cp(options, sources, dest) {
   }
 
   var destExists = fs.existsSync(dest);
-  var destStat = destExists && fs.statSync(dest);
+  var destStat = destExists && common.statFollowLinks(dest);
 
   // Dest is not existing dir, but multiple sources given
   if ((!destExists || !destStat.isDirectory()) && sources.length > 1) {
@@ -222,12 +256,13 @@ function _cp(options, sources, dest) {
     return new common.ShellString('', '', 0);
   }
 
-  sources.forEach(function (src) {
+  sources.forEach(function (src, srcIndex) {
     if (!fs.existsSync(src)) {
+      if (src === '') src = "''"; // if src was empty string, display empty string
       common.error('no such file or directory: ' + src, { continue: true });
       return; // skip file
     }
-    var srcStat = fs.statSync(src);
+    var srcStat = common.statFollowLinks(src);
     if (!options.noFollowsymlink && srcStat.isDirectory()) {
       if (!options.recursive) {
         // Non-Recursive
@@ -239,10 +274,17 @@ function _cp(options, sources, dest) {
             path.join(dest, path.basename(src)) :
             dest;
 
+        if (path.relative(src, newDest) === '') {
+          // a directory cannot be copied into itself, but we want to continue copying other sources
+          common.error("'" + newDest + "' and '" + src + "' are the same file", { continue: true });
+          return;
+        }
+
         try {
-          fs.statSync(path.dirname(dest));
-          cpdirSyncRecursive(src, newDest, 0, { no_force: options.no_force, followsymlink: options.followsymlink });
+          common.statFollowLinks(path.dirname(dest));
+          cpdirSyncRecursive(src, newDest, 0, options);
         } catch (e) {
+          /* istanbul ignore next */
           common.error("cannot create directory '" + dest + "': No such file or directory");
         }
       }
@@ -256,13 +298,23 @@ function _cp(options, sources, dest) {
         thisDest = path.normalize(dest + '/' + path.basename(src));
       }
 
-      if (fs.existsSync(thisDest) && options.no_force) {
+      var thisDestExists = fs.existsSync(thisDest);
+      if (thisDestExists && checkRecentCreated(sources, srcIndex)) {
+        // cannot overwrite file created recently in current execution, but we want to continue copying other files
+        if (!options.no_force) {
+          common.error("will not overwrite just-created '" + thisDest + "' with '" + src + "'", { continue: true });
+        }
+        return;
+      }
+
+      if (thisDestExists && options.no_force) {
         return; // skip file
       }
 
       copyFileSync(src, thisDest, options);
     }
   }); // forEach(src)
+
   return new common.ShellString('', common.state.error, common.state.errorCode);
 }
 module.exports = _cp;
diff --git a/src/dirs.js b/src/dirs.js
index cf5fe02f5..9b7251d0e 100644
--- a/src/dirs.js
+++ b/src/dirs.js
@@ -1,6 +1,6 @@
+var path = require('path');
 var common = require('./common');
 var _cd = require('./cd');
-var path = require('path');
 
 common.register('dirs', _dirs, {
   wrapOutput: false,
@@ -16,7 +16,7 @@ common.register('popd', _popd, {
 var _dirStack = [];
 
 function _isStackIndex(index) {
-  return (/^[\-+]\d+$/).test(index);
+  return (/^[-+]\d+$/).test(index);
 }
 
 function _parseStackIndex(index) {
@@ -40,10 +40,11 @@ function _actualDirStack() {
 //@ Available options:
 //@
 //@ + `-n`: Suppresses the normal change of directory when adding directories to the stack, so that only the stack is manipulated.
+//@ + `-q`: Suppresses output to the console.
 //@
 //@ Arguments:
 //@
-//@ + `dir`: Makes the current working directory be the top of the stack, and then executes the equivalent of `cd dir`.
+//@ + `dir`: Sets the current working directory to the top of the stack, then executes the equivalent of `cd dir`.
 //@ + `+N`: Brings the Nth directory (counting from the left of the list printed by dirs, starting with zero) to the top of the list by rotating the stack.
 //@ + `-N`: Brings the Nth directory (counting from the right of the list printed by dirs, starting with zero) to the top of the list by rotating the stack.
 //@
@@ -55,7 +56,7 @@ function _actualDirStack() {
 //@ pushd('+1');   // Returns /usr /etc
 //@ ```
 //@
-//@ Save the current directory on the top of the directory stack and then cd to `dir`. With no arguments, pushd exchanges the top two directories. Returns an array of paths in the stack.
+//@ Save the current directory on the top of the directory stack and then `cd` to `dir`. With no arguments, `pushd` exchanges the top two directories. Returns an array of paths in the stack.
 function _pushd(options, dir) {
   if (_isStackIndex(options)) {
     dir = options;
@@ -63,7 +64,8 @@ function _pushd(options, dir) {
   }
 
   options = common.parseOptions(options, {
-    'n': 'no-cd'
+    'n': 'no-cd',
+    'q': 'quiet',
   });
 
   var dirs = _actualDirStack();
@@ -79,12 +81,10 @@ function _pushd(options, dir) {
   } else if (_isStackIndex(dir)) {
     var n = _parseStackIndex(dir);
     dirs = dirs.slice(n).concat(dirs.slice(0, n));
+  } else if (options['no-cd']) {
+    dirs.splice(1, 0, dir);
   } else {
-    if (options['no-cd']) {
-      dirs.splice(1, 0, dir);
-    } else {
-      dirs.unshift(dir);
-    }
+    dirs.unshift(dir);
   }
 
   if (options['no-cd']) {
@@ -95,16 +95,18 @@ function _pushd(options, dir) {
   }
 
   _dirStack = dirs;
-  return _dirs('');
+  return _dirs(options.quiet ? '-q' : '');
 }
 exports.pushd = _pushd;
 
+//@
 //@
 //@ ### popd([options,] ['-N' | '+N'])
 //@
 //@ Available options:
 //@
-//@ + `-n`: Suppresses the normal change of directory when removing directories from the stack, so that only the stack is manipulated.
+//@ + `-n`: Suppress the normal directory change when removing directories from the stack, so that only the stack is manipulated.
+//@ + `-q`: Suppresses output to the console.
 //@
 //@ Arguments:
 //@
@@ -121,7 +123,7 @@ exports.pushd = _pushd;
 //@ echo(process.cwd()); // '/usr'
 //@ ```
 //@
-//@ When no arguments are given, popd removes the top directory from the stack and performs a cd to the new top directory. The elements are numbered from 0 starting at the first directory listed with dirs; i.e., popd is equivalent to popd +0. Returns an array of paths in the stack.
+//@ When no arguments are given, `popd` removes the top directory from the stack and performs a `cd` to the new top directory. The elements are numbered from 0, starting at the first directory listed with dirs (i.e., `popd` is equivalent to `popd +0`). Returns an array of paths in the stack.
 function _popd(options, index) {
   if (_isStackIndex(options)) {
     index = options;
@@ -129,7 +131,8 @@ function _popd(options, index) {
   }
 
   options = common.parseOptions(options, {
-    'n': 'no-cd'
+    'n': 'no-cd',
+    'q': 'quiet',
   });
 
   if (!_dirStack.length) {
@@ -146,25 +149,27 @@ function _popd(options, index) {
     _cd('', dir);
   }
 
-  return _dirs('');
+  return _dirs(options.quiet ? '-q' : '');
 }
 exports.popd = _popd;
 
+//@
 //@
 //@ ### dirs([options | '+N' | '-N'])
 //@
 //@ Available options:
 //@
 //@ + `-c`: Clears the directory stack by deleting all of the elements.
+//@ + `-q`: Suppresses output to the console.
 //@
 //@ Arguments:
 //@
 //@ + `+N`: Displays the Nth directory (counting from the left of the list printed by dirs when invoked without options), starting with zero.
 //@ + `-N`: Displays the Nth directory (counting from the right of the list printed by dirs when invoked without options), starting with zero.
 //@
-//@ Display the list of currently remembered directories. Returns an array of paths in the stack, or a single path if +N or -N was specified.
+//@ Display the list of currently remembered directories. Returns an array of paths in the stack, or a single path if `+N` or `-N` was specified.
 //@
-//@ See also: pushd, popd
+//@ See also: `pushd`, `popd`
 function _dirs(options, index) {
   if (_isStackIndex(options)) {
     index = options;
@@ -172,7 +177,8 @@ function _dirs(options, index) {
   }
 
   options = common.parseOptions(options, {
-    'c': 'clear'
+    'c': 'clear',
+    'q': 'quiet',
   });
 
   if (options.clear) {
@@ -189,11 +195,15 @@ function _dirs(options, index) {
       index = stack.length + index;
     }
 
-    common.log(stack[index]);
+    if (!options.quiet) {
+      common.log(stack[index]);
+    }
     return stack[index];
   }
 
-  common.log(stack.join(' '));
+  if (!options.quiet) {
+    common.log(stack.join(' '));
+  }
 
   return stack;
 }
diff --git a/src/echo.js b/src/echo.js
index 2b0e7d919..da37f438a 100644
--- a/src/echo.js
+++ b/src/echo.js
@@ -1,3 +1,5 @@
+var format = require('util').format;
+
 var common = require('./common');
 
 common.register('echo', _echo, {
@@ -6,29 +8,55 @@ common.register('echo', _echo, {
 
 //@
 //@ ### echo([options,] string [, string ...])
+//@
 //@ Available options:
 //@
 //@ + `-e`: interpret backslash escapes (default)
+//@ + `-n`: remove trailing newline from output
 //@
 //@ Examples:
 //@
 //@ ```javascript
 //@ echo('hello world');
 //@ var str = echo('hello world');
+//@ echo('-n', 'no newline at end');
 //@ ```
 //@
-//@ Prints string to stdout, and returns string with additional utility methods
-//@ like `.to()`.
-function _echo(opts, messages) {
+//@ Prints `string` to stdout, and returns a [ShellString](#shellstringstr).
+function _echo(opts) {
   // allow strings starting with '-', see issue #20
-  messages = [].slice.call(arguments, opts ? 0 : 1);
+  var messages = [].slice.call(arguments, opts ? 0 : 1);
+  var options = {};
+
+  // If the first argument starts with '-', parse it as options string.
+  // If parseOptions throws, it wasn't an options string.
+  try {
+    options = common.parseOptions(messages[0], {
+      'e': 'escapes',
+      'n': 'no_newline',
+    }, {
+      silent: true,
+    });
+
+    // Allow null to be echoed
+    if (messages[0]) {
+      messages.shift();
+    }
+  } catch (_) {
+    // Clear out error if an error occurred
+    common.state.error = null;
+  }
+
+  var output = format.apply(null, messages);
 
-  if (messages[0] === '-e') {
-    // ignore -e
-    messages.shift();
+  // Add newline if -n is not passed.
+  if (!options.no_newline) {
+    output += '\n';
   }
 
-  console.log.apply(console, messages);
-  return messages.join(' ');
+  process.stdout.write(output);
+
+  return output;
 }
+
 module.exports = _echo;
diff --git a/src/error.js b/src/error.js
index 507c86ddd..b0ed59e12 100644
--- a/src/error.js
+++ b/src/error.js
@@ -2,8 +2,9 @@ var common = require('./common');
 
 //@
 //@ ### error()
+//@
 //@ Tests if error occurred in the last command. Returns a truthy value if an
-//@ error returned and a falsy value otherwise.
+//@ error returned, or a falsy value otherwise.
 //@
 //@ **Note**: do not rely on the
 //@ return value to be an error message. If you need the last error message, use
diff --git a/src/errorCode.js b/src/errorCode.js
new file mode 100644
index 000000000..a1c7fd23f
--- /dev/null
+++ b/src/errorCode.js
@@ -0,0 +1,10 @@
+var common = require('./common');
+
+//@
+//@ ### errorCode()
+//@
+//@ Returns the error code from the last command.
+function errorCode() {
+  return common.state.errorCode;
+}
+module.exports = errorCode;
diff --git a/src/exec-child.js b/src/exec-child.js
new file mode 100644
index 000000000..e8446f6f0
--- /dev/null
+++ b/src/exec-child.js
@@ -0,0 +1,71 @@
+var childProcess = require('child_process');
+var fs = require('fs');
+
+function main() {
+  var paramFilePath = process.argv[2];
+
+  var serializedParams = fs.readFileSync(paramFilePath, 'utf8');
+  var params = JSON.parse(serializedParams);
+
+  var cmd = params.command;
+  var execOptions = params.execOptions;
+  var pipe = params.pipe;
+  var stdoutFile = params.stdoutFile;
+  var stderrFile = params.stderrFile;
+
+  function isMaxBufferError(err) {
+    var maxBufferErrorPattern = /^.*\bmaxBuffer\b.*exceeded.*$/;
+    if (err instanceof Error && err.message &&
+          err.message.match(maxBufferErrorPattern)) {
+      // < v10
+      // Error: stdout maxBuffer exceeded
+      return true;
+    } else if (err instanceof RangeError && err.message &&
+          err.message.match(maxBufferErrorPattern)) {
+      // >= v10
+      // RangeError [ERR_CHILD_PROCESS_STDIO_MAXBUFFER]: stdout maxBuffer length
+      // exceeded
+      return true;
+    }
+    return false;
+  }
+
+  var stdoutStream = fs.createWriteStream(stdoutFile);
+  var stderrStream = fs.createWriteStream(stderrFile);
+
+  function appendError(message, code) {
+    stderrStream.write(message);
+    process.exitCode = code;
+  }
+
+  var c = childProcess.exec(cmd, execOptions, function (err) {
+    if (!err) {
+      process.exitCode = 0;
+    } else if (isMaxBufferError(err)) {
+      appendError('maxBuffer exceeded', 1);
+    } else if (err.code === undefined && err.message) {
+      /* istanbul ignore next */
+      appendError(err.message, 1);
+    } else if (err.code === undefined) {
+      /* istanbul ignore next */
+      appendError('Unknown issue', 1);
+    } else {
+      process.exitCode = err.code;
+    }
+  });
+
+  c.stdout.pipe(stdoutStream);
+  c.stderr.pipe(stderrStream);
+  c.stdout.pipe(process.stdout);
+  c.stderr.pipe(process.stderr);
+
+  if (pipe) {
+    c.stdin.end(pipe);
+  }
+}
+
+// This file should only be executed. This module does not export anything.
+/* istanbul ignore else */
+if (require.main === module) {
+  main();
+}
diff --git a/src/exec.js b/src/exec.js
index 9c9128fea..0082f63ed 100644
--- a/src/exec.js
+++ b/src/exec.js
@@ -1,181 +1,139 @@
-var common = require('./common');
-var _tempDir = require('./tempdir');
-var _pwd = require('./pwd');
 var path = require('path');
 var fs = require('fs');
 var child = require('child_process');
+var common = require('./common');
+var _tempDir = require('./tempdir').tempDir;
+var _pwd = require('./pwd');
+
+// Resolve exec-child.js path at module load time using require.resolve() so that
+// bundlers (e.g. Next.js/webpack) do not break the path by replacing __dirname
+// with the bundled output directory. require.resolve() always returns the real
+// filesystem path of the module, regardless of bundler transformations.
+var EXEC_CHILD_PATH = require.resolve('./exec-child.js');
 
 var DEFAULT_MAXBUFFER_SIZE = 20 * 1024 * 1024;
+var DEFAULT_ERROR_CODE = 1;
 
 common.register('exec', _exec, {
   unix: false,
   canReceivePipe: true,
   wrapOutput: false,
+  handlesFatalDynamically: true,
 });
 
-// Hack to run child_process.exec() synchronously (sync avoids callback hell)
-// Uses a custom wait loop that checks for a flag file, created when the child process is done.
-// (Can't do a wait loop that checks for internal Node variables/messages as
-// Node is single-threaded; callbacks and other internal state changes are done in the
-// event loop).
+// We use this function to run `exec` synchronously while also providing realtime
+// output.
 function execSync(cmd, opts, pipe) {
   if (!common.config.execPath) {
-    common.error('Unable to find a path to the node binary. Please manually set config.execPath');
+    try {
+        common.error('Unable to find a path to the node binary. Please manually set config.execPath');
+    } catch (e) {
+      if (opts.fatal) {
+        throw e;
+      }
+
+      return;
+    }
   }
 
   var tempDir = _tempDir();
-  var stdoutFile = path.resolve(tempDir + '/' + common.randomFileName());
-  var stderrFile = path.resolve(tempDir + '/' + common.randomFileName());
-  var codeFile = path.resolve(tempDir + '/' + common.randomFileName());
-  var scriptFile = path.resolve(tempDir + '/' + common.randomFileName());
-  var sleepFile = path.resolve(tempDir + '/' + common.randomFileName());
+  var paramsFile = path.join(tempDir, common.randomFileName());
+  var stderrFile = path.join(tempDir, common.randomFileName());
+  var stdoutFile = path.join(tempDir, common.randomFileName());
 
   opts = common.extend({
     silent: common.config.silent,
+    fatal: common.config.fatal, // TODO(nfischer): this and the line above are probably unnecessary
     cwd: _pwd().toString(),
     env: process.env,
-    maxBuffer: DEFAULT_MAXBUFFER_SIZE
+    maxBuffer: DEFAULT_MAXBUFFER_SIZE,
+    encoding: 'utf8',
   }, opts);
 
-  var previousStdoutContent = '';
-  var previousStderrContent = '';
-  // Echoes stdout and stderr changes from running process, if not silent
-  function updateStream(streamFile) {
-    if (opts.silent || !fs.existsSync(streamFile)) {
-      return;
-    }
-
-    var previousStreamContent;
-    var procStream;
-    if (streamFile === stdoutFile) {
-      previousStreamContent = previousStdoutContent;
-      procStream = process.stdout;
-    } else { // assume stderr
-      previousStreamContent = previousStderrContent;
-      procStream = process.stderr;
-    }
-
-    var streamContent = fs.readFileSync(streamFile, 'utf8');
-    // No changes since last time?
-    if (streamContent.length <= previousStreamContent.length) {
-      return;
-    }
-
-    procStream.write(streamContent.substr(previousStreamContent.length));
-    previousStreamContent = streamContent;
-  }
-
-  if (fs.existsSync(scriptFile)) common.unlinkSync(scriptFile);
-  if (fs.existsSync(stdoutFile)) common.unlinkSync(stdoutFile);
+  if (fs.existsSync(paramsFile)) common.unlinkSync(paramsFile);
   if (fs.existsSync(stderrFile)) common.unlinkSync(stderrFile);
-  if (fs.existsSync(codeFile)) common.unlinkSync(codeFile);
-
-  var execCommand = JSON.stringify(common.config.execPath) + ' ' + JSON.stringify(scriptFile);
-  var script;
+  if (fs.existsSync(stdoutFile)) common.unlinkSync(stdoutFile);
 
   opts.cwd = path.resolve(opts.cwd);
-  var optString = JSON.stringify(opts);
-
-  if (typeof child.execSync === 'function') {
-    script = [
-      "var child = require('child_process')",
-      "  , fs = require('fs');",
-      'var childProcess = child.exec(' + JSON.stringify(cmd) + ', ' + optString + ', function(err) {',
-      '  var fname = ' + JSON.stringify(codeFile) + ';',
-      '  if (!err) {',
-      '    fs.writeFileSync(fname, "0");',
-      '  } else if (err.code === undefined) {',
-      '    fs.writeFileSync(fname, "1");',
-      '  } else {',
-      '    fs.writeFileSync(fname, err.code.toString());',
-      '  }',
-      '});',
-      'var stdoutStream = fs.createWriteStream(' + JSON.stringify(stdoutFile) + ');',
-      'var stderrStream = fs.createWriteStream(' + JSON.stringify(stderrFile) + ');',
-      'childProcess.stdout.pipe(stdoutStream, {end: false});',
-      'childProcess.stderr.pipe(stderrStream, {end: false});',
-      'childProcess.stdout.pipe(process.stdout);',
-      'childProcess.stderr.pipe(process.stderr);',
-    ].join('\n') +
-      (pipe ? '\nchildProcess.stdin.end(' + JSON.stringify(pipe) + ');\n' : '\n') +
-      [
-        'var stdoutEnded = false, stderrEnded = false;',
-        'function tryClosingStdout(){ if(stdoutEnded){ stdoutStream.end(); } }',
-        'function tryClosingStderr(){ if(stderrEnded){ stderrStream.end(); } }',
-        "childProcess.stdout.on('end', function(){ stdoutEnded = true; tryClosingStdout(); });",
-        "childProcess.stderr.on('end', function(){ stderrEnded = true; tryClosingStderr(); });",
-      ].join('\n');
-
-    fs.writeFileSync(scriptFile, script);
-
-    if (opts.silent) {
-      opts.stdio = 'ignore';
-    } else {
-      opts.stdio = [0, 1, 2];
-    }
 
-    // Welcome to the future
-    try {
-      child.execSync(execCommand, opts);
-    } catch (e) {
-      // Clean up immediately if we have an exception
-      try { common.unlinkSync(scriptFile); } catch (e2) {}
-      try { common.unlinkSync(stdoutFile); } catch (e2) {}
-      try { common.unlinkSync(stderrFile); } catch (e2) {}
-      try { common.unlinkSync(codeFile); } catch (e2) {}
-      throw e;
-    }
+  var paramsToSerialize = {
+    command: cmd,
+    execOptions: opts,
+    pipe,
+    stdoutFile,
+    stderrFile,
+  };
+
+  // Create the files and ensure these are locked down (for read and write) to
+  // the current user. The main concerns here are:
+  //
+  // * If we execute a command which prints sensitive output, then
+  //   stdoutFile/stderrFile must not be readable by other users.
+  // * paramsFile must not be readable by other users, or else they can read it
+  //   to figure out the path for stdoutFile/stderrFile and create these first
+  //   (locked down to their own access), which will crash exec() when it tries
+  //   to write to the files.
+  function writeFileLockedDown(filePath, data) {
+    fs.writeFileSync(filePath, data, {
+      encoding: 'utf8',
+      mode: parseInt('600', 8),
+    });
+  }
+  writeFileLockedDown(stdoutFile, '');
+  writeFileLockedDown(stderrFile, '');
+  writeFileLockedDown(paramsFile, JSON.stringify(paramsToSerialize));
+
+  var execArgs = [
+    EXEC_CHILD_PATH,
+    paramsFile,
+  ];
+
+  /* istanbul ignore else */
+  if (opts.silent) {
+    opts.stdio = 'ignore';
   } else {
-    cmd += ' > ' + stdoutFile + ' 2> ' + stderrFile; // works on both win/unix
-
-    script = [
-      "var child = require('child_process')",
-      "  , fs = require('fs');",
-      'var childProcess = child.exec(' + JSON.stringify(cmd) + ', ' + optString + ', function(err) {',
-      '  var fname = ' + JSON.stringify(codeFile) + ';',
-      '  if (!err) {',
-      '    fs.writeFileSync(fname, "0");',
-      '  } else if (err.code === undefined) {',
-      '    fs.writeFileSync(fname, "1");',
-      '  } else {',
-      '    fs.writeFileSync(fname, err.code.toString());',
-      '  }',
-      '});',
-    ].join('\n') +
-      (pipe ? '\nchildProcess.stdin.end(' + JSON.stringify(pipe) + ');\n' : '\n');
-
-    fs.writeFileSync(scriptFile, script);
-
-    child.exec(execCommand, opts);
-
-    // The wait loop
-    // sleepFile is used as a dummy I/O op to mitigate unnecessary CPU usage
-    // (tried many I/O sync ops, writeFileSync() seems to be only one that is effective in reducing
-    // CPU usage, though apparently not so much on Windows)
-    while (!fs.existsSync(codeFile)) { updateStream(stdoutFile); fs.writeFileSync(sleepFile, 'a'); }
-    while (!fs.existsSync(stdoutFile)) { updateStream(stdoutFile); fs.writeFileSync(sleepFile, 'a'); }
-    while (!fs.existsSync(stderrFile)) { updateStream(stderrFile); fs.writeFileSync(sleepFile, 'a'); }
-    try { common.unlinkSync(sleepFile); } catch (e) {}
+    opts.stdio = [0, 1, 2];
   }
 
-  // At this point codeFile exists, but it's not necessarily flushed yet.
-  // Keep reading it until it is.
-  var code = parseInt('', 10);
-  while (isNaN(code)) {
-    code = parseInt(fs.readFileSync(codeFile, 'utf8'), 10);
+  var code = 0;
+
+  // Welcome to the future
+  try {
+    // Bad things if we pass in a `shell` option to child_process.execFileSync,
+    // so we need to explicitly remove it here.
+    delete opts.shell;
+
+    child.execFileSync(common.config.execPath, execArgs, opts);
+  } catch (e) {
+    // Commands with non-zero exit code raise an exception.
+    code = e.status || DEFAULT_ERROR_CODE;
   }
 
-  var stdout = fs.readFileSync(stdoutFile, 'utf8');
-  var stderr = fs.readFileSync(stderrFile, 'utf8');
+  // fs.readFileSync uses buffer encoding by default, so call
+  // it without the encoding option if the encoding is 'buffer'.
+  // Also, if the exec timeout is too short for node to start up,
+  // the files will not be created, so these calls will throw.
+  var stdout = '';
+  var stderr = '';
+  if (opts.encoding === 'buffer') {
+    stdout = fs.readFileSync(stdoutFile);
+    stderr = fs.readFileSync(stderrFile);
+  } else {
+    stdout = fs.readFileSync(stdoutFile, opts.encoding);
+    stderr = fs.readFileSync(stderrFile, opts.encoding);
+  }
 
   // No biggie if we can't erase the files now -- they're in a temp dir anyway
-  try { common.unlinkSync(scriptFile); } catch (e) {}
-  try { common.unlinkSync(stdoutFile); } catch (e) {}
+  // and we locked down permissions (see the note above).
+  try { common.unlinkSync(paramsFile); } catch (e) {}
   try { common.unlinkSync(stderrFile); } catch (e) {}
-  try { common.unlinkSync(codeFile); } catch (e) {}
+  try { common.unlinkSync(stdoutFile); } catch (e) {}
 
   if (code !== 0) {
-    common.error('', code, { continue: true });
+    // Note: `silent` should be unconditionally true to avoid double-printing
+    // the command's stderr, and to avoid printing any stderr when the user has
+    // set `shell.config.silent`.
+    common.error(stderr, code, { continue: true, silent: true, fatal: opts.fatal });
   }
   var obj = common.ShellString(stdout, stderr, code);
   return obj;
@@ -183,22 +141,22 @@ function execSync(cmd, opts, pipe) {
 
 // Wrapper around exec() to enable echoing output to console in real time
 function execAsync(cmd, opts, pipe, callback) {
-  var stdout = '';
-  var stderr = '';
-
   opts = common.extend({
     silent: common.config.silent,
+    fatal: common.config.fatal, // TODO(nfischer): this and the line above are probably unnecessary
     cwd: _pwd().toString(),
     env: process.env,
-    maxBuffer: DEFAULT_MAXBUFFER_SIZE
+    maxBuffer: DEFAULT_MAXBUFFER_SIZE,
+    encoding: 'utf8',
   }, opts);
 
-  var c = child.exec(cmd, opts, function (err) {
+  var c = child.exec(cmd, opts, function (err, stdout, stderr) {
     if (callback) {
       if (!err) {
         callback(0, stdout, stderr);
       } else if (err.code === undefined) {
         // See issue #536
+        /* istanbul ignore next */
         callback(1, stdout, stderr);
       } else {
         callback(err.code, stdout, stderr);
@@ -208,28 +166,27 @@ function execAsync(cmd, opts, pipe, callback) {
 
   if (pipe) c.stdin.end(pipe);
 
-  c.stdout.on('data', function (data) {
-    stdout += data;
-    if (!opts.silent) process.stdout.write(data);
-  });
-
-  c.stderr.on('data', function (data) {
-    stderr += data;
-    if (!opts.silent) process.stderr.write(data);
-  });
+  if (!opts.silent) {
+    c.stdout.pipe(process.stdout);
+    c.stderr.pipe(process.stderr);
+  }
 
   return c;
 }
 
 //@
 //@ ### exec(command [, options] [, callback])
-//@ Available options (all `false` by default):
+//@
+//@ Available options:
 //@
 //@ + `async`: Asynchronous execution. If a callback is provided, it will be set to
-//@   `true`, regardless of the passed value.
-//@ + `silent`: Do not echo program output to console.
-//@ + and any option available to NodeJS's
-//@   [child_process.exec()](https://nodejs.org/api/child_process.html#child_process_child_process_exec_command_options_callback)
+//@   `true`, regardless of the passed value (default: `false`).
+//@ + `fatal`: Exit upon error (default: `false`).
+//@ + `silent`: Do not echo program output to console (default: `false`).
+//@ + `encoding`: Character encoding to use. Affects the values returned to stdout and stderr, and
+//@   what is written to stdout and stderr when not in silent mode (default: `'utf8'`).
+//@ + and any option available to Node.js's
+//@   [`child_process.exec()`](https://nodejs.org/api/child_process.html#child_process_child_process_exec_command_options_callback)
 //@
 //@ Examples:
 //@
@@ -248,21 +205,21 @@ function execAsync(cmd, opts, pipe, callback) {
 //@ });
 //@ ```
 //@
-//@ Executes the given `command` _synchronously_, unless otherwise specified.  When in synchronous
-//@ mode, this returns a ShellString (compatible with ShellJS v0.6.x, which returns an object
-//@ of the form `{ code:..., stdout:... , stderr:... }`). Otherwise, this returns the child process
-//@ object, and the `callback` gets the arguments `(code, stdout, stderr)`.
+//@ Executes the given `command` _synchronously_, unless otherwise specified.
+//@ When in synchronous mode, this returns a [ShellString](#shellstringstr).
+//@ Otherwise, this returns the child process object, and the `callback`
+//@ receives the arguments `(code, stdout, stderr)`.
 //@
 //@ Not seeing the behavior you want? `exec()` runs everything through `sh`
 //@ by default (or `cmd.exe` on Windows), which differs from `bash`. If you
 //@ need bash-specific behavior, try out the `{shell: 'path/to/bash'}` option.
 //@
-//@ **Note:** For long-lived processes, it's best to run `exec()` asynchronously as
-//@ the current synchronous implementation uses a lot of CPU. This should be getting
-//@ fixed soon.
+//@ **Security note:** as `shell.exec()` executes an arbitrary string in the
+//@ system shell, it is **critical** to properly sanitize user input to avoid
+//@ **command injection**. For more context, consult the [Security
+//@ Guidelines](https://github.com/shelljs/shelljs/wiki/Security-guidelines).
 function _exec(command, options, callback) {
   options = options || {};
-  if (!command) common.error('must specify command');
 
   var pipe = common.readFromPipe();
 
@@ -279,17 +236,26 @@ function _exec(command, options, callback) {
 
   options = common.extend({
     silent: common.config.silent,
-    async: false
+    fatal: common.config.fatal,
+    async: false,
   }, options);
 
-  try {
-    if (options.async) {
-      return execAsync(command, options, pipe, callback);
-    } else {
-      return execSync(command, options, pipe);
+  if (!command) {
+    try {
+      common.error('must specify command');
+    } catch (e) {
+      if (options.fatal) {
+        throw e;
+      }
+
+      return;
     }
-  } catch (e) {
-    common.error('internal error');
+  }
+
+  if (options.async) {
+    return execAsync(command, options, pipe, callback);
+  } else {
+    return execSync(command, options, pipe);
   }
 }
 module.exports = _exec;
diff --git a/src/find.js b/src/find.js
index f96a51e78..80db9935b 100644
--- a/src/find.js
+++ b/src/find.js
@@ -1,13 +1,17 @@
-var fs = require('fs');
 var path = require('path');
 var common = require('./common');
 var _ls = require('./ls');
 
-common.register('find', _find, {});
+common.register('find', _find, {
+  cmdOptions: {
+    'L': 'link',
+  },
+});
 
 //@
 //@ ### find(path [, path ...])
 //@ ### find(path_array)
+//@
 //@ Examples:
 //@
 //@ ```javascript
@@ -16,10 +20,11 @@ common.register('find', _find, {});
 //@ find('.').filter(function(file) { return file.match(/\.js$/); });
 //@ ```
 //@
-//@ Returns array of all files (however deep) in the given paths.
+//@ Returns a [ShellString](#shellstringstr) (with array-like properties) of all
+//@ files (however deep) in the given paths.
 //@
 //@ The main difference from `ls('-R', path)` is that the resulting file names
-//@ include the base directories, e.g. `lib/resources/file1` instead of just `file1`.
+//@ include the base directories (e.g., `lib/resources/file1` instead of just `file1`).
 function _find(options, paths) {
   if (!paths) {
     common.error('no path specified');
@@ -30,20 +35,27 @@ function _find(options, paths) {
   var list = [];
 
   function pushFile(file) {
-    if (common.platform === 'win') {
+    if (process.platform === 'win32') {
       file = file.replace(/\\/g, '/');
     }
     list.push(file);
   }
 
-  // why not simply do ls('-R', paths)? because the output wouldn't give the base dirs
-  // to get the base dir in the output, we need instead ls('-R', 'dir/*') for every directory
+  // why not simply do `ls('-R', paths)`? because the output wouldn't give the base dirs
+  // to get the base dir in the output, we need instead `ls('-R', 'dir/*')` for every directory
 
   paths.forEach(function (file) {
+    var stat;
+    try {
+      stat = common.statFollowLinks(file);
+    } catch (e) {
+      common.error('no such file or directory: ' + file);
+    }
+
     pushFile(file);
 
-    if (fs.statSync(file).isDirectory()) {
-      _ls({ recursive: true, all: true }, file).forEach(function (subfile) {
+    if (stat.isDirectory()) {
+      _ls({ recursive: true, all: true, link: options.link }, file).forEach(function (subfile) {
         pushFile(path.join(file, subfile));
       });
     }
diff --git a/src/grep.js b/src/grep.js
index 30842bcb8..cfc83e40e 100644
--- a/src/grep.js
+++ b/src/grep.js
@@ -1,5 +1,5 @@
-var common = require('./common');
 var fs = require('fs');
+var common = require('./common');
 
 common.register('grep', _grep, {
   globStart: 2, // don't glob-expand the regex
@@ -7,39 +7,91 @@ common.register('grep', _grep, {
   cmdOptions: {
     'v': 'inverse',
     'l': 'nameOnly',
+    'i': 'ignoreCase',
+    'n': 'lineNumber',
+    'B': 'beforeContext',
+    'A': 'afterContext',
+    'C': 'context',
   },
 });
 
 //@
 //@ ### grep([options,] regex_filter, file [, file ...])
 //@ ### grep([options,] regex_filter, file_array)
+//@
 //@ Available options:
 //@
-//@ + `-v`: Inverse the sense of the regex and print the lines not matching the criteria.
-//@ + `-l`: Print only filenames of matching files
+//@ + `-v`: Invert `regex_filter` (only print non-matching lines).
+//@ + `-l`: Print only filenames of matching files.
+//@ + `-i`: Ignore case.
+//@ + `-n`: Print line numbers.
+//@ + `-B <num>`: Show `<num>` lines before each result.
+//@ + `-A <num>`: Show `<num>` lines after each result.
+//@ + `-C <num>`: Show `<num>` lines before and after each result. -B and -A override this option.
 //@
 //@ Examples:
 //@
 //@ ```javascript
 //@ grep('-v', 'GLOBAL_VARIABLE', '*.js');
 //@ grep('GLOBAL_VARIABLE', '*.js');
+//@ grep('-B', 3, 'GLOBAL_VARIABLE', '*.js');
+//@ grep({ '-B': 3 }, 'GLOBAL_VARIABLE', '*.js');
+//@ grep({ '-B': 3, '-C': 2 }, 'GLOBAL_VARIABLE', '*.js');
 //@ ```
 //@
-//@ Reads input string from given files and returns a string containing all lines of the
-//@ file that match the given `regex_filter`.
+//@ Reads input string from given files and returns a
+//@ [ShellString](#shellstringstr) containing all lines of the @ file that match
+//@ the given `regex_filter`.
 function _grep(options, regex, files) {
   // Check if this is coming from a pipe
   var pipe = common.readFromPipe();
 
   if (!files && !pipe) common.error('no paths given', 2);
 
-  files = [].slice.call(arguments, 2);
+  var idx = 2;
+  var contextError = ': invalid context length argument';
+  // If the option has been found but not read, copy value from arguments
+  if (options.beforeContext === true) {
+    idx = 3;
+    options.beforeContext = Number(arguments[1]);
+    if (options.beforeContext < 0) {
+      common.error(options.beforeContext + contextError, 2);
+    }
+  }
+  if (options.afterContext === true) {
+    idx = 3;
+    options.afterContext = Number(arguments[1]);
+    if (options.afterContext < 0) {
+      common.error(options.afterContext + contextError, 2);
+    }
+  }
+  if (options.context === true) {
+    idx = 3;
+    options.context = Number(arguments[1]);
+    if (options.context < 0) {
+      common.error(options.context + contextError, 2);
+    }
+  }
+  //  If before or after not given but context is, update values
+  if (typeof options.context === 'number') {
+    if (options.beforeContext === false) {
+      options.beforeContext = options.context;
+    }
+    if (options.afterContext === false) {
+      options.afterContext = options.context;
+    }
+  }
+  regex = arguments[idx - 1];
+  files = [].slice.call(arguments, idx);
 
   if (pipe) {
     files.unshift('-');
   }
 
   var grep = [];
+  if (options.ignoreCase) {
+    regex = new RegExp(regex, 'i');
+  }
   files.forEach(function (file) {
     if (!fs.existsSync(file) && file !== '-') {
       common.error('no such file or directory: ' + file, 2, { continue: true });
@@ -47,21 +99,100 @@ function _grep(options, regex, files) {
     }
 
     var contents = file === '-' ? pipe : fs.readFileSync(file, 'utf8');
-    var lines = contents.split(/\r*\n/);
     if (options.nameOnly) {
       if (contents.match(regex)) {
         grep.push(file);
       }
     } else {
-      lines.forEach(function (line) {
+      var lines = contents.split('\n');
+      var matches = [];
+
+      lines.forEach(function (line, index) {
         var matched = line.match(regex);
         if ((options.inverse && !matched) || (!options.inverse && matched)) {
-          grep.push(line);
+          var lineNumber = index + 1;
+          var result = {};
+          if (matches.length > 0) {
+            // If the last result intersects, combine them
+            var last = matches[matches.length - 1];
+            var minimumLineNumber = Math.max(
+              1,
+              lineNumber - options.beforeContext - 1,
+            );
+            if (
+              last.hasOwnProperty('' + lineNumber) ||
+              last.hasOwnProperty('' + minimumLineNumber)
+            ) {
+              result = last;
+            }
+          }
+          result[lineNumber] = {
+            line,
+            match: true,
+          };
+          if (options.beforeContext > 0) {
+            // Store the lines with their line numbers to check for overlap
+            lines
+              .slice(Math.max(index - options.beforeContext, 0), index)
+              .forEach(function (v, i, a) {
+                var lineNum = '' + (index - a.length + i + 1);
+                if (!result.hasOwnProperty(lineNum)) {
+                  result[lineNum] = { line: v, match: false };
+                }
+              });
+          }
+          if (options.afterContext > 0) {
+            // Store the lines with their line numbers to check for overlap
+            lines
+              .slice(
+                index + 1,
+                Math.min(index + options.afterContext + 1, lines.length - 1),
+              )
+              .forEach(function (v, i) {
+                var lineNum = '' + (index + 1 + i + 1);
+                if (!result.hasOwnProperty(lineNum)) {
+                  result[lineNum] = { line: v, match: false };
+                }
+              });
+          }
+          // Only add the result if it's new
+          if (!matches.includes(result)) {
+            matches.push(result);
+          }
         }
       });
+
+      // Loop through the matches and add them to the output
+      Array.prototype.push.apply(
+        grep,
+        matches.map(function (result) {
+          return Object.entries(result)
+            .map(function (entry) {
+              var lineNumber = entry[0];
+              var line = entry[1].line;
+              var match = entry[1].match;
+              return options.lineNumber
+                ? lineNumber + (match ? ':' : '-') + line
+                : line;
+            })
+            .join('\n');
+        }),
+      );
     }
   });
 
-  return grep.join('\n') + '\n';
+  if (grep.length === 0 && common.state.errorCode !== 2) {
+    // We didn't hit the error above, but pattern didn't match
+    common.error('', { silent: true });
+  }
+
+  var separator = '\n';
+  if (
+    typeof options.beforeContext === 'number' ||
+    typeof options.afterContext === 'number'
+  ) {
+    separator = '\n--\n';
+  }
+  return grep.join(separator) + '\n';
 }
 module.exports = _grep;
diff --git a/src/head.js b/src/head.js
index 13d582977..f3f4f2269 100644
--- a/src/head.js
+++ b/src/head.js
@@ -1,5 +1,5 @@
-var common = require('./common');
 var fs = require('fs');
+var common = require('./common');
 
 common.register('head', _head, {
   canReceivePipe: true,
@@ -8,24 +8,18 @@ common.register('head', _head, {
   },
 });
 
-// This reads n or more lines, or the entire file, whichever is less.
+// Reads |numLines| lines or the entire file, whichever is less.
 function readSomeLines(file, numLines) {
-  var BUF_LENGTH = 64 * 1024;
-  var buf = new Buffer(BUF_LENGTH);
-  var bytesRead = BUF_LENGTH;
+  var buf = common.buffer();
+  var bufLength = buf.length;
+  var bytesRead = bufLength;
   var pos = 0;
-  var fdr = null;
-
-  try {
-    fdr = fs.openSync(file, 'r');
-  } catch (e) {
-    common.error('cannot read file: ' + file);
-  }
 
+  var fdr = fs.openSync(file, 'r');
   var numLinesRead = 0;
   var ret = '';
-  while (bytesRead === BUF_LENGTH && numLinesRead < numLines) {
-    bytesRead = fs.readSync(fdr, buf, 0, BUF_LENGTH, pos);
+  while (bytesRead === bufLength && numLinesRead < numLines) {
+    bytesRead = fs.readSync(fdr, buf, 0, bufLength, pos);
     var bufStr = buf.toString('utf8', 0, bytesRead);
     numLinesRead += bufStr.split('\n').length - 1;
     ret += bufStr;
@@ -35,9 +29,11 @@ function readSomeLines(file, numLines) {
   fs.closeSync(fdr);
   return ret;
 }
+
 //@
 //@ ### head([{'-n': \<num\>},] file [, file ...])
 //@ ### head([{'-n': \<num\>},] file_array)
+//@
 //@ Available options:
 //@
 //@ + `-n <num>`: Show the first `<num>` lines of the files
@@ -50,7 +46,7 @@ function readSomeLines(file, numLines) {
 //@ var str = head(['file1', 'file2']); // same as above
 //@ ```
 //@
-//@ Read the start of a file.
+//@ Read the start of a `file`. Returns a [ShellString](#shellstringstr).
 function _head(options, files) {
   var head = [];
   var pipe = common.readFromPipe();
@@ -72,9 +68,16 @@ function _head(options, files) {
 
   var shouldAppendNewline = false;
   files.forEach(function (file) {
-    if (!fs.existsSync(file) && file !== '-') {
-      common.error('no such file or directory: ' + file, { continue: true });
-      return;
+    if (file !== '-') {
+      if (!fs.existsSync(file)) {
+        common.error('no such file or directory: ' + file, { continue: true });
+        return;
+      } else if (common.statFollowLinks(file).isDirectory()) {
+        common.error("error reading '" + file + "': Is a directory", {
+          continue: true,
+        });
+        return;
+      }
     }
 
     var contents;
diff --git a/src/ln.js b/src/ln.js
index 7393d9fcd..1d3d0e745 100644
--- a/src/ln.js
+++ b/src/ln.js
@@ -11,6 +11,7 @@ common.register('ln', _ln, {
 
 //@
 //@ ### ln([options,] source, dest)
+//@
 //@ Available options:
 //@
 //@ + `-s`: symlink
@@ -23,7 +24,9 @@ common.register('ln', _ln, {
 //@ ln('-sf', 'file', 'existing');
 //@ ```
 //@
-//@ Links source to dest. Use -f to force the link, should dest already exist.
+//@ Links `source` to `dest`. Use `-f` to force the link, should `dest` already
+//@ exist. Returns a [ShellString](#shellstringstr) indicating success or
+//@ failure.
 function _ln(options, source, dest) {
   if (!source || !dest) {
     common.error('Missing <source> and/or <dest>');
@@ -43,12 +46,12 @@ function _ln(options, source, dest) {
   }
 
   if (options.symlink) {
-    var isWindows = common.platform === 'win';
+    var isWindows = process.platform === 'win32';
     var linkType = isWindows ? 'file' : null;
     var resolvedSourcePath = isAbsolute ? sourcePath : path.resolve(process.cwd(), path.dirname(dest), source);
     if (!fs.existsSync(resolvedSourcePath)) {
       common.error('Source file does not exist', { continue: true });
-    } else if (isWindows && fs.statSync(resolvedSourcePath).isDirectory()) {
+    } else if (isWindows && common.statFollowLinks(resolvedSourcePath).isDirectory()) {
       linkType = 'junction';
     }
 
diff --git a/src/ls.js b/src/ls.js
index 7f25056cd..7f32c6e09 100644
--- a/src/ls.js
+++ b/src/ls.js
@@ -1,14 +1,16 @@
 var path = require('path');
 var fs = require('fs');
+var glob = require('fast-glob');
 var common = require('./common');
-var glob = require('glob');
 
-var globPatternRecursive = path.sep + '**' + path.sep + '*';
+// glob patterns use the UNIX path seperator
+var globPatternRecursive = '/**';
 
 common.register('ls', _ls, {
   cmdOptions: {
     'R': 'recursive',
     'A': 'all',
+    'L': 'link',
     'a': 'all_deprecated',
     'd': 'directory',
     'l': 'long',
@@ -18,26 +20,35 @@ common.register('ls', _ls, {
 //@
 //@ ### ls([options,] [path, ...])
 //@ ### ls([options,] path_array)
+//@
 //@ Available options:
 //@
 //@ + `-R`: recursive
 //@ + `-A`: all files (include files beginning with `.`, except for `.` and `..`)
+//@ + `-L`: follow symlinks
 //@ + `-d`: list directories themselves, not their contents
-//@ + `-l`: list objects representing each file, each with fields containing `ls
-//@         -l` output fields. See
-//@         [fs.Stats](https://nodejs.org/api/fs.html#fs_class_fs_stats)
-//@         for more info
+//@ + `-l`: provides more details for each file. Specifically, each file is
+//@         represented by a structured object with separate fields for file
+//@         metadata (see
+//@         [`fs.Stats`](https://nodejs.org/api/fs.html#fs_class_fs_stats)). The
+//@         return value also overrides `.toString()` to resemble `ls -l`'s
+//@         output format for human readability, but programmatic usage should
+//@         depend on the stable object format rather than the `.toString()`
+//@         representation.
 //@
 //@ Examples:
 //@
 //@ ```javascript
 //@ ls('projs/*.js');
+//@ ls('projs/**/*.js'); // Find all js files recursively in projs
 //@ ls('-R', '/users/me', '/tmp');
 //@ ls('-R', ['/users/me', '/tmp']); // same as above
 //@ ls('-l', 'file.txt'); // { name: 'file.txt', mode: 33188, nlink: 1, ...}
 //@ ```
 //@
-//@ Returns array of files in the given path, or in current directory if no path provided.
+//@ Returns a [ShellString](#shellstringstr) (with array-like properties) of all
+//@ the files in the given `path`, or files in the current directory if no
+//@ `path` is  provided.
 function _ls(options, paths) {
   if (options.all_deprecated) {
     // We won't support the -a option as it's hard to image why it's useful
@@ -60,7 +71,7 @@ function _ls(options, paths) {
       relName = relName.replace(/\\/g, '/');
     }
     if (options.long) {
-      stat = stat || fs.lstatSync(abs);
+      stat = stat || (options.link ? common.statFollowLinks(abs) : common.statNoFollowLinks(abs));
       list.push(addLsAttributes(relName, stat));
     } else {
       // list.push(path.relative(rel || '.', file));
@@ -72,7 +83,20 @@ function _ls(options, paths) {
     var stat;
 
     try {
-      stat = fs.lstatSync(p);
+      stat = options.link ? common.statFollowLinks(p) : common.statNoFollowLinks(p);
+      // follow links to directories by default
+      if (stat.isSymbolicLink()) {
+        /* istanbul ignore next */
+        // workaround for https://github.com/shelljs/shelljs/issues/795
+        // codecov seems to have a bug that miscalculate this block as uncovered.
+        // but according to nyc report this block does get covered.
+        try {
+          var _stat = common.statFollowLinks(p);
+          if (_stat.isDirectory()) {
+            stat = _stat;
+          }
+        } catch (_) {} // bad symlink, treat it like a file
+      }
     } catch (e) {
       common.error('no such file or directory: ' + p, 2, { continue: true });
       return;
@@ -82,10 +106,20 @@ function _ls(options, paths) {
     if (stat.isDirectory() && !options.directory) {
       if (options.recursive) {
         // use glob, because it's simple
-        glob.sync(p + globPatternRecursive, { dot: options.all })
-          .forEach(function (item) {
+        glob.sync(p + globPatternRecursive, {
+          // These options are just to make fast-glob be compatible with POSIX
+          // (bash) wildcard behavior.
+          onlyFiles: false,
+
+          // These options depend on the cmdOptions provided to ls.
+          dot: options.all,
+          followSymbolicLinks: options.link,
+        }).forEach(function (item) {
+          // Glob pattern returns the directory itself and needs to be filtered out.
+          if (path.relative(p, item)) {
             pushFile(item, path.relative(p, item));
-          });
+          }
+        });
       } else if (options.all) {
         // use fs.readdirSync, because it's fast
         fs.readdirSync(p).forEach(function (item) {
diff --git a/src/mkdir.js b/src/mkdir.js
index 0b8c6fe53..021cad9c0 100644
--- a/src/mkdir.js
+++ b/src/mkdir.js
@@ -1,6 +1,6 @@
-var common = require('./common');
 var fs = require('fs');
 var path = require('path');
+var common = require('./common');
 
 common.register('mkdir', _mkdir, {
   cmdOptions: {
@@ -8,7 +8,7 @@ common.register('mkdir', _mkdir, {
   },
 });
 
-// Recursively creates 'dir'
+// Recursively creates `dir`
 function mkdirSyncRecursive(dir) {
   var baseDir = path.dirname(dir);
 
@@ -19,25 +19,27 @@ function mkdirSyncRecursive(dir) {
     common.error('dirname() failed: [' + dir + ']');
   }
 
-  // Base dir exists, no recursion necessary
-  if (fs.existsSync(baseDir)) {
-    fs.mkdirSync(dir, parseInt('0777', 8));
-    return;
-  }
-
   // Base dir does not exist, go recursive
-  mkdirSyncRecursive(baseDir);
+  if (!fs.existsSync(baseDir)) {
+    mkdirSyncRecursive(baseDir);
+  }
 
-  // Base dir created, can create dir
-  fs.mkdirSync(dir, parseInt('0777', 8));
+  try {
+    // Base dir created, can create dir
+    fs.mkdirSync(dir, parseInt('0777', 8));
+  } catch (e) {
+    // swallow error if dir already exists
+    if (e.code !== 'EEXIST' || common.statNoFollowLinks(dir).isFile()) { throw e; }
+  }
 }
 
 //@
 //@ ### mkdir([options,] dir [, dir ...])
 //@ ### mkdir([options,] dir_array)
+//@
 //@ Available options:
 //@
-//@ + `-p`: full path (will create intermediate dirs if necessary)
+//@ + `-p`: full path (and create intermediate directories, if necessary)
 //@
 //@ Examples:
 //@
@@ -46,7 +48,8 @@ function mkdirSyncRecursive(dir) {
 //@ mkdir('-p', ['/tmp/a/b/c/d', '/tmp/e/f/g']); // same as above
 //@ ```
 //@
-//@ Creates directories.
+//@ Creates directories. Returns a [ShellString](#shellstringstr) indicating
+//@ success or failure.
 function _mkdir(options, dirs) {
   if (!dirs) common.error('no paths given');
 
@@ -57,9 +60,11 @@ function _mkdir(options, dirs) {
 
   dirs.forEach(function (dir) {
     try {
-      fs.lstatSync(dir);
+      var stat = common.statNoFollowLinks(dir);
       if (!options.fullpath) {
         common.error('path already exists: ' + dir, { continue: true });
+      } else if (stat.isFile()) {
+        common.error('cannot create directory ' + dir + ': File exists', { continue: true });
       }
       return; // skip dir
     } catch (e) {
@@ -80,13 +85,18 @@ function _mkdir(options, dirs) {
         fs.mkdirSync(dir, parseInt('0777', 8));
       }
     } catch (e) {
+      var reason;
       if (e.code === 'EACCES') {
-        common.error('cannot create directory ' + dir + ': Permission denied');
+        reason = 'Permission denied';
+      } else if (e.code === 'ENOTDIR' || e.code === 'ENOENT') {
+        reason = 'Not a directory';
       } else {
+        /* istanbul ignore next */
         throw e;
       }
+      common.error('cannot create directory ' + dir + ': ' + reason, { continue: true });
     }
   });
   return '';
-} // mkdir
+} // man arraykdir
 module.exports = _mkdir;
diff --git a/src/mv.js b/src/mv.js
index c09bbbc76..6e89e2fae 100644
--- a/src/mv.js
+++ b/src/mv.js
@@ -11,9 +11,18 @@ common.register('mv', _mv, {
   },
 });
 
+// Checks if cureent file was created recently
+function checkRecentCreated(sources, index) {
+  var lookedSource = sources[index];
+  return sources.slice(0, index).some(function (src) {
+    return path.basename(src) === path.basename(lookedSource);
+  });
+}
+
 //@
 //@ ### mv([options ,] source [, source ...], dest')
 //@ ### mv([options ,] source_array, dest')
+//@
 //@ Available options:
 //@
 //@ + `-f`: force (default behavior)
@@ -27,7 +36,8 @@ common.register('mv', _mv, {
 //@ mv(['file1', 'file2'], 'dir/'); // same as above
 //@ ```
 //@
-//@ Moves files.
+//@ Moves `source` file(s) to `dest`. Returns a [ShellString](#shellstringstr)
+//@ indicating success or failure.
 function _mv(options, sources, dest) {
   // Get sources, dest
   if (arguments.length < 3) {
@@ -38,11 +48,12 @@ function _mv(options, sources, dest) {
   } else if (typeof sources === 'string') {
     sources = [sources];
   } else {
+    // TODO(nate): figure out if we actually need this line
     common.error('invalid arguments');
   }
 
   var exists = fs.existsSync(dest);
-  var stats = exists && fs.statSync(dest);
+  var stats = exists && common.statFollowLinks(dest);
 
   // Dest is not existing dir, but multiple sources given
   if ((!exists || !stats.isDirectory()) && sources.length > 1) {
@@ -54,7 +65,7 @@ function _mv(options, sources, dest) {
     common.error('dest file already exists: ' + dest);
   }
 
-  sources.forEach(function (src) {
+  sources.forEach(function (src, srcIndex) {
     if (!fs.existsSync(src)) {
       common.error('no such file or directory: ' + src, { continue: true });
       return; // skip file
@@ -65,10 +76,20 @@ function _mv(options, sources, dest) {
     // When copying to '/path/dir':
     //    thisDest = '/path/dir/file1'
     var thisDest = dest;
-    if (fs.existsSync(dest) && fs.statSync(dest).isDirectory()) {
+    if (fs.existsSync(dest) && common.statFollowLinks(dest).isDirectory()) {
       thisDest = path.normalize(dest + '/' + path.basename(src));
     }
 
+    var thisDestExists = fs.existsSync(thisDest);
+
+    if (thisDestExists && checkRecentCreated(sources, srcIndex)) {
+      // cannot overwrite file created recently in current execution, but we want to continue copying other files
+      if (!options.no_force) {
+        common.error("will not overwrite just-created '" + thisDest + "' with '" + src + "'", { continue: true });
+      }
+      return;
+    }
+
     if (fs.existsSync(thisDest) && options.no_force) {
       common.error('dest file already exists: ' + thisDest, { continue: true });
       return; // skip file
@@ -82,11 +103,14 @@ function _mv(options, sources, dest) {
     try {
       fs.renameSync(src, thisDest);
     } catch (e) {
-      if (e.code === 'EXDEV') { // external partition
-        // if either of these fails, the appropriate error message will bubble
-        // up to the top level automatically
-        cp('-r', src, thisDest);
-        rm('-rf', src);
+      /* istanbul ignore next */
+      if (e.code === 'EXDEV') {
+        // If we're trying to `mv` to an external partition, we'll actually need
+        // to perform a copy and then clean up the original file. If either the
+        // copy or the rm fails with an exception, we should allow this
+        // exception to pass up to the top level.
+        cp({ recursive: true }, src, thisDest);
+        rm({ recursive: true, force: true }, src);
       }
     }
   }); // forEach(src)
diff --git a/src/pwd.js b/src/pwd.js
index 38618518b..8527d8b38 100644
--- a/src/pwd.js
+++ b/src/pwd.js
@@ -7,7 +7,8 @@ common.register('pwd', _pwd, {
 
 //@
 //@ ### pwd()
-//@ Returns the current directory.
+//@
+//@ Returns the current directory as a [ShellString](#shellstringstr).
 function _pwd() {
   var pwd = path.resolve(process.cwd());
   return pwd;
diff --git a/src/rm.js b/src/rm.js
index 803adbc5e..6bb57558b 100644
--- a/src/rm.js
+++ b/src/rm.js
@@ -1,5 +1,5 @@
-var common = require('./common');
 var fs = require('fs');
+var common = require('./common');
 
 common.register('rm', _rm, {
   cmdOptions: {
@@ -17,7 +17,7 @@ common.register('rm', _rm, {
 //
 // Licensed under the MIT License
 // http://www.opensource.org/licenses/mit-license.php
-function rmdirSyncRecursive(dir, force) {
+function rmdirSyncRecursive(dir, force, fromSymlink) {
   var files;
 
   files = fs.readdirSync(dir);
@@ -25,21 +25,27 @@ function rmdirSyncRecursive(dir, force) {
   // Loop through and delete everything in the sub-tree after checking it
   for (var i = 0; i < files.length; i++) {
     var file = dir + '/' + files[i];
-    var currFile = fs.lstatSync(file);
+    var currFile = common.statNoFollowLinks(file);
 
     if (currFile.isDirectory()) { // Recursive function back to the beginning
       rmdirSyncRecursive(file, force);
-    } else { // Assume it's a file - perhaps a try/catch belongs here?
-      if (force || isWriteable(file)) {
-        try {
-          common.unlinkSync(file);
-        } catch (e) {
-          common.error('could not remove file (code ' + e.code + '): ' + file, { continue: true });
-        }
+    } else if (force || isWriteable(file)) {
+      // Assume it's a file - perhaps a try/catch belongs here?
+      try {
+        common.unlinkSync(file);
+      } catch (e) {
+        /* istanbul ignore next */
+        common.error('could not remove file (code ' + e.code + '): ' + file, {
+          continue: true,
+        });
       }
     }
   }
 
+  // if was directory was referenced through a symbolic link,
+  // the contents should be removed, but not the directory itself
+  if (fromSymlink) return;
+
   // Now that we know everything in the sub-tree has been deleted, we can delete the main directory.
   // Huzzah for the shopkeep.
 
@@ -55,6 +61,7 @@ function rmdirSyncRecursive(dir, force) {
         if (fs.existsSync(dir)) throw { code: 'EAGAIN' };
         break;
       } catch (er) {
+        /* istanbul ignore next */
         // In addition to error codes, also check if the directory still exists and loop again if true
         if (process.platform === 'win32' && (er.code === 'ENOTEMPTY' || er.code === 'EBUSY' || er.code === 'EPERM' || er.code === 'EAGAIN')) {
           if (Date.now() - start > 1000) throw er;
@@ -87,9 +94,61 @@ function isWriteable(file) {
   return writePermission;
 }
 
+function handleFile(file, options) {
+  if (options.force || isWriteable(file)) {
+    // -f was passed, or file is writable, so it can be removed
+    common.unlinkSync(file);
+  } else {
+    common.error('permission denied: ' + file, { continue: true });
+  }
+}
+
+function handleDirectory(file, options) {
+  if (options.recursive) {
+    // -r was passed, so directory can be removed
+    rmdirSyncRecursive(file, options.force);
+  } else {
+    common.error('path is a directory', { continue: true });
+  }
+}
+
+function handleSymbolicLink(file, options) {
+  var stats;
+  try {
+    stats = common.statFollowLinks(file);
+  } catch (e) {
+    // symlink is broken, so remove the symlink itself
+    common.unlinkSync(file);
+    return;
+  }
+
+  if (stats.isFile()) {
+    common.unlinkSync(file);
+  } else if (stats.isDirectory()) {
+    if (file[file.length - 1] === '/') {
+      // trailing separator, so remove the contents, not the link
+      if (options.recursive) {
+        // -r was passed, so directory can be removed
+        var fromSymlink = true;
+        rmdirSyncRecursive(file, options.force, fromSymlink);
+      } else {
+        common.error('path is a directory', { continue: true });
+      }
+    } else {
+      // no trailing separator, so remove the link
+      common.unlinkSync(file);
+    }
+  }
+}
+
+function handleFIFO(file) {
+  common.unlinkSync(file);
+}
+
 //@
 //@ ### rm([options,] file [, file ...])
 //@ ### rm([options,] file_array)
+//@
 //@ Available options:
 //@
 //@ + `-f`: force
@@ -103,7 +162,8 @@ function isWriteable(file) {
 //@ rm(['some_file.txt', 'another_file.txt']); // same as above
 //@ ```
 //@
-//@ Removes files.
+//@ Removes files. Returns a [ShellString](#shellstringstr) indicating success
+//@ or failure.
 function _rm(options, files) {
   if (!files) common.error('no paths given');
 
@@ -111,9 +171,12 @@ function _rm(options, files) {
   files = [].slice.call(arguments, 1);
 
   files.forEach(function (file) {
-    var stats;
+    var lstats;
     try {
-      stats = fs.lstatSync(file); // test for existence
+      var filepath = (file[file.length - 1] === '/')
+        ? file.slice(0, -1) // remove the '/' so lstatSync can detect symlinks
+        : file;
+      lstats = common.statNoFollowLinks(filepath); // test for existence
     } catch (e) {
       // Path does not exist, no force flag given
       if (!options.force) {
@@ -123,22 +186,14 @@ function _rm(options, files) {
     }
 
     // If here, path exists
-    if (stats.isFile()) {
-      if (options.force || isWriteable(file)) {
-        // -f was passed, or file is writable, so it can be removed
-        common.unlinkSync(file);
-      } else {
-        common.error('permission denied: ' + file, { continue: true });
-      }
-    } else if (stats.isDirectory()) {
-      if (options.recursive) {
-        // -r was passed, so directory can be removed
-        rmdirSyncRecursive(file, options.force);
-      } else {
-        common.error('path is a directory', { continue: true });
-      }
-    } else if (stats.isSymbolicLink()) {
-      common.unlinkSync(file);
+    if (lstats.isFile()) {
+      handleFile(file, options);
+    } else if (lstats.isDirectory()) {
+      handleDirectory(file, options);
+    } else if (lstats.isSymbolicLink()) {
+      handleSymbolicLink(file, options);
+    } else if (lstats.isFIFO()) {
+      handleFIFO(file);
     }
   }); // forEach(file)
   return '';
diff --git a/src/sed.js b/src/sed.js
index dfdc0a747..693652362 100644
--- a/src/sed.js
+++ b/src/sed.js
@@ -1,5 +1,5 @@
-var common = require('./common');
 var fs = require('fs');
+var common = require('./common');
 
 common.register('sed', _sed, {
   globStart: 3, // don't glob-expand regexes
@@ -12,19 +12,20 @@ common.register('sed', _sed, {
 //@
 //@ ### sed([options,] search_regex, replacement, file [, file ...])
 //@ ### sed([options,] search_regex, replacement, file_array)
+//@
 //@ Available options:
 //@
-//@ + `-i`: Replace contents of 'file' in-place. _Note that no backups will be created!_
+//@ + `-i`: Replace contents of `file` in-place. _Note that no backups will be created!_
 //@
 //@ Examples:
 //@
 //@ ```javascript
 //@ sed('-i', 'PROGRAM_VERSION', 'v0.1.3', 'source.js');
-//@ sed(/.*DELETE_THIS_LINE.*\n/, '', 'source.js');
 //@ ```
 //@
-//@ Reads an input string from `files` and performs a JavaScript `replace()` on the input
-//@ using the given search regex and replacement string or function. Returns the new string after replacement.
+//@ Reads an input string from `file`s, line by line, and performs a JavaScript `replace()` on
+//@ each of the lines from the input string using the given `search_regex` and `replacement` string or
+//@ function. Returns the new [ShellString](#shellstringstr) after replacement.
 //@
 //@ Note:
 //@
@@ -34,6 +35,10 @@ common.register('sed', _sed, {
 //@ ```javascript
 //@ sed(/(\w+)\s(\w+)/, '$2, $1', 'file.txt');
 //@ ```
+//@
+//@ Also, like unix `sed`, ShellJS `sed` runs replacements on each line from the input file
+//@ (split by '\n') separately, so `search_regex`es that span more than one line (or include '\n')
+//@ will not match anything and nothing will be replaced.
 function _sed(options, regex, replacement, files) {
   // Check if this is coming from a pipe
   var pipe = common.readFromPipe();
@@ -69,7 +74,7 @@ function _sed(options, regex, replacement, files) {
     }
 
     var contents = file === '-' ? pipe : fs.readFileSync(file, 'utf8');
-    var lines = contents.split(/\r*\n/);
+    var lines = contents.split('\n');
     var result = lines.map(function (line) {
       return line.replace(regex, replacement);
     }).join('\n');
@@ -81,6 +86,10 @@ function _sed(options, regex, replacement, files) {
     }
   });
 
-  return sed.join('\n');
+  if (options.inplace) {
+    return '';
+  } else {
+    return sed.join('\n');
+  }
 }
 module.exports = _sed;
diff --git a/src/set.js b/src/set.js
index 3402cd660..6f37bc9a9 100644
--- a/src/set.js
+++ b/src/set.js
@@ -7,6 +7,7 @@ common.register('set', _set, {
 
 //@
 //@ ### set(options)
+//@
 //@ Available options:
 //@
 //@ + `+/-e`: exit upon error (`config.fatal`)
@@ -20,7 +21,7 @@ common.register('set', _set, {
 //@ set('+e'); // this undoes a "set('-e')"
 //@ ```
 //@
-//@ Sets global configuration variables
+//@ Sets global configuration variables.
 function _set(options) {
   if (!options) {
     var args = [].slice.call(arguments, 0);
@@ -34,7 +35,7 @@ function _set(options) {
   options = common.parseOptions(options, {
     'e': 'fatal',
     'v': 'verbose',
-    'f': 'noglob'
+    'f': 'noglob',
   });
 
   if (negate) {
@@ -50,6 +51,5 @@ function _set(options) {
       common.config[key] = options[key];
     }
   });
-  return;
 }
 module.exports = _set;
diff --git a/src/sort.js b/src/sort.js
index 041b03772..66b042ce4 100644
--- a/src/sort.js
+++ b/src/sort.js
@@ -1,5 +1,5 @@
-var common = require('./common');
 var fs = require('fs');
+var common = require('./common');
 
 common.register('sort', _sort, {
   canReceivePipe: true,
@@ -41,9 +41,10 @@ function numericalCmp(a, b) {
 //@
 //@ ### sort([options,] file [, file ...])
 //@ ### sort([options,] file_array)
+//@
 //@ Available options:
 //@
-//@ + `-r`: Reverse the result of comparisons
+//@ + `-r`: Reverse the results
 //@ + `-n`: Compare according to numerical value
 //@
 //@ Examples:
@@ -53,8 +54,9 @@ function numericalCmp(a, b) {
 //@ sort('-r', 'foo.txt');
 //@ ```
 //@
-//@ Return the contents of the files, sorted line-by-line. Sorting multiple
-//@ files mixes their content, just like unix sort does.
+//@ Return the contents of the `file`s, sorted line-by-line as a
+//@ [ShellString](#shellstringstr). Sorting multiple files mixes their content
+//@ (just as unix `sort` does).
 function _sort(options, files) {
   // Check if this is coming from a pipe
   var pipe = common.readFromPipe();
@@ -67,19 +69,24 @@ function _sort(options, files) {
     files.unshift('-');
   }
 
-  var lines = [];
-  files.forEach(function (file) {
-    if (!fs.existsSync(file) && file !== '-') {
-      // exit upon any sort of error
-      common.error('no such file or directory: ' + file);
+  var lines = files.reduce(function (accum, file) {
+    if (file !== '-') {
+      if (!fs.existsSync(file)) {
+        common.error('no such file or directory: ' + file, { continue: true });
+        return accum;
+      } else if (common.statFollowLinks(file).isDirectory()) {
+        common.error('read failed: ' + file + ': Is a directory', {
+          continue: true,
+        });
+        return accum;
+      }
     }
 
     var contents = file === '-' ? pipe : fs.readFileSync(file, 'utf8');
-    lines = lines.concat(contents.trimRight().split(/\r*\n/));
-  });
+    return accum.concat(contents.trimRight().split('\n'));
+  }, []);
 
-  var sorted;
-  sorted = lines.sort(options.numerical ? numericalCmp : unixCmp);
+  var sorted = lines.sort(options.numerical ? numericalCmp : unixCmp);
 
   if (options.reverse) {
     sorted = sorted.reverse();
diff --git a/src/tail.js b/src/tail.js
index 7ece654b1..eee75c570 100644
--- a/src/tail.js
+++ b/src/tail.js
@@ -1,5 +1,5 @@
-var common = require('./common');
 var fs = require('fs');
+var common = require('./common');
 
 common.register('tail', _tail, {
   canReceivePipe: true,
@@ -11,9 +11,10 @@ common.register('tail', _tail, {
 //@
 //@ ### tail([{'-n': \<num\>},] file [, file ...])
 //@ ### tail([{'-n': \<num\>},] file_array)
+//@
 //@ Available options:
 //@
-//@ + `-n <num>`: Show the last `<num>` lines of the files
+//@ + `-n <num>`: Show the last `<num>` lines of `file`s
 //@
 //@ Examples:
 //@
@@ -23,7 +24,7 @@ common.register('tail', _tail, {
 //@ var str = tail(['file1', 'file2']); // same as above
 //@ ```
 //@
-//@ Read the end of a file.
+//@ Read the end of a `file`. Returns a [ShellString](#shellstringstr).
 function _tail(options, files) {
   var tail = [];
   var pipe = common.readFromPipe();
@@ -31,12 +32,20 @@ function _tail(options, files) {
   if (!files && !pipe) common.error('no paths given');
 
   var idx = 1;
+  var plusOption = false;
   if (options.numLines === true) {
     idx = 2;
+    if (arguments[1][0] === '+') {
+      plusOption = true;
+    }
     options.numLines = Number(arguments[1]);
   } else if (options.numLines === false) {
     options.numLines = 10;
   }
+  // arguments[0] is a json object
+  if (arguments[0].numLines[0] === '+') {
+    plusOption = true;
+  }
   options.numLines = -1 * Math.abs(options.numLines);
   files = [].slice.call(arguments, idx);
 
@@ -46,9 +55,16 @@ function _tail(options, files) {
 
   var shouldAppendNewline = false;
   files.forEach(function (file) {
-    if (!fs.existsSync(file) && file !== '-') {
-      common.error('no such file or directory: ' + file, { continue: true });
-      return;
+    if (file !== '-') {
+      if (!fs.existsSync(file)) {
+        common.error('no such file or directory: ' + file, { continue: true });
+        return;
+      } else if (common.statFollowLinks(file).isDirectory()) {
+        common.error("error reading '" + file + "': Is a directory", {
+          continue: true,
+        });
+        return;
+      }
     }
 
     var contents = file === '-' ? pipe : fs.readFileSync(file, 'utf8');
@@ -61,12 +77,14 @@ function _tail(options, files) {
       shouldAppendNewline = false;
     }
 
-    tail = tail.concat(lines.slice(options.numLines));
+    tail = tail.concat(plusOption ? lines.slice(-options.numLines - 1) : lines.slice(options.numLines));
   });
 
   if (shouldAppendNewline) {
     tail.push(''); // to add a trailing newline once we join
   }
+
   return tail.join('\n');
 }
+
 module.exports = _tail;
diff --git a/src/tempdir.js b/src/tempdir.js
index cfd56b379..b6f7796ee 100644
--- a/src/tempdir.js
+++ b/src/tempdir.js
@@ -1,6 +1,6 @@
-var common = require('./common');
 var os = require('os');
 var fs = require('fs');
+var common = require('./common');
 
 common.register('tempdir', _tempDir, {
   allowGlobbing: false,
@@ -11,7 +11,7 @@ common.register('tempdir', _tempDir, {
 function writeableDir(dir) {
   if (!dir || !fs.existsSync(dir)) return false;
 
-  if (!fs.statSync(dir).isDirectory()) return false;
+  if (!common.statFollowLinks(dir).isDirectory()) return false;
 
   var testFile = dir + '/' + common.randomFileName();
   try {
@@ -19,10 +19,13 @@ function writeableDir(dir) {
     common.unlinkSync(testFile);
     return dir;
   } catch (e) {
+    /* istanbul ignore next */
     return false;
   }
 }
 
+// Variable to cache the tempdir value for successive lookups.
+var cachedTempDir;
 
 //@
 //@ ### tempdir()
@@ -36,11 +39,9 @@ function writeableDir(dir) {
 //@ Searches and returns string containing a writeable, platform-dependent temporary directory.
 //@ Follows Python's [tempfile algorithm](http://docs.python.org/library/tempfile.html#tempfile.tempdir).
 function _tempDir() {
-  var state = common.state;
-  if (state.tempDir) return state.tempDir; // from cache
+  if (cachedTempDir) return cachedTempDir;
 
-  state.tempDir = writeableDir(os.tmpdir && os.tmpdir()) || // node 0.10+
-                  writeableDir(os.tmpDir && os.tmpDir()) || // node 0.8+
+  cachedTempDir = writeableDir(os.tmpdir()) ||
                   writeableDir(process.env.TMPDIR) ||
                   writeableDir(process.env.TEMP) ||
                   writeableDir(process.env.TMP) ||
@@ -54,6 +55,21 @@ function _tempDir() {
                   writeableDir('/usr/tmp') ||
                   writeableDir('.'); // last resort
 
-  return state.tempDir;
+  return cachedTempDir;
+}
+
+// Indicates if the tempdir value is currently cached. This is exposed for tests
+// only. The return value should only be tested for truthiness.
+function isCached() {
+  return cachedTempDir;
 }
-module.exports = _tempDir;
+
+// Clears the cached tempDir value, if one is cached. This is exposed for tests
+// only.
+function clearCache() {
+  cachedTempDir = undefined;
+}
+
+module.exports.tempDir = _tempDir;
+module.exports.isCached = isCached;
+module.exports.clearCache = clearCache;
diff --git a/src/test.js b/src/test.js
index 3fb38aec4..7e769083d 100644
--- a/src/test.js
+++ b/src/test.js
@@ -1,5 +1,5 @@
-var common = require('./common');
 var fs = require('fs');
+var common = require('./common');
 
 common.register('test', _test, {
   cmdOptions: {
@@ -19,6 +19,7 @@ common.register('test', _test, {
 
 //@
 //@ ### test(expression)
+//@
 //@ Available expression primaries:
 //@
 //@ + `'-b', 'path'`: true if path is a block device
@@ -34,10 +35,11 @@ common.register('test', _test, {
 //@
 //@ ```javascript
 //@ if (test('-d', path)) { /* do something with dir */ };
-//@ if (!test('-f', path)) continue; // skip if it's a regular file
+//@ if (!test('-f', path)) continue; // skip if it's not a regular file
 //@ ```
 //@
-//@ Evaluates expression using the available primaries and returns corresponding value.
+//@ Evaluates `expression` using the available primaries and returns
+//@ corresponding boolean value.
 function _test(options, path) {
   if (!path) common.error('no path given');
 
@@ -52,7 +54,7 @@ function _test(options, path) {
 
   if (options.link) {
     try {
-      return fs.lstatSync(path).isSymbolicLink();
+      return common.statNoFollowLinks(path).isSymbolicLink();
     } catch (e) {
       return false;
     }
@@ -62,7 +64,7 @@ function _test(options, path) {
 
   if (options.exists) return true;
 
-  var stats = fs.statSync(path);
+  var stats = common.statFollowLinks(path);
 
   if (options.block) return stats.isBlockDevice();
 
@@ -72,10 +74,13 @@ function _test(options, path) {
 
   if (options.file) return stats.isFile();
 
+  /* istanbul ignore next */
   if (options.pipe) return stats.isFIFO();
 
+  /* istanbul ignore next */
   if (options.socket) return stats.isSocket();
 
+  /* istanbul ignore next */
   return false; // fallback
 } // test
 module.exports = _test;
diff --git a/src/to.js b/src/to.js
index 99f194e68..e4b064f49 100644
--- a/src/to.js
+++ b/src/to.js
@@ -1,6 +1,6 @@
-var common = require('./common');
 var fs = require('fs');
 var path = require('path');
+var common = require('./common');
 
 common.register('to', _to, {
   pipeOnly: true,
@@ -17,8 +17,9 @@ common.register('to', _to, {
 //@ ```
 //@
 //@ Analogous to the redirection operator `>` in Unix, but works with
-//@ ShellStrings (such as those returned by `cat`, `grep`, etc). _Like Unix
-//@ redirections, `to()` will overwrite any existing file!_
+//@ `ShellStrings` (such as those returned by `cat`, `grep`, etc.). _Like Unix
+//@ redirections, `to()` will overwrite any existing file!_ Returns the same
+//@ [ShellString](#shellstringstr) this operated on, to support chaining.
 function _to(options, file) {
   if (!file) common.error('wrong arguments');
 
@@ -30,6 +31,7 @@ function _to(options, file) {
     fs.writeFileSync(file, this.stdout || this.toString(), 'utf8');
     return this;
   } catch (e) {
+    /* istanbul ignore next */
     common.error('could not write to file (code ' + e.code + '): ' + file, { continue: true });
   }
 }
diff --git a/src/toEnd.js b/src/toEnd.js
index cf91c9401..dc30e6264 100644
--- a/src/toEnd.js
+++ b/src/toEnd.js
@@ -1,6 +1,6 @@
-var common = require('./common');
 var fs = require('fs');
 var path = require('path');
+var common = require('./common');
 
 common.register('toEnd', _toEnd, {
   pipeOnly: true,
@@ -17,7 +17,8 @@ common.register('toEnd', _toEnd, {
 //@ ```
 //@
 //@ Analogous to the redirect-and-append operator `>>` in Unix, but works with
-//@ ShellStrings (such as those returned by `cat`, `grep`, etc).
+//@ `ShellStrings` (such as those returned by `cat`, `grep`, etc.). Returns the
+//@ same [ShellString](#shellstringstr) this operated on, to support chaining.
 function _toEnd(options, file) {
   if (!file) common.error('wrong arguments');
 
@@ -29,6 +30,7 @@ function _toEnd(options, file) {
     fs.appendFileSync(file, this.stdout || this.toString(), 'utf8');
     return this;
   } catch (e) {
+    /* istanbul ignore next */
     common.error('could not append to file (code ' + e.code + '): ' + file, { continue: true });
   }
 }
diff --git a/src/touch.js b/src/touch.js
index b672b2d25..a26858648 100644
--- a/src/touch.js
+++ b/src/touch.js
@@ -1,5 +1,5 @@
-var common = require('./common');
 var fs = require('fs');
+var common = require('./common');
 
 common.register('touch', _touch, {
   cmdOptions: {
@@ -14,25 +14,32 @@ common.register('touch', _touch, {
 //@
 //@ ### touch([options,] file [, file ...])
 //@ ### touch([options,] file_array)
+//@
 //@ Available options:
 //@
 //@ + `-a`: Change only the access time
 //@ + `-c`: Do not create any files
 //@ + `-m`: Change only the modification time
-//@ + `-d DATE`: Parse DATE and use it instead of current time
-//@ + `-r FILE`: Use FILE's times instead of current time
+//@ + `{'-d': someDate}`, `{date: someDate}`: Use a `Date` instance (ex. `someDate`)
+//@   instead of current time
+//@ + `{'-r': file}`, `{reference: file}`: Use `file`'s times instead of current
+//@   time
 //@
 //@ Examples:
 //@
 //@ ```javascript
 //@ touch('source.js');
-//@ touch('-c', '/path/to/some/dir/source.js');
-//@ touch({ '-r': FILE }, '/path/to/some/dir/source.js');
+//@ touch('-c', 'path/to/file.js');
+//@ touch({ '-r': 'referenceFile.txt' }, 'path/to/file.js');
+//@ touch({ '-d': new Date('December 17, 1995 03:24:00'), '-m': true }, 'path/to/file.js');
+//@ touch({ date: new Date('December 17, 1995 03:24:00') }, 'path/to/file.js');
 //@ ```
 //@
-//@ Update the access and modification times of each FILE to the current time.
-//@ A FILE argument that does not exist is created empty, unless -c is supplied.
-//@ This is a partial implementation of *[touch(1)](http://linux.die.net/man/1/touch)*.
+//@ Update the access and modification times of each file to the current time.
+//@ A file argument that does not exist is created empty, unless `-c` is supplied.
+//@ This is a partial implementation of
+//@ [`touch(1)`](http://linux.die.net/man/1/touch). Returns a
+//@ [ShellString](#shellstringstr) indicating success or failure.
 function _touch(opts, files) {
   if (!files) {
     common.error('no files given');
@@ -103,7 +110,7 @@ module.exports = _touch;
 
 function tryStatFile(filePath) {
   try {
-    return fs.statSync(filePath);
+    return common.statFollowLinks(filePath);
   } catch (e) {
     return null;
   }
diff --git a/src/uniq.js b/src/uniq.js
index 8f5da0028..580270651 100644
--- a/src/uniq.js
+++ b/src/uniq.js
@@ -1,5 +1,5 @@
-var common = require('./common');
 var fs = require('fs');
+var common = require('./common');
 
 // add c spaces to the left of str
 function lpad(c, str) {
@@ -21,6 +21,7 @@ common.register('uniq', _uniq, {
 
 //@
 //@ ### uniq([options,] [input, [output]])
+//@
 //@ Available options:
 //@
 //@ + `-i`: Ignore case while comparing
@@ -35,16 +36,28 @@ common.register('uniq', _uniq, {
 //@ uniq('-cd', 'foo.txt', 'bar.txt');
 //@ ```
 //@
-//@ Filter adjacent matching lines from input
+//@ Filter adjacent matching lines from `input`. Returns a
+//@ [ShellString](#shellstringstr).
 function _uniq(options, input, output) {
   // Check if this is coming from a pipe
   var pipe = common.readFromPipe();
 
-  if (!input && !pipe) common.error('no input given');
+  if (!pipe) {
+    if (!input) common.error('no input given');
+
+    if (!fs.existsSync(input)) {
+      common.error(input + ': No such file or directory');
+    } else if (common.statFollowLinks(input).isDirectory()) {
+      common.error("error reading '" + input + "'");
+    }
+  }
+  if (output && fs.existsSync(output) && common.statFollowLinks(output).isDirectory()) {
+    common.error(output + ': Is a directory');
+  }
 
-  var lines = (input ? fs.readFileSync(input, 'utf8') : pipe).
-              trimRight().
-              split(/\r*\n/);
+  var lines = (input ? fs.readFileSync(input, 'utf8') : pipe)
+              .trimRight()
+              .split('\n');
 
   var compare = function (a, b) {
     return options.ignoreCase ?
diff --git a/src/which.js b/src/which.js
index ef5d185eb..8ac7b77e5 100644
--- a/src/which.js
+++ b/src/which.js
@@ -1,28 +1,45 @@
-var common = require('./common');
 var fs = require('fs');
 var path = require('path');
+var common = require('./common');
 
 common.register('which', _which, {
   allowGlobbing: false,
+  cmdOptions: {
+    'a': 'all',
+  },
 });
 
-// XP's system default value for PATHEXT system variable, just in case it's not
+// XP's system default value for `PATHEXT` system variable, just in case it's not
 // set on Windows.
 var XP_DEFAULT_PATHEXT = '.com;.exe;.bat;.cmd;.vbs;.vbe;.js;.jse;.wsf;.wsh';
 
-// Cross-platform method for splitting environment PATH variables
+// For earlier versions of NodeJS that doesn't have a list of constants (< v6)
+var FILE_EXECUTABLE_MODE = 1;
+
+function isWindowsPlatform() {
+  return process.platform === 'win32';
+}
+
+// Cross-platform method for splitting environment `PATH` variables
 function splitPath(p) {
-  if (!p) return [];
+  return p ? p.split(path.delimiter) : [];
+}
 
-  if (common.platform === 'win') {
-    return p.split(';');
-  } else {
-    return p.split(':');
+// Tests are running all cases for this func but it stays uncovered by codecov due to unknown reason
+/* istanbul ignore next */
+function isExecutable(pathName) {
+  try {
+    // TODO(node-support): replace with fs.constants.X_OK once remove support for node < v6
+    fs.accessSync(pathName, FILE_EXECUTABLE_MODE);
+  } catch (err) {
+    return false;
   }
+  return true;
 }
 
 function checkPath(pathName) {
-  return fs.existsSync(pathName) && !fs.statSync(pathName).isDirectory();
+  return fs.existsSync(pathName) && !common.statFollowLinks(pathName).isDirectory()
+    && (isWindowsPlatform() || isExecutable(pathName));
 }
 
 //@
@@ -34,66 +51,69 @@ function checkPath(pathName) {
 //@ var nodeExec = which('node');
 //@ ```
 //@
-//@ Searches for `command` in the system's PATH. On Windows, this uses the
+//@ Searches for `command` in the system's `PATH`. On Windows, this uses the
 //@ `PATHEXT` variable to append the extension if it's not already executable.
-//@ Returns string containing the absolute path to the command.
+//@ Returns a [ShellString](#shellstringstr) containing the absolute path to
+//@ `command`.
 function _which(options, cmd) {
   if (!cmd) common.error('must specify command');
 
-  var pathEnv = process.env.path || process.env.Path || process.env.PATH;
-  var pathArray = splitPath(pathEnv);
-  var where = null;
+  var isWindows = isWindowsPlatform();
+  var pathArray = splitPath(process.env.PATH);
+
+  var queryMatches = [];
 
   // No relative/absolute paths provided?
-  if (cmd.search(/\//) === -1) {
+  if (!cmd.includes('/')) {
+    // Assume that there are no extensions to append to queries (this is the
+    // case for unix)
+    var pathExtArray = [''];
+    if (isWindows) {
+      // In case the PATHEXT variable is somehow not set (e.g.
+      // child_process.spawn with an empty environment), use the XP default.
+      var pathExtEnv = process.env.PATHEXT || XP_DEFAULT_PATHEXT;
+      pathExtArray = splitPath(pathExtEnv.toUpperCase());
+    }
+
     // Search for command in PATH
-    pathArray.forEach(function (dir) {
-      if (where) return; // already found it
+    for (var k = 0; k < pathArray.length; k++) {
+      // already found it
+      if (queryMatches.length > 0 && !options.all) break;
 
-      var attempt = path.resolve(dir, cmd);
+      var attempt = path.resolve(pathArray[k], cmd);
 
-      if (common.platform === 'win') {
+      if (isWindows) {
         attempt = attempt.toUpperCase();
+      }
 
-        // In case the PATHEXT variable is somehow not set (e.g.
-        // child_process.spawn with an empty environment), use the XP default.
-        var pathExtEnv = process.env.PATHEXT || XP_DEFAULT_PATHEXT;
-        var pathExtArray = splitPath(pathExtEnv.toUpperCase());
-        var i;
-
-        // If the extension is already in PATHEXT, just return that.
-        for (i = 0; i < pathExtArray.length; i++) {
-          var ext = pathExtArray[i];
-          if (attempt.slice(-ext.length) === ext && checkPath(attempt)) {
-            where = attempt;
-            return;
-          }
+      var match = attempt.match(/\.[^<>:"/|?*.]+$/);
+      if (match && pathExtArray.includes(match[0])) { // this is Windows-only
+        // The user typed a query with the file extension, like
+        // `which('node.exe')`
+        if (checkPath(attempt)) {
+          queryMatches.push(attempt);
+          break;
         }
-
-        // Cycle through the PATHEXT variable
-        var baseAttempt = attempt;
-        for (i = 0; i < pathExtArray.length; i++) {
-          attempt = baseAttempt + pathExtArray[i];
-          if (checkPath(attempt)) {
-            where = attempt;
-            return;
+      } else { // All-platforms
+        // Cycle through the PATHEXT array, and check each extension
+        // Note: the array is always [''] on Unix
+        for (var i = 0; i < pathExtArray.length; i++) {
+          var ext = pathExtArray[i];
+          var newAttempt = attempt + ext;
+          if (checkPath(newAttempt)) {
+            queryMatches.push(newAttempt);
+            break;
           }
         }
-      } else {
-        // Assume it's Unix-like
-        if (checkPath(attempt)) {
-          where = attempt;
-          return;
-        }
       }
-    });
+    }
+  } else if (checkPath(cmd)) { // a valid absolute or relative path
+    queryMatches.push(path.resolve(cmd));
   }
 
-  // Command not found anywhere?
-  if (!checkPath(cmd) && !where) return null;
-
-  where = where || path.resolve(cmd);
-
-  return where;
+  if (queryMatches.length > 0) {
+    return options.all ? queryMatches : queryMatches[0];
+  }
+  return options.all ? [] : null;
 }
 module.exports = _which;
diff --git a/test/.eslintrc.json b/test/.eslintrc.json
index fd8099cb3..1e28f5360 100644
--- a/test/.eslintrc.json
+++ b/test/.eslintrc.json
@@ -4,23 +4,40 @@
   },
   "extends": "airbnb-base",
   "rules": {
-    "import/no-mutable-exports": 0,
-    "global-require": 0,
-    "vars-on-top": 0,
-    "spaced-comment": [2, "always", { "markers": ["@", "@include"], "exceptions": ["@"] }],
-    "no-param-reassign": 0,
-    "no-console": 0,
-    "curly": 0,
-    "no-var": 2,
-    "prefer-const": 2,
-    "prefer-template": 0,
-    "prefer-arrow-callback": 0,
-    "no-underscore-dangle": 0,
-    "max-len": 0,
-    "new-cap": [2, {
+    "arrow-parens": "off",
+    "comma-dangle": "off",
+    "curly": "off",
+    "function-call-argument-newline": "off",
+    "function-paren-newline": "off",
+    "global-require": "off",
+    "import/no-dynamic-require": "off",
+    "import/no-mutable-exports": "off",
+    "import/no-unresolved": "off",
+    "indent": "off",
+    "max-len": "off",
+    "no-bitwise": "off",
+    "no-console": "off",
+    "no-multiple-empty-lines": "off",
+    "no-param-reassign": "off",
+    "no-plusplus": "off",
+    "no-underscore-dangle": "off",
+    "no-var": "error",
+    "operator-linebreak": "off",
+    "prefer-arrow-callback": "off",
+    "prefer-const": "error",
+    "prefer-destructuring": "off",
+    "prefer-numeric-literals": "off",
+    "prefer-template": "off",
+    "spaced-comment": ["error", "always", { "markers": ["@", "@include"], "exceptions": ["@"] }],
+    "vars-on-top": "off",
+    "new-cap": ["error", {
       "capIsNewExceptions": [
         "ShellString"
-      ]}
-    ]
+      ]
+    }],
+    "quotes": ["error", "single", {
+      "avoidEscape": true,
+      "allowTemplateLiterals": true
+    }]
   }
 }
diff --git a/test/cat.js b/test/cat.js
index 654b304cd..e077b9be9 100644
--- a/test/cat.js
+++ b/test/cat.js
@@ -1,8 +1,8 @@
-import fs from 'fs';
+const fs = require('fs');
 
-import test from 'ava';
+const test = require('ava');
 
-import shell from '..';
+const shell = require('..');
 
 shell.config.silent = true;
 
@@ -25,35 +25,95 @@ test('nonexistent file', t => {
   t.is(result.stderr, 'cat: no such file or directory: /asdfasdf');
 });
 
+test('directory', t => {
+  const result = shell.cat('test/resources/cat');
+  t.truthy(shell.error());
+  t.is(result.code, 1);
+  t.is(result.stderr, 'cat: test/resources/cat: Is a directory');
+});
+
 //
 // Valids
 //
 
 test('simple', t => {
-  const result = shell.cat('resources/cat/file1');
+  const result = shell.cat('test/resources/cat/file1');
   t.falsy(shell.error());
   t.is(result.code, 0);
   t.is(result.toString(), 'test1\n');
 });
 
 test('multiple files', t => {
-  const result = shell.cat('resources/cat/file2', 'resources/cat/file1');
+  const result = shell.cat('test/resources/cat/file2', 'test/resources/cat/file1');
   t.falsy(shell.error());
   t.is(result.code, 0);
   t.is(result.toString(), 'test2\ntest1\n');
 });
 
 test('multiple files, array syntax', t => {
-  const result = shell.cat(['resources/cat/file2', 'resources/cat/file1']);
+  const result = shell.cat(['test/resources/cat/file2', 'test/resources/cat/file1']);
   t.falsy(shell.error());
   t.is(result.code, 0);
   t.is(result.toString(), 'test2\ntest1\n');
 });
 
 test('glob', t => {
-  const result = shell.cat('resources/file*.txt');
+  const result = shell.cat('test/resources/file*.txt');
   t.falsy(shell.error());
   t.is(result.code, 0);
   t.truthy(result.search('test1') > -1); // file order might be random
   t.truthy(result.search('test2') > -1);
 });
+
+test('without EOF', t => {
+  const result = shell.cat('test/resources/cat/file3');
+  t.falsy(shell.error());
+  t.is(result.code, 0);
+  t.is(result.toString(), 'test3');
+});
+
+test('empty', t => {
+  const result = shell.cat('test/resources/cat/file5');
+  t.falsy(shell.error());
+  t.is(result.code, 0);
+  t.is(result.toString(), '');
+});
+
+//
+// With numbers
+//
+
+test('simple with numbers', t => {
+  const result = shell.cat('-n', 'test/resources/cat/file1');
+  t.falsy(shell.error());
+  t.is(result.code, 0);
+  t.is(result.toString(), '     1\ttest1\n');
+});
+
+test('simple twelve lines file with numbers', t => {
+  const result = shell.cat('-n', 'test/resources/cat/file4');
+  t.falsy(shell.error());
+  t.is(result.code, 0);
+  t.is(result.toString(), '     1\ttest4-01\n     2\ttest4-02\n     3\ttest4-03\n     4\ttest4-04\n     5\ttest4-05\n     6\ttest4-06\n     7\ttest4-07\n     8\ttest4-08\n     9\ttest4-09\n    10\ttest4-10\n    11\ttest4-11\n    12\ttest4-12\n');
+});
+
+test('multiple with numbers', t => {
+  const result = shell.cat('-n', 'test/resources/cat/file2', 'test/resources/cat/file1');
+  t.falsy(shell.error());
+  t.is(result.code, 0);
+  t.is(result.toString(), '     1\ttest2\n     2\ttest1\n');
+});
+
+test('simple numbers without EOF', t => {
+  const result = shell.cat('-n', 'test/resources/cat/file3');
+  t.falsy(shell.error());
+  t.is(result.code, 0);
+  t.is(result.toString(), '     1\ttest3');
+});
+
+test('multiple numbers without EOF', t => {
+  const result = shell.cat('-n', 'test/resources/cat/file3', 'test/resources/cat/file2', 'test/resources/cat/file1');
+  t.falsy(shell.error());
+  t.is(result.code, 0);
+  t.is(result.toString(), '     1\ttest3test2\n     2\ttest1\n');
+});
diff --git a/test/cd.js b/test/cd.js
index ca9e88910..53404e249 100644
--- a/test/cd.js
+++ b/test/cd.js
@@ -1,11 +1,11 @@
-import fs from 'fs';
-import path from 'path';
+const fs = require('fs');
+const os = require('os');
+const path = require('path');
 
-import test from 'ava';
+const test = require('ava');
 
-import shell from '..';
-import common from '../src/common';
-import utils from './utils/utils';
+const shell = require('..');
+const utils = require('./utils/utils');
 
 const cur = shell.pwd().toString();
 
@@ -34,11 +34,11 @@ test('nonexistent directory', t => {
 });
 
 test('file not dir', t => {
-  t.truthy(fs.existsSync('resources/file1')); // sanity check
-  const result = shell.cd('resources/file1'); // file, not dir
+  t.truthy(fs.existsSync('test/resources/file1')); // sanity check
+  const result = shell.cd('test/resources/file1'); // file, not dir
   t.truthy(shell.error());
   t.is(result.code, 1);
-  t.is(result.stderr, 'cd: not a directory: resources/file1');
+  t.is(result.stderr, 'cd: not a directory: test/resources/file1');
 });
 
 test('no previous dir', t => {
@@ -76,13 +76,13 @@ test('previous directory (-)', t => {
 
 test('cd + other commands', t => {
   t.falsy(fs.existsSync(`${t.context.tmp}/file1`));
-  let result = shell.cd('resources');
+  let result = shell.cd('test/resources');
   t.falsy(shell.error());
   t.is(result.code, 0);
-  result = shell.cp('file1', `../${t.context.tmp}`);
+  result = shell.cp('file1', `../../${t.context.tmp}`);
   t.falsy(shell.error());
   t.is(result.code, 0);
-  result = shell.cd(`../${t.context.tmp}`);
+  result = shell.cd(`../../${t.context.tmp}`);
   t.falsy(shell.error());
   t.is(result.code, 0);
   t.truthy(fs.existsSync('file1'));
@@ -90,16 +90,16 @@ test('cd + other commands', t => {
 
 test('Tilde expansion', t => {
   shell.cd('~');
-  t.is(process.cwd(), common.getUserHome());
+  t.is(process.cwd(), os.homedir());
   shell.cd('..');
-  t.not(process.cwd(), common.getUserHome());
+  t.not(process.cwd(), os.homedir());
   shell.cd('~'); // Change back to home
-  t.is(process.cwd(), common.getUserHome());
+  t.is(process.cwd(), os.homedir());
 });
 
 test('Goes to home directory if no arguments are passed', t => {
   const result = shell.cd();
   t.falsy(shell.error());
   t.is(result.code, 0);
-  t.is(process.cwd(), common.getUserHome());
+  t.is(process.cwd(), os.homedir());
 });
diff --git a/test/chmod.js b/test/chmod.js
index 3ed210e5b..660972c91 100644
--- a/test/chmod.js
+++ b/test/chmod.js
@@ -1,16 +1,17 @@
-import fs from 'fs';
+const fs = require('fs');
 
-import test from 'ava';
+const test = require('ava');
 
-import shell from '..';
-import utils from './utils/utils';
+const shell = require('..');
+const common = require('../src/common');
+const utils = require('./utils/utils');
 
 let TMP;
 const BITMASK = parseInt('777', 8);
 
 test.before(() => {
   TMP = utils.getTempDir();
-  shell.cp('-r', 'resources', TMP);
+  shell.cp('-r', 'test/resources', TMP);
   shell.config.silent = true;
 });
 
@@ -26,66 +27,66 @@ test('invalid permissions', t => {
   let result = shell.chmod('blah');
   t.truthy(shell.error());
   t.is(result.code, 1);
-  result = shell.chmod('893', `${TMP}/chmod`);  // invalid permissions - mode must be in octal
+  result = shell.chmod('893', `${TMP}/chmod`); // invalid permissions - mode must be in octal
   t.truthy(shell.error());
   t.is(result.code, 1);
 });
 
 test('Basic usage with octal codes', t => {
-  if (process.platform !== 'win32') {
+  utils.skipOnWin(t, () => {
     let result = shell.chmod('755', `${TMP}/chmod/file1`);
     t.is(result.code, 0);
     t.is(
-      fs.statSync(`${TMP}/chmod/file1`).mode & BITMASK,
+      common.statFollowLinks(`${TMP}/chmod/file1`).mode & BITMASK,
       parseInt('755', 8)
     );
     result = shell.chmod('644', `${TMP}/chmod/file1`);
     t.is(result.code, 0);
     t.is(
-      fs.statSync(`${TMP}/chmod/file1`).mode & BITMASK,
+      common.statFollowLinks(`${TMP}/chmod/file1`).mode & BITMASK,
       parseInt('644', 8)
     );
-  }
+  });
 });
 
 test('symbolic mode', t => {
-  if (process.platform !== 'win32') {
+  utils.skipOnWin(t, () => {
     let result = shell.chmod('o+x', `${TMP}/chmod/file1`);
     t.is(result.code, 0);
     t.is(
-      fs.statSync(`${TMP}/chmod/file1`).mode & parseInt('007', 8),
+      common.statFollowLinks(`${TMP}/chmod/file1`).mode & parseInt('007', 8),
       parseInt('005', 8)
     );
     result = shell.chmod('644', `${TMP}/chmod/file1`);
     t.is(result.code, 0);
-  }
+  });
 });
 
 test('symbolic mode, without group', t => {
-  if (process.platform !== 'win32') {
+  utils.skipOnWin(t, () => {
     let result = shell.chmod('+x', `${TMP}/chmod/file1`);
     t.is(result.code, 0);
     t.is(
-      fs.statSync(`${TMP}/chmod/file1`).mode & BITMASK,
+      common.statFollowLinks(`${TMP}/chmod/file1`).mode & BITMASK,
       parseInt('755', 8)
     );
     result = shell.chmod('644', `${TMP}/chmod/file1`);
     t.is(result.code, 0);
-  }
+  });
 });
 
 test('Test setuid', t => {
-  if (process.platform !== 'win32') {
+  utils.skipOnWin(t, () => {
     let result = shell.chmod('u+s', `${TMP}/chmod/file1`);
     t.is(result.code, 0);
     t.is(
-      fs.statSync(`${TMP}/chmod/file1`).mode & parseInt('4000', 8),
+      common.statFollowLinks(`${TMP}/chmod/file1`).mode & parseInt('4000', 8),
       parseInt('4000', 8)
     );
     result = shell.chmod('u-s', `${TMP}/chmod/file1`);
     t.is(result.code, 0);
     t.is(
-      fs.statSync(`${TMP}/chmod/file1`).mode & BITMASK,
+      common.statFollowLinks(`${TMP}/chmod/file1`).mode & BITMASK,
       parseInt('644', 8)
     );
 
@@ -97,103 +98,103 @@ test('Test setuid', t => {
     result = shell.chmod('755', `${TMP}/chmod/c`);
     t.is(result.code, 0);
     t.is(
-      fs.statSync(`${TMP}/chmod/c`).mode & parseInt('4000', 8),
+      common.statFollowLinks(`${TMP}/chmod/c`).mode & parseInt('4000', 8),
       parseInt('4000', 8)
     );
     result = shell.chmod('u-s', `${TMP}/chmod/c`);
     t.is(result.code, 0);
-  }
+  });
 });
 
 test('Test setgid', t => {
-  if (process.platform !== 'win32') {
+  utils.skipOnWin(t, () => {
     let result = shell.chmod('g+s', `${TMP}/chmod/file1`);
     t.is(result.code, 0);
     t.is(
-      fs.statSync(`${TMP}/chmod/file1`).mode & parseInt('2000', 8),
+      common.statFollowLinks(`${TMP}/chmod/file1`).mode & parseInt('2000', 8),
       parseInt('2000', 8)
     );
     result = shell.chmod('g-s', `${TMP}/chmod/file1`);
     t.is(result.code, 0);
     t.is(
-      fs.statSync(`${TMP}/chmod/file1`).mode & BITMASK,
+      common.statFollowLinks(`${TMP}/chmod/file1`).mode & BITMASK,
       parseInt('644', 8)
     );
-  }
+  });
 });
 
 test('Test sticky bit', t => {
-  if (process.platform !== 'win32') {
+  utils.skipOnWin(t, () => {
     let result = shell.chmod('+t', `${TMP}/chmod/file1`);
     t.is(result.code, 0);
     t.is(
-      fs.statSync(`${TMP}/chmod/file1`).mode & parseInt('1000', 8),
+      common.statFollowLinks(`${TMP}/chmod/file1`).mode & parseInt('1000', 8),
       parseInt('1000', 8)
     );
     result = shell.chmod('-t', `${TMP}/chmod/file1`);
     t.is(result.code, 0);
     t.is(
-      fs.statSync(`${TMP}/chmod/file1`).mode & BITMASK,
+      common.statFollowLinks(`${TMP}/chmod/file1`).mode & BITMASK,
       parseInt('644', 8)
     );
-    t.is(fs.statSync(`${TMP}/chmod/file1`).mode & parseInt('1000', 8), 0);
-  }
+    t.is(common.statFollowLinks(`${TMP}/chmod/file1`).mode & parseInt('1000', 8), 0);
+  });
 });
 
 test('Test directories', t => {
-  if (process.platform !== 'win32') {
+  utils.skipOnWin(t, () => {
     let result = shell.chmod('a-w', `${TMP}/chmod/b/a/b`);
     t.is(result.code, 0);
     t.is(
-      fs.statSync(`${TMP}/chmod/b/a/b`).mode & BITMASK,
+      common.statFollowLinks(`${TMP}/chmod/b/a/b`).mode & BITMASK,
       parseInt('555', 8)
     );
     result = shell.chmod('755', `${TMP}/chmod/b/a/b`);
     t.is(result.code, 0);
-  }
+  });
 });
 
 test('Test recursion', t => {
-  if (process.platform !== 'win32') {
+  utils.skipOnWin(t, () => {
     let result = shell.chmod('-R', 'a+w', `${TMP}/chmod/b`);
     t.is(result.code, 0);
     t.is(
-      fs.statSync(`${TMP}/chmod/b/a/b`).mode & BITMASK,
+      common.statFollowLinks(`${TMP}/chmod/b/a/b`).mode & BITMASK,
       BITMASK
     );
     result = shell.chmod('-R', '755', `${TMP}/chmod/b`);
     t.is(result.code, 0);
     t.is(
-      fs.statSync(`${TMP}/chmod/b/a/b`).mode & BITMASK,
+      common.statFollowLinks(`${TMP}/chmod/b/a/b`).mode & BITMASK,
       parseInt('755', 8)
     );
-  }
+  });
 });
 
 test('Test symbolic links w/ recursion  - WARNING: *nix only', t => {
-  if (process.platform !== 'win32') {
+  utils.skipOnWin(t, () => {
     fs.symlinkSync(`${TMP}/chmod/b/a`, `${TMP}/chmod/a/b/c/link`, 'dir');
     let result = shell.chmod('-R', 'u-w', `${TMP}/chmod/a/b`);
     t.is(result.code, 0);
     t.is(
-      fs.statSync(`${TMP}/chmod/a/b/c`).mode & parseInt('700', 8),
+      common.statFollowLinks(`${TMP}/chmod/a/b/c`).mode & parseInt('700', 8),
       parseInt('500', 8)
     );
     t.is(
-      fs.statSync(`${TMP}/chmod/b/a`).mode & parseInt('700', 8),
+      common.statFollowLinks(`${TMP}/chmod/b/a`).mode & parseInt('700', 8),
       parseInt('700', 8)
     );
     result = shell.chmod('-R', 'u+w', `${TMP}/chmod/a/b`);
     t.is(result.code, 0);
     fs.unlinkSync(`${TMP}/chmod/a/b/c/link`);
-  }
+  });
 });
 
 test('Test combinations', t => {
   let result = shell.chmod('a-rwx', `${TMP}/chmod/file1`);
   t.is(result.code, 0);
   t.is(
-    fs.statSync(`${TMP}/chmod/file1`).mode & parseInt('000', 8),
+    common.statFollowLinks(`${TMP}/chmod/file1`).mode & parseInt('000', 8),
     parseInt('000', 8)
   );
   result = shell.chmod('644', `${TMP}/chmod/file1`);
@@ -204,7 +205,7 @@ test('multiple symbolic modes', t => {
   let result = shell.chmod('a-rwx,u+r', `${TMP}/chmod/file1`);
   t.is(result.code, 0);
   t.is(
-    fs.statSync(`${TMP}/chmod/file1`).mode & parseInt('400', 8),
+    common.statFollowLinks(`${TMP}/chmod/file1`).mode & parseInt('400', 8),
     parseInt('400', 8)
   );
   result = shell.chmod('644', `${TMP}/chmod/file1`);
@@ -215,7 +216,7 @@ test('multiple symbolic modes #2', t => {
   let result = shell.chmod('a-rwx,u+rw', `${TMP}/chmod/file1`);
   t.is(result.code, 0);
   t.is(
-    fs.statSync(`${TMP}/chmod/file1`).mode & parseInt('600', 8),
+    common.statFollowLinks(`${TMP}/chmod/file1`).mode & parseInt('600', 8),
     parseInt('600', 8)
   );
   result = shell.chmod('644', `${TMP}/chmod/file1`);
@@ -223,16 +224,16 @@ test('multiple symbolic modes #2', t => {
 });
 
 test('multiple symbolic modes #3', t => {
-  if (process.platform !== 'win32') {
+  utils.skipOnWin(t, () => {
     let result = shell.chmod('a-rwx,u+rwx', `${TMP}/chmod/file1`);
     t.is(result.code, 0);
     t.is(
-      fs.statSync(`${TMP}/chmod/file1`).mode & parseInt('700', 8),
+      common.statFollowLinks(`${TMP}/chmod/file1`).mode & parseInt('700', 8),
       parseInt('700', 8)
     );
     result = shell.chmod('644', `${TMP}/chmod/file1`);
     t.is(result.code, 0);
-  }
+  });
 });
 
 test('u+rw', t => {
@@ -241,7 +242,7 @@ test('u+rw', t => {
   result = shell.chmod('u+rw', `${TMP}/chmod/file1`);
   t.is(result.code, 0);
   t.is(
-    fs.statSync(`${TMP}/chmod/file1`).mode & parseInt('600', 8),
+    common.statFollowLinks(`${TMP}/chmod/file1`).mode & parseInt('600', 8),
     parseInt('600', 8)
   );
   result = shell.chmod('644', `${TMP}/chmod/file1`);
@@ -249,48 +250,48 @@ test('u+rw', t => {
 });
 
 test('u+wx', t => {
-  if (process.platform !== 'win32') {
+  utils.skipOnWin(t, () => {
     let result = shell.chmod('000', `${TMP}/chmod/file1`);
     t.is(result.code, 0);
     result = shell.chmod('u+wx', `${TMP}/chmod/file1`);
     t.is(result.code, 0);
     t.is(
-      fs.statSync(`${TMP}/chmod/file1`).mode & parseInt('300', 8),
+      common.statFollowLinks(`${TMP}/chmod/file1`).mode & parseInt('300', 8),
       parseInt('300', 8)
     );
     result = shell.chmod('644', `${TMP}/chmod/file1`);
     t.is(result.code, 0);
-  }
+  });
 });
 
 test('Multiple symbolic modes at once', t => {
-  if (process.platform !== 'win32') {
+  utils.skipOnWin(t, () => {
     let result = shell.chmod('000', `${TMP}/chmod/file1`);
     t.is(result.code, 0);
     result = shell.chmod('u+r,g+w,o+x', `${TMP}/chmod/file1`);
     t.is(result.code, 0);
     t.is(
-      fs.statSync(`${TMP}/chmod/file1`).mode & parseInt('421', 8),
+      common.statFollowLinks(`${TMP}/chmod/file1`).mode & parseInt('421', 8),
       parseInt('421', 8)
     );
     result = shell.chmod('644', `${TMP}/chmod/file1`);
     t.is(result.code, 0);
-  }
+  });
 });
 
 test('u+rw,g+wx', t => {
-  if (process.platform !== 'win32') {
+  utils.skipOnWin(t, () => {
     let result = shell.chmod('000', `${TMP}/chmod/file1`);
     t.is(result.code, 0);
     result = shell.chmod('u+rw,g+wx', `${TMP}/chmod/file1`);
     t.is(result.code, 0);
     t.is(
-      fs.statSync(`${TMP}/chmod/file1`).mode & parseInt('630', 8),
+      common.statFollowLinks(`${TMP}/chmod/file1`).mode & parseInt('630', 8),
       parseInt('630', 8)
     );
     result = shell.chmod('644', `${TMP}/chmod/file1`);
     t.is(result.code, 0);
-  }
+  });
 });
 
 test('u-x,g+rw', t => {
@@ -299,7 +300,7 @@ test('u-x,g+rw', t => {
   result = shell.chmod('u-x,g+rw', `${TMP}/chmod/file1`);
   t.is(result.code, 0);
   t.is(
-    fs.statSync(`${TMP}/chmod/file1`).mode & parseInt('660', 8),
+    common.statFollowLinks(`${TMP}/chmod/file1`).mode & parseInt('660', 8),
     parseInt('660', 8)
   );
   result = shell.chmod('644', `${TMP}/chmod/file1`);
@@ -310,13 +311,13 @@ test('a-rwx,u+rw', t => {
   let result = shell.chmod('a-rwx,u+rw', `${TMP}/chmod/file1`);
   t.is(result.code, 0);
   t.is(
-    fs.statSync(`${TMP}/chmod/file1`).mode & parseInt('600', 8),
+    common.statFollowLinks(`${TMP}/chmod/file1`).mode & parseInt('600', 8),
     parseInt('600', 8)
   );
   result = shell.chmod('a-rwx,u+rw', `${TMP}/chmod/file1`);
   t.is(result.code, 0);
   t.is(
-    fs.statSync(`${TMP}/chmod/file1`).mode & parseInt('600', 8),
+    common.statFollowLinks(`${TMP}/chmod/file1`).mode & parseInt('600', 8),
     parseInt('600', 8)
   );
   result = shell.chmod('644', `${TMP}/chmod/file1`);
@@ -337,22 +338,22 @@ test('Numeric modes', t => {
 });
 
 test('Make sure chmod succeeds for a variety of octal codes', t => {
-  if (process.platform !== 'win32') {
+  utils.skipOnWin(t, () => {
     t.is(
-      fs.statSync(`${TMP}/chmod/xdir`).mode & parseInt('755', 8),
+      common.statFollowLinks(`${TMP}/chmod/xdir`).mode & parseInt('755', 8),
       parseInt('755', 8)
     );
     t.is(
-      fs.statSync(`${TMP}/chmod/xdir/file`).mode & parseInt('644', 8),
+      common.statFollowLinks(`${TMP}/chmod/xdir/file`).mode & parseInt('644', 8),
       parseInt('644', 8)
     );
     t.is(
-      fs.statSync(`${TMP}/chmod/xdir/deep`).mode & parseInt('755', 8),
+      common.statFollowLinks(`${TMP}/chmod/xdir/deep`).mode & parseInt('755', 8),
       parseInt('755', 8)
     );
     t.is(
-      fs.statSync(`${TMP}/chmod/xdir/deep/file`).mode & parseInt('644', 8),
+      common.statFollowLinks(`${TMP}/chmod/xdir/deep/file`).mode & parseInt('644', 8),
       parseInt('644', 8)
     );
-  }
+  });
 });
diff --git a/test/cmd.js b/test/cmd.js
new file mode 100644
index 000000000..f49c98873
--- /dev/null
+++ b/test/cmd.js
@@ -0,0 +1,279 @@
+const path = require('path');
+
+const test = require('ava');
+
+const shell = require('..');
+
+const CWD = process.cwd();
+
+test.beforeEach(() => {
+  process.chdir(CWD);
+  shell.config.resetForTesting();
+});
+
+//
+// Invalids
+//
+
+test('no args', t => {
+  shell.cmd();
+  t.truthy(shell.error());
+});
+
+test('unknown command', t => {
+  const result = shell.cmd('asdfasdf'); // could not find command
+  t.truthy(result.code > 0);
+  t.is(result.code, 127);
+});
+
+test('config.fatal and unknown command', t => {
+  shell.config.fatal = true;
+  t.throws(() => {
+    shell.cmd('asdfasdf'); // could not find command
+  }, { message: /.*command not found.*/ });
+});
+
+// TODO(nfischer): enable only if we implement realtime output + captured
+// output.
+test.skip('cmd exits gracefully if we cannot find the execPath', t => {
+  shell.config.execPath = null;
+  shell.cmd('shx', 'echo', 'foo');
+  t.regex(
+    shell.error(),
+    /Unable to find a path to the node binary\. Please manually set config\.execPath/
+  );
+});
+
+//
+// Valids
+//
+
+//
+// sync
+//
+
+test('check if stdout goes to output', t => {
+  const result = shell.cmd('shx', 'echo', 'this is stdout');
+  t.falsy(shell.error());
+  t.is(result.code, 0);
+  t.is(result.stdout, 'this is stdout\n');
+});
+
+test('check if stderr goes to output', t => {
+  const result = shell.cmd(shell.config.execPath, '-e', 'console.error("1234");');
+  t.falsy(shell.error());
+  t.is(result.code, 0);
+  t.is(result.stdout, '');
+  t.is(result.stderr, '1234\n');
+});
+
+test('check if stdout + stderr go to output', t => {
+  const result = shell.cmd(shell.config.execPath, '-e', 'console.error(1234); console.log(666);');
+  t.falsy(shell.error());
+  t.is(result.code, 0);
+  t.is(result.stdout, '666\n');
+  t.is(result.stderr, '1234\n');
+});
+
+test('check exit code', t => {
+  const result = shell.cmd(shell.config.execPath, '-e', 'process.exit(12);');
+  t.truthy(shell.error());
+  t.is(result.code, 12);
+});
+
+test('interaction with cd', t => {
+  shell.cd('test/resources/external');
+  const result = shell.cmd(shell.config.execPath, 'node_script.js');
+  t.falsy(shell.error());
+  t.is(result.code, 0);
+  t.is(result.stdout, 'node_script_1234\n');
+});
+
+test('no need to escape quotes', t => {
+  const result = shell.cmd(shell.config.execPath, '-e',
+      `console.log("'+'_'+'");`);
+  t.falsy(shell.error());
+  t.is(result.code, 0);
+  t.is(result.stdout, "'+'_'+'\n");
+});
+
+test('commands can contain newlines', t => {
+  // GitHub issue #175. This test uses a nodejs script rather than a shell
+  // command because Windows 'echo' doesn't handle \n the same way as Unix
+  // 'echo'. This test case proves the newline is passed correctly to the
+  // underlying program because otherwise node would not parse the two lines as
+  // separate statements and it would throw a JavaScript syntax error.
+  const result = shell.cmd(shell.config.execPath, '-e', `
+console.log('line1')
+console.log('line2')
+`);
+  t.falsy(shell.error());
+  t.is(result.code, 0);
+  t.is(result.stdout, 'line1\nline2\n');
+});
+
+test('does not expand shell-style variables', t => {
+  shell.env.FOO = 'Hello world';
+  const result = shell.cmd('shx', 'echo', '$FOO');
+  t.falsy(shell.error());
+  t.is(result.code, 0);
+  t.is(result.stdout, '$FOO\n');
+});
+
+test('does not expand windows-style variables', t => {
+  shell.env.FOO = 'Hello world';
+  let result = shell.cmd('shx', 'echo', '%FOO%');
+  t.falsy(shell.error());
+  t.is(result.code, 0);
+  t.is(result.stdout, '%FOO%\n');
+  result = shell.cmd('shx', 'echo', '!FOO!');
+  t.falsy(shell.error());
+  t.is(result.code, 0);
+  t.is(result.stdout, '!FOO!\n');
+});
+
+test('caret character is passed through to the command', t => {
+  // '^' is a special character on Windows, see issue #1015
+  const result = shell.cmd('shx', 'echo', 'shelljs@^0.8.4');
+  t.falsy(shell.error());
+  t.is(result.code, 0);
+  t.is(result.stdout, 'shelljs@^0.8.4\n');
+});
+
+test('cannot inject multiple commands', t => {
+  const injection = '; echo semicolon && echo and || echo or';
+  const result = shell.cmd('shx', 'echo', `hi${injection}`);
+  t.falsy(shell.error());
+  t.is(result.code, 0);
+  t.is(result.stdout, `hi${injection}\n`);
+});
+
+test('supports globbing by default', t => {
+  // `echo` on windows will not glob, so it depends on shell.cmd() to expand the
+  // glob before spawning the subprocess.
+  const result = shell.cmd('shx', 'echo', 'test/resources/*.txt');
+  t.falsy(shell.error());
+  t.is(result.code, 0);
+  const expectedFiles = [
+    'test/resources/a.txt',
+    'test/resources/file1.txt',
+    'test/resources/file2.txt',
+  ];
+  t.is(result.stdout, `${expectedFiles.join(' ')}\n`);
+});
+
+test('globbing respects config.noglob', t => {
+  shell.config.noglob = true;
+  const result = shell.cmd('shx', 'echo', 'test/resources/*.txt');
+  t.falsy(shell.error());
+  t.is(result.code, 0);
+  t.is(result.stdout, 'test/resources/*.txt\n');
+});
+
+test('set cwd', t => {
+  const result = shell.cmd('shx', 'pwd', { cwd: '..' });
+  t.falsy(shell.error());
+  t.is(result.code, 0);
+  t.is(result.stdout, path.resolve('..') + '\n');
+});
+
+test('command fails silently with non-zero status', t => {
+  const result = shell.cmd('shx', 'false');
+  t.truthy(shell.error());
+  t.is(result.code, 1);
+  t.is(result.stdout, '');
+  t.is(result.stderr, '');
+});
+
+test('set maxBuffer (very small)', t => {
+  let result = shell.cmd('shx', 'echo', '1234567890'); // default maxBuffer is ok
+  t.falsy(shell.error());
+  t.is(result.code, 0);
+  t.is(result.stdout, '1234567890\n');
+  result = shell.cmd('shx', 'echo', '1234567890', { maxBuffer: 6 });
+  t.truthy(shell.error());
+  t.is(result.code, 1);
+  t.is(result.stdout, '1234567890\n');
+});
+
+test('set timeout option', t => {
+  let result = shell.cmd(shell.config.execPath, 'test/resources/exec/slow.js', '100'); // default timeout is ok
+  t.falsy(shell.error());
+  t.is(result.stdout, 'fast\nslow\n');
+  t.is(result.code, 0);
+  result = shell.cmd(shell.config.execPath, 'test/resources/exec/slow.js', '2000', { timeout: 1000 }); // times out
+  t.truthy(shell.error());
+  t.is(result.stdout, 'fast\n');
+  t.truthy(result.stderr);
+  t.is(result.code, 1);
+});
+
+test('check process.env works', t => {
+  shell.env.FOO = 'Hello world';
+  // Launch any sub process, and process.env should be propagated through.
+  const result =
+    shell.cmd(shell.config.execPath, '-p', 'process.env.FOO');
+  t.falsy(shell.error());
+  t.is(result.code, 0);
+  t.is(result.stdout, 'Hello world\n');
+  t.is(result.stderr, '');
+});
+
+test('cmd returns a ShellString', t => {
+  const result = shell.cmd('shx', 'echo', 'foo');
+  t.is(typeof result, 'object');
+  t.truthy(result instanceof String);
+  t.is(typeof result.stdout, 'string');
+  t.is(result.toString(), result.stdout);
+});
+
+//
+// async
+//
+
+function cmdAsync(...commandArgs) {
+  return new Promise((resolve) => {
+    shell.cmd(...commandArgs, (code, stdout, stderr) => {
+      resolve({ code, stdout, stderr });
+    });
+  });
+}
+
+// TODO(nfischer): enable after we implement async.
+test.skip('no callback', t => {
+  const c = shell.cmd(shell.config.execPath, '-e', 'console.log(1234)', { async: true });
+  t.falsy(shell.error());
+  t.truthy('stdout' in c, 'async exec returns child process object');
+});
+
+// TODO(nfischer): enable after we implement async.
+test.skip('callback as 2nd argument', async t => {
+  const result = await cmdAsync(shell.config.execPath, '-e', 'console.log(5678);');
+  t.is(result.code, 0);
+  t.is(result.stdout, '5678\n');
+  t.is(result.stderr, '');
+});
+
+// TODO(nfischer): enable after we implement async.
+test.skip('callback as end argument', async t => {
+  const result = await cmdAsync(shell.config.execPath, '-e', 'console.log(5566);', { async: true });
+  t.is(result.code, 0);
+  t.is(result.stdout, '5566\n');
+  t.is(result.stderr, '');
+});
+
+// TODO(nfischer): enable after we implement async.
+test.skip('callback as 3rd argument (silent:true)', async t => {
+  const result = await cmdAsync(shell.config.execPath, '-e', 'console.log(5678);', { silent: true });
+  t.is(result.code, 0);
+  t.is(result.stdout, '5678\n');
+  t.is(result.stderr, '');
+});
+
+// TODO(nfischer): enable after we implement async.
+test.skip('command that fails', async t => {
+  const result = await cmdAsync('shx', 'cp', 'onlyOneCpArgument.txt', { silent: true });
+  t.is(result.code, 1);
+  t.is(result.stdout, '');
+  t.is(result.stderr, 'cp: missing <source> and/or <dest>\n');
+});
diff --git a/test/common.js b/test/common.js
index 2bb4a7600..8fc836590 100644
--- a/test/common.js
+++ b/test/common.js
@@ -1,10 +1,18 @@
-import test from 'ava';
+const test = require('ava');
 
-import shell from '..';
-import common from '../src/common';
-import utils from './utils/utils';
+const shell = require('..');
+const common = require('../src/common');
+const utils = require('./utils/utils');
 
-shell.config.silent = true;
+test.beforeEach(() => {
+  shell.config.silent = true;
+  common.state.error = null;
+  common.state.errorCode = 0;
+});
+
+test.afterEach(() => {
+  common.config.resetForTesting();
+});
 
 //
 // Invalids
@@ -13,50 +21,208 @@ shell.config.silent = true;
 test('too few args', t => {
   t.throws(() => {
     common.expand();
-  }, TypeError);
+  }, { instanceOf: TypeError });
 });
 
 test('should be a list', t => {
   t.throws(() => {
-    common.expand('resources');
-  }, TypeError);
+    common.expand('test/resources');
+  }, { instanceOf: TypeError });
+});
+
+test('parseOptions (invalid option in options object)', t => {
+  t.throws(() => {
+    common.parseOptions({ q: 'some string value' }, {
+      R: 'recursive',
+      f: 'force',
+      r: 'reverse',
+    });
+  }, { instanceOf: common.CommandError });
+});
+
+test('parseOptions (without a hyphen in the string)', t => {
+  t.throws(() => {
+    common.parseOptions('f', {
+      f: 'force',
+    });
+  }, { instanceOf: Error });
+});
+
+test('parseOptions (opt is not a string/object)', t => {
+  t.throws(() => {
+    common.parseOptions(1, {
+      f: 'force',
+    });
+  }, { instanceOf: TypeError });
+});
+
+test('parseOptions (map is not an object)', t => {
+  t.throws(() => {
+    common.parseOptions('-f', 27);
+  }, { instanceOf: TypeError });
+});
+
+test('parseOptions (errorOptions is not an object)', t => {
+  t.throws(() => {
+    common.parseOptions('-f', {
+      f: 'force',
+    }, 'not a valid errorOptions');
+  }, { instanceOf: TypeError });
+});
+
+test('parseOptions (unrecognized string option)', t => {
+  t.throws(() => {
+    common.parseOptions('-z', {
+      f: 'force',
+    });
+  }, { instanceOf: common.CommandError });
+});
+
+test('parseOptions (unrecognized option in Object)', t => {
+  t.throws(() => {
+    common.parseOptions({ '-c': 7 }, {
+      f: 'force',
+    });
+  });
+});
+
+test('parseOptions (invalid type)', t => {
+  t.throws(() => {
+    common.parseOptions(12, {
+      R: 'recursive',
+      f: 'force',
+      r: 'reverse',
+    });
+  });
+});
+
+test('convertErrorOutput: no args', t => {
+  t.throws(() => {
+    common.convertErrorOutput();
+  }, { instanceOf: TypeError });
+});
+
+test('convertErrorOutput: input must be a vanilla string', t => {
+  t.throws(() => {
+    common.convertErrorOutput(3);
+  }, { instanceOf: TypeError });
+
+  t.throws(() => {
+    common.convertErrorOutput({});
+  }, { instanceOf: TypeError });
 });
 
 //
 // Valids
 //
 
+//
+// common.convertErrorOutput()
+//
+test('convertErrorOutput: nothing to convert', t => {
+  const input = 'hello world';
+  const result = common.convertErrorOutput(input);
+  t.is(result, input);
+});
+
+test('convertErrorOutput: does not change forward slash', t => {
+  const input = 'dir/sub/file.txt';
+  const result = common.convertErrorOutput(input);
+  t.is(result, input);
+});
+
+test('convertErrorOutput: changes backslashes to forward slashes', t => {
+  const input = 'dir\\sub\\file.txt';
+  const result = common.convertErrorOutput(input);
+  t.is(result, 'dir/sub/file.txt');
+});
+
+//
+// common.expand()
+//
 test('single file, array syntax', t => {
-  const result = common.expand(['resources/file1.txt']);
-  t.falsy(shell.error());
-  t.deepEqual(result, ['resources/file1.txt']);
+  const result = common.expand(['test/resources/file1.txt']);
+  t.deepEqual(result, ['test/resources/file1.txt']);
 });
 
 test('multiple file, glob syntax, * for file name', t => {
-  const result = common.expand(['resources/file*.txt']);
-  t.falsy(shell.error());
-  t.deepEqual(result.sort(), ['resources/file1.txt', 'resources/file2.txt'].sort());
+  const result = common.expand(['test/resources/file*.txt']);
+  t.deepEqual(result.sort(), ['test/resources/file1.txt', 'test/resources/file2.txt'].sort());
 });
 
 test('multiple file, glob syntax, * for directory name', t => {
-  const result = common.expand(['r*/file*.txt']);
-  t.falsy(shell.error());
-  t.deepEqual(result.sort(), ['resources/file1.txt', 'resources/file2.txt'].sort());
+  const result = common.expand(['test/r*/file*.txt']);
+  t.deepEqual(result.sort(), ['test/resources/file1.txt', 'test/resources/file2.txt'].sort());
 });
 
 test('multiple file, glob syntax, ** for directory name', t => {
-  const result = common.expand(['resources/**/file*.js']);
-  t.falsy(shell.error());
+  const result = common.expand(['test/resources/**/file*.js']);
   t.deepEqual(
     result.sort(),
-    ['resources/file1.js', 'resources/file2.js', 'resources/ls/file1.js', 'resources/ls/file2.js'].sort()
+    ['test/resources/file1.js', 'test/resources/file2.js', 'test/resources/ls/file1.js', 'test/resources/ls/file2.js'].sort()
   );
 });
 
 test('broken links still expand', t => {
-  const result = common.expand(['resources/b*dlink']);
-  t.falsy(shell.error());
-  t.deepEqual(result, ['resources/badlink']);
+  const result = common.expand(['test/resources/b*dlink']);
+  t.deepEqual(result, ['test/resources/badlink']);
+});
+
+test('glob syntax, ? for single char in directory name', t => {
+  const result = common.expand(['test/r?sources/file1.txt']);
+  t.deepEqual(result, ['test/resources/file1.txt']);
+});
+
+test('glob syntax, ? for single char in directory name with * in file name', t => {
+  const result = common.expand(['test/r?sources/file*.txt']);
+  t.deepEqual(result.sort(), ['test/resources/file1.txt', 'test/resources/file2.txt'].sort());
+});
+
+test('glob syntax, ? in multiple path segments', t => {
+  const result = common.expand(['test/r?sources/file?.txt']);
+  t.deepEqual(result.sort(), ['test/resources/file1.txt', 'test/resources/file2.txt'].sort());
+});
+
+test('glob syntax, ? in file name still works', t => {
+  const result = common.expand(['test/resources/file?.txt']);
+  t.deepEqual(result.sort(), ['test/resources/file1.txt', 'test/resources/file2.txt'].sort());
+});
+
+test('empty array', t => {
+  const result = common.expand([]);
+  t.deepEqual(result, []);
+});
+
+test('empty string', t => {
+  const result = common.expand(['']);
+  t.deepEqual(result, ['']);
+});
+
+test('non-string', t => {
+  const result = common.expand([5]);
+  t.deepEqual(result, [5]);
+});
+
+//
+// common.buffer()
+//
+test('common.buffer returns buffer', t => {
+  const buf = common.buffer();
+  t.truthy(buf instanceof Buffer);
+  t.is(buf.length, 64 * 1024);
+});
+
+test('common.buffer with explicit length', t => {
+  const buf = common.buffer(20);
+  t.truthy(buf instanceof Buffer);
+  t.is(buf.length, 20);
+});
+
+test('common.buffer with different config.bufLength', t => {
+  common.config.bufLength = 20;
+  const buf = common.buffer();
+  t.truthy(buf instanceof Buffer);
+  t.is(buf.length, 20);
 });
 
 test('common.parseOptions (normal case)', t => {
@@ -114,34 +280,80 @@ test('common.parseOptions using an object to hold options', t => {
   t.false(result.reverse);
 });
 
+test('common.parseOptions throws when passed a string not starting with "-"', t => {
+  t.throws(() => {
+    common.parseOptions('a', { '-a': 'throws' });
+  }, { instanceOf: Error }, "Options string must start with a '-'");
+});
+
+test('common.parseOptions allows long options', t => {
+  const result = common.parseOptions({ value: true }, {
+    v: 'value',
+  });
+  t.truthy(result.value);
+});
+
+test('common.parseOptions allows long options with values', t => {
+  const someObject = {};
+  const result = common.parseOptions({ value: someObject }, {
+    v: 'value',
+  });
+  t.is(result.value, someObject);
+});
+
+test('common.parseOptions throws for unknown long option', t => {
+  t.throws(() => {
+    common.parseOptions({ throws: true }, {
+      v: 'value',
+    });
+  }, { instanceOf: common.CommandError });
+});
+
+test('common.parseOptions with -- argument', t => {
+  const result = common.parseOptions('--', {
+    R: 'recursive',
+    f: 'force',
+    r: 'reverse',
+  });
+
+  t.falsy(result.recursive);
+  t.falsy(result.force);
+  t.falsy(result.reverse);
+});
+
 test('Some basic tests on the ShellString type', t => {
   const result = shell.ShellString('foo');
   t.is(result.toString(), 'foo');
   t.is(result.stdout, 'foo');
-  t.is(typeof result.stderr, 'undefined');
+  t.is(result.stderr, undefined);
   t.truthy(result.to);
   t.truthy(result.toEnd);
 });
 
-test.cb('Commands that fail will still output error messages to stderr', t => {
-  const script = 'require(\'../global\'); ls(\'noexist\'); cd(\'noexist\');';
-  utils.runScript(script, (err, stdout, stderr) => {
-    t.is(stdout, '');
-    t.is(
-      stderr,
-      'ls: no such file or directory: noexist\ncd: no such file or directory: noexist\n'
-    );
-    t.end();
-  });
+test('Commands that fail will still output error messages to stderr', async t => {
+  const script = "require('./global'); ls('noexist'); cd('noexist');";
+  const result = await utils.runScript(script);
+  t.is(result.stdout, '');
+  t.is(
+    result.stderr,
+    'ls: no such file or directory: noexist\ncd: no such file or directory: noexist\n'
+  );
 });
 
 test('execPath value makes sense', t => {
   // TODO(nate): change this test if we add electron support in the unit tests
-  t.is(common.config.execPath, process.execPath);
-  t.is(typeof common.config.execPath, 'string');
+  t.is(shell.config.execPath, process.execPath);
+  t.is(typeof shell.config.execPath, 'string');
+});
+
+test('Changing shell.config.execPath does not modify process', t => {
+  shell.config.execPath = 'foo';
+  t.not(shell.config.execPath, process.execPath);
 });
 
-test('Changing common.config.execPath does not modify process', t => {
-  common.config.execPath = 'foo';
-  t.not(common.config.execPath, process.execPath);
+test('CommandError is a subclass of Error', t => {
+  const e = new common.CommandError(new common.ShellString('some value'));
+  t.truthy(e instanceof common.CommandError);
+  t.truthy(e instanceof Error);
+  t.is(e.constructor, common.CommandError);
 });
diff --git a/test/config.js b/test/config.js
index 83c45ffda..1e3a337ce 100644
--- a/test/config.js
+++ b/test/config.js
@@ -1,8 +1,10 @@
-import test from 'ava';
+const path = require('path');
 
-import shell from '..';
-import common from '../src/common';
-import utils from './utils/utils';
+const test = require('ava');
+
+const shell = require('..');
+const common = require('../src/common');
+const utils = require('./utils/utils');
 
 //
 // Valids
@@ -30,46 +32,295 @@ test('config.silent can be set to false', t => {
 // config.fatal
 //
 
-test.cb('config.fatal = false', t => {
+test('config.fatal = false', async t => {
   t.falsy(shell.config.fatal);
-  const script = 'require(\'../global.js\'); config.silent=true; config.fatal=false; cp("this_file_doesnt_exist", "."); echo("got here");';
-  utils.runScript(script, (err, stdout) => {
-    t.truthy(stdout.match('got here'));
-    t.end();
-  });
+  const script = `require('./global.js'); config.silent=true; config.fatal=false; cp("this_file_doesnt_exist", "."); echo("got here");`;
+  const result = await utils.runScript(script);
+  t.truthy(result.stdout.match('got here'));
+});
+
+test('config.fatal = true', async t => {
+  const script = `require('./global.js'); config.silent=true; config.fatal=true; cp("this_file_doesnt_exist", "."); echo("got here");`;
+  await t.throwsAsync(utils.runScript(script),
+    { message: /this_file_doesnt_exist/ });
 });
 
-test.cb('config.fatal = true', t => {
-  const script = 'require(\'../global.js\'); config.silent=true; config.fatal=true; cp("this_file_doesnt_exist", "."); echo("got here");';
-  utils.runScript(script, (err, stdout) => {
-    t.falsy(stdout.match('got here'));
-    t.end();
+test('config.fatal = false with an exec() failure returns, does not throw', t => {
+  const expected = { code: 2 };
+  t.notThrows(() => {
+    const result = shell.exec('exit 2');
+    t.is(result.code, expected.code);
   });
 });
 
+test('config.fatal = true with an exec() failure includes a .code on the Error', t => {
+  shell.config.fatal = true;
+  try {
+    t.throws(() => {
+      shell.exec('exit 2');
+    }, { code: 2 });
+  } finally {
+    shell.config.fatal = false;
+  }
+});
+
 //
 // config.globOptions
 //
 
-test('Expands to directories by default', t => {
+test('config.globOptions expands directories by default', t => {
+  const result = common.expand(['test/resources/*a*']);
+  const expected = [
+    'test/resources/a.txt',
+    'test/resources/badlink',
+    'test/resources/cat',
+    'test/resources/external',
+    'test/resources/head',
+  ];
+  t.deepEqual(result, expected);
+});
+
+test('config.globOptions handles non-wildcards by default', t => {
+  const result = common.expand(['test/resources/a.txt']);
+  const expected = [
+    'test/resources/a.txt',
+  ];
+  t.deepEqual(result, expected);
+});
+
+test('config.globOptions expands "?" symbol by default', t => {
+  const result = common.expand(['test/resources/file?.t*']);
+  const expected = [
+    'test/resources/file1.txt',
+    'test/resources/file2.txt',
+  ];
+  t.deepEqual(result, expected);
+});
+
+test('config.globOptions expands "*" in multiple path segments by default', t => {
+  const result = common.expand(['test/r*sources/file?.txt']);
+  const expected = [
+    'test/resources/file1.txt',
+    'test/resources/file2.txt',
+  ];
+  t.deepEqual(result, expected);
+});
+
+// https://github.com/shelljs/shelljs/issues/1197
+test('config.globOptions expands "?" in folder path by default', t => {
+  const result = common.expand(['test/r?sources/file*.txt']);
+  const expected = [
+    'test/resources/file1.txt',
+    'test/resources/file2.txt',
+  ];
+  t.deepEqual(result, expected);
+});
+
+test('config.globOptions respects cwd', t => {
+  // Both node-glob and fast-glob call this option 'cwd'.
+  shell.config.globOptions = { cwd: 'test' };
   const result = common.expand(['resources/*a*']);
-  t.is(result.length, 5);
-  t.truthy(result.indexOf('resources/a.txt') > -1);
-  t.truthy(result.indexOf('resources/badlink') > -1);
-  t.truthy(result.indexOf('resources/cat') > -1);
-  t.truthy(result.indexOf('resources/head') > -1);
-  t.truthy(result.indexOf('resources/external') > -1);
-});
-
-test(
-  'Check to make sure options get passed through (nodir is an example)',
-  t => {
-    shell.config.globOptions = { nodir: true };
-    const result = common.expand(['resources/*a*']);
-    t.is(result.length, 2);
-    t.truthy(result.indexOf('resources/a.txt') > -1);
-    t.truthy(result.indexOf('resources/badlink') > -1);
-    t.truthy(result.indexOf('resources/cat') < 0);
-    t.truthy(result.indexOf('resources/external') < 0);
+  const expected = [
+    'resources/a.txt',
+    'resources/badlink',
+    'resources/cat',
+    'resources/external',
+    'resources/head',
+  ];
+  t.deepEqual(result, expected);
+});
+
+test('config.globOptions respects dot', t => {
+  // Both node-glob and fast-glob call this option 'dot'.
+  shell.config.globOptions = { dot: true };
+  const result = common.expand(['test/resources/ls/*']);
+  t.is(result.length, 8);
+  t.truthy(result.includes('test/resources/ls/.hidden_dir'));
+  t.truthy(result.includes('test/resources/ls/.hidden_file'));
+});
+
+test('config.globOptions respects ignore', t => {
+  // Both node-glob and fast-glob call this option 'ignore'.
+  shell.config.globOptions = { ignore: ['test/resources/external'] };
+  const result = common.expand(['test/resources/*a*']);
+  const expected = [
+    'test/resources/a.txt',
+    'test/resources/badlink',
+    'test/resources/cat',
+    'test/resources/head',
+  ];
+  t.deepEqual(result, expected);
+  // Does not include the result that we chose to ignore
+  t.falsy(result.includes('test/resources/external'));
+});
+
+test('config.globOptions respects absolute', t => {
+  // Both node-glob and fast-glob call this option 'absolute'.
+  shell.config.globOptions = { absolute: true };
+  const result = common.expand(['test/resources/*a*']);
+  function abs(file) {
+    // Normalize to posix-style path separators on all platforms.
+    const CWD = process.platform === 'win32' ?
+        process.cwd().replace(/\\/g, '/') :
+        process.cwd();
+    return path.posix.join(CWD, file);
   }
-);
+  const expected = [
+    abs('test/resources/a.txt'),
+    abs('test/resources/badlink'),
+    abs('test/resources/cat'),
+    abs('test/resources/external'),
+    abs('test/resources/head'),
+  ];
+  t.deepEqual(result, expected);
+});
+
+test('config.globOptions respects nodir', t => {
+  shell.config.globOptions = { nodir: true };
+  const result = common.expand(['test/resources/*a*']);
+  // Includes files and symlinks.
+  const expected = [
+    'test/resources/a.txt',
+    'test/resources/badlink',
+  ];
+  t.deepEqual(result, expected);
+  // Does not include the directories.
+  t.falsy(result.includes('test/resources/cat'));
+  t.falsy(result.includes('test/resources/head'));
+  t.falsy(result.includes('test/resources/external'));
+});
+
+test('config.globOptions respects mark', t => {
+  shell.config.globOptions = { mark: true };
+  const result = common.expand(['test/resources/*a*']);
+  // Directories get a '/' character at the end.
+  const expected = [
+    'test/resources/a.txt',
+    'test/resources/badlink',
+    'test/resources/cat/',
+    'test/resources/external/',
+    'test/resources/head/',
+  ];
+  t.deepEqual(result, expected);
+});
+
+test('config.globOptions respects nobrace', t => {
+  // Default behavior is to expand "file{1..2}.txt" to ["file1.txt",
+  // "file2.txt"].
+  let result = common.expand(['test/resources/file{1..2}.txt']);
+  let expected = [
+    'test/resources/file1.txt',
+    'test/resources/file2.txt',
+  ];
+  t.deepEqual(result, expected);
+
+  // When 'nobrace' is true, brace expressions will expand as literals.
+  shell.config.globOptions = { nobrace: true };
+  result = common.expand(['test/resources/file{1..2}.txt']);
+  expected = [
+    'test/resources/file{1..2}.txt',
+  ];
+  t.deepEqual(result, expected);
+});
+
+test('config.globOptions respects noglobstar', t => {
+  // Default behavior is to expand "**" to match zero or more directories.
+  let result = common.expand(['test/**/file1']);
+  let expected = [
+    'test/resources/cat/file1',
+    'test/resources/chmod/file1',
+    'test/resources/cp/file1',
+    'test/resources/file1',
+    'test/resources/ls/file1',
+    'test/resources/sort/file1',
+    'test/resources/uniq/file1',
+  ];
+  t.deepEqual(result, expected);
+
+  // When 'noglobstar' is true, "**" will behave like a regular "*" and matches
+  // exactly 1 directory.
+  shell.config.globOptions = { noglobstar: true };
+  result = common.expand(['test/**/file1']);
+  expected = [
+    'test/resources/file1',
+  ];
+  t.deepEqual(result, expected);
+});
+
+test('config.globOptions respects noext', t => {
+  // Default behavior is to support fancy glob patterns (like "file1.+(js|txt)").
+  let result = common.expand([
+    'test/resources/file1.+(js|txt)',
+    'test/resources/file2.*',
+  ]);
+  let expected = [
+    'test/resources/file1.js',
+    'test/resources/file1.txt',
+    'test/resources/file2.js',
+    'test/resources/file2.txt',
+  ];
+  t.deepEqual(result, expected);
+
+  // When 'noext' is true, this only matches regular globs (like "file2.*").
+  shell.config.globOptions = { noext: true };
+  result = common.expand([
+    'test/resources/file1.+(js|txt)',
+    'test/resources/file2.*',
+  ]);
+  expected = [
+    'test/resources/file1.+(js|txt)',
+    'test/resources/file2.js',
+    'test/resources/file2.txt',
+  ];
+  t.deepEqual(result, expected);
+});
+
+test('config.globOptions respects nocase', t => {
+  // Default behavior will change depending on macOS, Windows, or Linux. This is
+  // difficult to test in a cross-platform way.
+
+  // When 'nocase' is true, we should be able to match files even if we use the
+  // wrong case in the pattern.
+  shell.config.globOptions = { nocase: true };
+  let result = common.expand(['test/resources/FILE*.TXT']);
+  let expected = [
+    'test/resources/file1.txt',
+    'test/resources/file2.txt',
+  ];
+  t.deepEqual(result, expected);
+
+  // When 'nocase' is false, using the wrong case will fail to match any files.
+  shell.config.globOptions = { nocase: false };
+  result = common.expand(['test/resources/FILE*.TXT']);
+  expected = [
+    'test/resources/FILE*.TXT',
+  ];
+  t.deepEqual(result, expected);
+});
+
+test('config.globOptions respects matchBase', t => {
+  // By default, "*" expressions only match inside of the same directory.
+  shell.config.globOptions = { cwd: 'test/resources' };
+  let result = common.expand(['*ile1']);
+  let expected = [
+    'file1',
+  ];
+  t.deepEqual(result, expected);
+
+  // When 'matchBase' is true (and the pattern contains no slashes), the
+  // pattern is implicitly treated like "**/*" and will expand to
+  // subdirectories.
+  shell.config.globOptions = { cwd: 'test/resources', matchBase: true };
+  result = common.expand(['*ile1']);
+  expected = [
+    'cat/file1',
+    'chmod/file1',
+    'cp/file1',
+    'file1',
+    'head/shortfile1',
+    'ls/file1',
+    'sort/file1',
+    'uniq/file1',
+  ];
+  t.deepEqual(result, expected);
+});
diff --git a/test/cp.js b/test/cp.js
index 4cb16e500..749884ccb 100644
--- a/test/cp.js
+++ b/test/cp.js
@@ -1,10 +1,10 @@
-import fs from 'fs';
+const fs = require('fs');
 
-import test from 'ava';
+const test = require('ava');
 
-import shell from '..';
-import common from '../src/common';
-import utils from './utils/utils';
+const shell = require('..');
+const common = require('../src/common');
+const utils = require('./utils/utils');
 
 const oldMaxDepth = shell.config.maxdepth;
 const CWD = process.cwd();
@@ -47,14 +47,14 @@ test('only an option', t => {
 });
 
 test('invalid option', t => {
-  const result = shell.cp('-@', 'resources/file1', `${t.context.tmp}/file1`);
+  const result = shell.cp('-@', 'test/resources/file1', `${t.context.tmp}/file1`);
   t.truthy(shell.error());
   t.is(result.code, 1);
   t.falsy(fs.existsSync(`${t.context.tmp}/file1`));
   t.is(result.stderr, 'cp: option not recognized: @');
 });
 
-test('invalid option', t => {
+test('invalid option #2', t => {
   const result = shell.cp('-Z', 'asdfasdf', `${t.context.tmp}/file2`);
   t.truthy(shell.error());
   t.is(result.code, 1);
@@ -71,7 +71,7 @@ test('source does not exist', t => {
   t.is(result.stderr, 'cp: no such file or directory: asdfasdf');
 });
 
-test('sources does not exist', t => {
+test('multiple sources do not exist', t => {
   const result = shell.cp('asdfasdf1', 'asdfasdf2', t.context.tmp);
   t.truthy(shell.error());
   t.is(result.code, 1);
@@ -85,58 +85,91 @@ test('sources does not exist', t => {
 });
 
 test('too many sources', t => {
-  const result = shell.cp('asdfasdf1', 'asdfasdf2', 'resources/file1');
+  const result = shell.cp('asdfasdf1', 'asdfasdf2', 'test/resources/file1');
   t.truthy(shell.error());
   t.is(result.code, 1);
   t.is(result.stderr, 'cp: dest is not a directory (too many sources)');
 });
 
 test('too many sources #2', t => {
-  const result = shell.cp('resources/file1', 'resources/file2', `${t.context.tmp}/a_file`);
+  const result = shell.cp('test/resources/file1', 'test/resources/file2', `${t.context.tmp}/a_file`);
   t.truthy(shell.error());
   t.is(result.code, 1);
   t.falsy(fs.existsSync(`${t.context.tmp}/a_file`));
   t.is(result.stderr, 'cp: dest is not a directory (too many sources)');
 });
 
+test('empty string source', t => {
+  const result = shell.cp('', 'dest');
+  t.truthy(shell.error());
+  t.is(result.code, 1);
+  t.is(result.stderr, "cp: no such file or directory: ''");
+});
+
 //
 // Valids
 //
 
 test('dest already exists', t => {
-  const oldContents = shell.cat('resources/file2').toString();
-  const result = shell.cp('-n', 'resources/file1', 'resources/file2');
+  const oldContents = shell.cat('test/resources/file2').toString();
+  const result = shell.cp('-n', 'test/resources/file1', 'test/resources/file2');
   t.falsy(shell.error());
   t.is(result.code, 0);
   t.is(result.stderr, '');
-  t.is(shell.cat('resources/file2').toString(), oldContents);
+  t.is(shell.cat('test/resources/file2').toString(), oldContents);
+});
+
+test('-nR does not overwrite an existing file at the destination', t => {
+  // Create tmp/new/cp/a
+  const dest = `${t.context.tmp}/new/cp`;
+  shell.mkdir('-p', dest);
+  const oldContents = 'original content';
+  shell.ShellString(oldContents).to(`${dest}/a`);
+
+  // Attempt to overwrite /tmp/new/cp/ with test/resources/cp/
+  const result = shell.cp('-nR', 'test/resources/cp/', `${t.context.tmp}/new/`);
+  t.falsy(shell.error());
+  t.is(result.code, 0);
+  t.falsy(result.stderr);
+  t.is(shell.cat(`${dest}/a`).toString(), oldContents);
+});
+
+test('-n does not overwrite an existing file if the destination is a directory', t => {
+  const oldContents = 'original content';
+  shell.cp('test/resources/file1', `${t.context.tmp}`);
+  new shell.ShellString(oldContents).to(`${t.context.tmp}/file1`);
+  const result = shell.cp('-n', 'test/resources/file1', `${t.context.tmp}`);
+  t.falsy(shell.error());
+  t.is(result.code, 0);
+  t.falsy(result.stderr);
+  t.is(shell.cat(`${t.context.tmp}/file1`).toString(), oldContents);
 });
 
 test('-f by default', t => {
-  shell.cp('resources/file2', 'resources/copyfile2');
-  const result = shell.cp('resources/file1', 'resources/file2'); // dest already exists
+  shell.cp('test/resources/file2', 'test/resources/copyfile2');
+  const result = shell.cp('test/resources/file1', 'test/resources/file2'); // dest already exists
   t.falsy(shell.error());
   t.is(result.code, 0);
   t.falsy(result.stderr);
-  t.is(shell.cat('resources/file1').toString(), shell.cat('resources/file2').toString()); // after cp
-  shell.mv('resources/copyfile2', 'resources/file2'); // restore
+  t.is(shell.cat('test/resources/file1').toString(), shell.cat('test/resources/file2').toString()); // after cp
+  shell.mv('test/resources/copyfile2', 'test/resources/file2'); // restore
   t.falsy(shell.error());
 });
 
 test('-f (explicitly)', t => {
-  shell.cp('resources/file2', 'resources/copyfile2');
-  const result = shell.cp('-f', 'resources/file1', 'resources/file2'); // dest already exists
+  shell.cp('test/resources/file2', 'test/resources/copyfile2');
+  const result = shell.cp('-f', 'test/resources/file1', 'test/resources/file2'); // dest already exists
   t.falsy(shell.error());
   t.falsy(result.stderr);
   t.is(result.code, 0);
-  t.is(shell.cat('resources/file1').toString(), shell.cat('resources/file2').toString()); // after cp
-  shell.mv('resources/copyfile2', 'resources/file2'); // restore
+  t.is(shell.cat('test/resources/file1').toString(), shell.cat('test/resources/file2').toString()); // after cp
+  shell.mv('test/resources/copyfile2', 'test/resources/file2'); // restore
   t.falsy(shell.error());
   t.is(result.code, 0);
 });
 
 test('simple - to dir', t => {
-  const result = shell.cp('resources/file1', t.context.tmp);
+  const result = shell.cp('test/resources/file1', t.context.tmp);
   t.falsy(shell.error());
   t.falsy(result.stderr);
   t.is(result.code, 0);
@@ -144,7 +177,7 @@ test('simple - to dir', t => {
 });
 
 test('simple - to file', t => {
-  const result = shell.cp('resources/file2', `${t.context.tmp}/file2`);
+  const result = shell.cp('test/resources/file2', `${t.context.tmp}/file2`);
   t.falsy(shell.error());
   t.falsy(result.stderr);
   t.is(result.code, 0);
@@ -152,7 +185,7 @@ test('simple - to file', t => {
 });
 
 test('simple - file list', t => {
-  const result = shell.cp('resources/file1', 'resources/file2', t.context.tmp);
+  const result = shell.cp('test/resources/file1', 'test/resources/file2', t.context.tmp);
   t.falsy(shell.error());
   t.falsy(result.stderr);
   t.is(result.code, 0);
@@ -161,7 +194,7 @@ test('simple - file list', t => {
 });
 
 test('simple - file list, array syntax', t => {
-  const result = shell.cp(['resources/file1', 'resources/file2'], t.context.tmp);
+  const result = shell.cp(['test/resources/file1', 'test/resources/file2'], t.context.tmp);
   t.falsy(shell.error());
   t.falsy(result.stderr);
   t.is(result.code, 0);
@@ -170,9 +203,9 @@ test('simple - file list, array syntax', t => {
 });
 
 test('-f option', t => {
-  shell.cp('resources/file2', `${t.context.tmp}/file3`);
+  shell.cp('test/resources/file2', `${t.context.tmp}/file3`);
   t.truthy(fs.existsSync(`${t.context.tmp}/file3`));
-  const result = shell.cp('-f', 'resources/file2', `${t.context.tmp}/file3`); // file exists, but -f specified
+  const result = shell.cp('-f', 'test/resources/file2', `${t.context.tmp}/file3`); // file exists, but -f specified
   t.falsy(shell.error());
   t.falsy(result.stderr);
   t.is(result.code, 0);
@@ -180,7 +213,7 @@ test('-f option', t => {
 });
 
 test('glob', t => {
-  const result = shell.cp('resources/file?', t.context.tmp);
+  const result = shell.cp('test/resources/file?', t.context.tmp);
   t.falsy(shell.error());
   t.falsy(result.stderr);
   t.is(result.code, 0);
@@ -194,7 +227,7 @@ test('glob', t => {
 
 test('wildcard', t => {
   shell.rm(`${t.context.tmp}/file1`, `${t.context.tmp}/file2`);
-  const result = shell.cp('resources/file*', t.context.tmp);
+  const result = shell.cp('test/resources/file*', t.context.tmp);
   t.falsy(shell.error());
   t.falsy(result.stderr);
   t.is(result.code, 0);
@@ -207,7 +240,7 @@ test('wildcard', t => {
 });
 
 test('recursive, with regular files', t => {
-  const result = shell.cp('-R', 'resources/file1', 'resources/file2', t.context.tmp);
+  const result = shell.cp('-R', 'test/resources/file1', 'test/resources/file2', t.context.tmp);
   t.falsy(shell.error());
   t.falsy(result.stderr);
   t.is(result.code, 0);
@@ -215,61 +248,64 @@ test('recursive, with regular files', t => {
   t.truthy(fs.existsSync(`${t.context.tmp}/file2`));
 });
 
+test('omit directory if missing recursive flag', t => {
+  const result = shell.cp('test/resources/cp', t.context.tmp);
+  t.is(shell.error(), "cp: omitting directory 'test/resources/cp'");
+  t.is(result.stderr, "cp: omitting directory 'test/resources/cp'");
+  t.is(result.code, 1);
+  t.falsy(fs.existsSync(`${t.context.tmp}/file1`));
+  t.falsy(fs.existsSync(`${t.context.tmp}/file2`));
+});
+
 test('recursive, nothing exists', t => {
-  const result = shell.cp('-R', 'resources/cp', t.context.tmp);
+  const result = shell.cp('-R', 'test/resources/cp', t.context.tmp);
   t.falsy(shell.error());
   t.falsy(result.stderr);
   t.is(result.code, 0);
-  t.is(shell.ls('-R', 'resources/cp').toString(), shell.ls('-R', `${t.context.tmp}/cp`).toString());
+  t.is(shell.ls('-R', 'test/resources/cp').toString(), shell.ls('-R', `${t.context.tmp}/cp`).toString());
 });
 
-test(
-  'recursive, nothing exists, source ends in \'/\' (see Github issue #15)',
-  t => {
-    const result = shell.cp('-R', 'resources/cp/', `${t.context.tmp}/`);
-    t.falsy(shell.error());
-    t.falsy(result.stderr);
-    t.is(result.code, 0);
-    t.is(shell.ls('-R', 'resources/cp').toString(), shell.ls('-R', `${t.context.tmp}/cp`).toString());
-  }
-);
+test('recursive, nothing exists, source ends in "/"', t => {
+  // Github issue #15
+  const result = shell.cp('-R', 'test/resources/cp/', `${t.context.tmp}/`);
+  t.falsy(shell.error());
+  t.falsy(result.stderr);
+  t.is(result.code, 0);
+  t.is(shell.ls('-R', 'test/resources/cp').toString(), shell.ls('-R', `${t.context.tmp}/cp`).toString());
+});
 
-test(
-  'recursive, globbing regular files with extension (see Github issue #376)',
-  t => {
-    const result = shell.cp('-R', 'resources/file*.txt', t.context.tmp);
-    t.falsy(shell.error());
-    t.falsy(result.stderr);
-    t.is(result.code, 0);
-    t.truthy(fs.existsSync(`${t.context.tmp}/file1.txt`));
-    t.truthy(fs.existsSync(`${t.context.tmp}/file2.txt`));
-  }
-);
+test('recursive, globbing regular files with extension', t => {
+  // Github issue #376
+  const result = shell.cp('-R', 'test/resources/file*.txt', t.context.tmp);
+  t.falsy(shell.error());
+  t.falsy(result.stderr);
+  t.is(result.code, 0);
+  t.truthy(fs.existsSync(`${t.context.tmp}/file1.txt`));
+  t.truthy(fs.existsSync(`${t.context.tmp}/file2.txt`));
+});
 
-test(
-  'recursive, copying one regular file (also related to Github issue #376)',
-  t => {
-    const result = shell.cp('-R', 'resources/file1.txt', t.context.tmp);
-    t.falsy(shell.error());
-    t.falsy(result.stderr);
-    t.is(result.code, 0);
-    t.truthy(fs.existsSync(`${t.context.tmp}/file1.txt`));
-    t.falsy(fs.statSync(`${t.context.tmp}/file1.txt`).isDirectory()); // don't let it be a dir
-  }
-);
+test('recursive, copying one regular file', t => {
+  // Github issue #376
+  const result = shell.cp('-R', 'test/resources/file1.txt', t.context.tmp);
+  t.falsy(shell.error());
+  t.falsy(result.stderr);
+  t.is(result.code, 0);
+  t.truthy(fs.existsSync(`${t.context.tmp}/file1.txt`));
+  t.falsy(common.statFollowLinks(`${t.context.tmp}/file1.txt`).isDirectory()); // don't let it be a dir
+});
 
 test('recursive, everything exists, no force flag', t => {
-  const result = shell.cp('-R', 'resources/cp', t.context.tmp);
+  const result = shell.cp('-R', 'test/resources/cp', t.context.tmp);
   t.falsy(shell.error()); // crash test only
   t.falsy(result.stderr);
   t.is(result.code, 0);
 });
 
 test('-R implies to not follow links', t => {
-  if (process.platform !== 'win32') {
-    shell.cp('-R', 'resources/cp/*', t.context.tmp);
-    t.truthy(fs.lstatSync(`${t.context.tmp}/links/sym.lnk`).isSymbolicLink()); // this one is a link
-    t.falsy((fs.lstatSync(`${t.context.tmp}/fakeLinks/sym.lnk`).isSymbolicLink())); // this one isn't
+  utils.skipOnWin(t, () => {
+    shell.cp('-R', 'test/resources/cp/*', t.context.tmp);
+    t.truthy(common.statNoFollowLinks(`${t.context.tmp}/links/sym.lnk`).isSymbolicLink()); // this one is a link
+    t.falsy((common.statNoFollowLinks(`${t.context.tmp}/fakeLinks/sym.lnk`).isSymbolicLink())); // this one isn't
     t.not(
       shell.cat(`${t.context.tmp}/links/sym.lnk`).toString(),
       shell.cat(`${t.context.tmp}/fakeLinks/sym.lnk`).toString()
@@ -278,22 +314,22 @@ test('-R implies to not follow links', t => {
     t.falsy(shell.error());
     t.falsy(result.stderr);
     t.is(result.code, 0);
-    t.truthy(fs.lstatSync(`${t.context.tmp}/links/sym.lnk`).isSymbolicLink()); // this one is a link
-    t.truthy(fs.lstatSync(`${t.context.tmp}/fakeLinks/sym.lnk`).isSymbolicLink()); // this one is now a link
+    t.truthy(common.statNoFollowLinks(`${t.context.tmp}/links/sym.lnk`).isSymbolicLink()); // this one is a link
+    t.truthy(common.statNoFollowLinks(`${t.context.tmp}/fakeLinks/sym.lnk`).isSymbolicLink()); // this one is now a link
     t.is(
       shell.cat(`${t.context.tmp}/links/sym.lnk`).toString(),
       shell.cat(`${t.context.tmp}/fakeLinks/sym.lnk`).toString()
     );
-  }
+  });
 });
 
 test('Missing -R implies -L', t => {
-  if (process.platform !== 'win32') {
+  utils.skipOnWin(t, () => {
     // Recursive, everything exists, overwrite a real file *by following a link*
     // Because missing the -R implies -L.
-    shell.cp('-R', 'resources/cp/*', t.context.tmp);
-    t.truthy(fs.lstatSync(`${t.context.tmp}/links/sym.lnk`).isSymbolicLink()); // this one is a link
-    t.falsy((fs.lstatSync(`${t.context.tmp}/fakeLinks/sym.lnk`).isSymbolicLink())); // this one isn't
+    shell.cp('-R', 'test/resources/cp/*', t.context.tmp);
+    t.truthy(common.statNoFollowLinks(`${t.context.tmp}/links/sym.lnk`).isSymbolicLink()); // this one is a link
+    t.falsy((common.statNoFollowLinks(`${t.context.tmp}/fakeLinks/sym.lnk`).isSymbolicLink())); // this one isn't
     t.not(
       shell.cat(`${t.context.tmp}/links/sym.lnk`).toString(),
       shell.cat(`${t.context.tmp}/fakeLinks/sym.lnk`).toString()
@@ -302,58 +338,54 @@ test('Missing -R implies -L', t => {
     t.falsy(shell.error());
     t.falsy(result.stderr);
     t.is(result.code, 0);
-    t.truthy(fs.lstatSync(`${t.context.tmp}/links/sym.lnk`).isSymbolicLink()); // this one is a link
-    t.falsy(fs.lstatSync(`${t.context.tmp}/fakeLinks/sym.lnk`).isSymbolicLink()); // this one is still not a link
+    t.truthy(common.statNoFollowLinks(`${t.context.tmp}/links/sym.lnk`).isSymbolicLink()); // this one is a link
+    t.falsy(common.statNoFollowLinks(`${t.context.tmp}/fakeLinks/sym.lnk`).isSymbolicLink()); // this one is still not a link
     // But it still follows the link
     t.is(
       shell.cat(`${t.context.tmp}/links/sym.lnk`).toString(),
       shell.cat(`${t.context.tmp}/fakeLinks/sym.lnk`).toString()
     );
-  }
+  });
 });
 
 test('recursive, everything exists, with force flag', t => {
-  let result = shell.cp('-R', 'resources/cp', t.context.tmp);
+  let result = shell.cp('-R', 'test/resources/cp', t.context.tmp);
   shell.ShellString('changing things around').to(`${t.context.tmp}/cp/dir_a/z`);
-  t.not(shell.cat('resources/cp/dir_a/z').toString(), shell.cat(`${t.context.tmp}/cp/dir_a/z`).toString()); // before cp
-  result = shell.cp('-Rf', 'resources/cp', t.context.tmp);
+  t.not(shell.cat('test/resources/cp/dir_a/z').toString(), shell.cat(`${t.context.tmp}/cp/dir_a/z`).toString()); // before cp
+  result = shell.cp('-Rf', 'test/resources/cp', t.context.tmp);
   t.falsy(shell.error());
   t.falsy(result.stderr);
   t.is(result.code, 0);
-  t.is(shell.cat('resources/cp/dir_a/z').toString(), shell.cat(`${t.context.tmp}/cp/dir_a/z`).toString()); // after cp
+  t.is(shell.cat('test/resources/cp/dir_a/z').toString(), shell.cat(`${t.context.tmp}/cp/dir_a/z`).toString()); // after cp
 });
 
-test(
-  'recursive, creates dest dir since it\'s only one level deep (see Github issue #44)',
-  t => {
-    const result = shell.cp('-r', 'resources/issue44', `${t.context.tmp}/dir2`);
-    t.falsy(shell.error());
-    t.falsy(result.stderr);
-    t.is(result.code, 0);
-    t.is(shell.ls('-R', 'resources/issue44').toString(), shell.ls('-R', `${t.context.tmp}/dir2`).toString());
-    t.is(
-      shell.cat('resources/issue44/main.js').toString(),
+test("recursive, creates dest dir since it's only one level deep", t => {
+  // Github issue #44
+  const result = shell.cp('-r', 'test/resources/issue44', `${t.context.tmp}/dir2`);
+  t.falsy(shell.error());
+  t.falsy(result.stderr);
+  t.is(result.code, 0);
+  t.is(shell.ls('-R', 'test/resources/issue44').toString(), shell.ls('-R', `${t.context.tmp}/dir2`).toString());
+  t.is(
+      shell.cat('test/resources/issue44/main.js').toString(),
       shell.cat(`${t.context.tmp}/dir2/main.js`).toString()
     );
-  }
-);
+});
 
-test(
-  'recursive, does *not* create dest dir since it\'s too deep (see Github issue #44)',
-  t => {
-    const result = shell.cp('-r', 'resources/issue44', `${t.context.tmp}/dir2/dir3`);
-    t.truthy(shell.error());
-    t.is(
-      result.stderr,
-      `cp: cannot create directory '${t.context.tmp}/dir2/dir3': No such file or directory`
-    );
-    t.is(result.code, 1);
-    t.falsy(fs.existsSync(`${t.context.tmp}/dir2`));
-  }
-);
+test("recursive, does *not* create dest dir since it's too deep", t => {
+  // Github issue #44
+  const result = shell.cp('-r', 'test/resources/issue44', `${t.context.tmp}/dir2/dir3`);
+  t.truthy(shell.error());
+  t.is(
+    result.stderr,
+    `cp: cannot create directory '${t.context.tmp}/dir2/dir3': No such file or directory`
+  );
+  t.is(result.code, 1);
+  t.falsy(fs.existsSync(`${t.context.tmp}/dir2`));
+});
 
 test('recursive, copies entire directory', t => {
-  const result = shell.cp('-r', 'resources/cp/dir_a', `${t.context.tmp}/dest`);
+  const result = shell.cp('-r', 'test/resources/cp/dir_a', `${t.context.tmp}/dest`);
   t.falsy(shell.error());
   t.falsy(result.stderr);
   t.is(result.code, 0);
@@ -361,31 +393,27 @@ test('recursive, copies entire directory', t => {
 });
 
 test('recursive, with trailing slash, does the exact same', t => {
-  const result = shell.cp('-r', 'resources/cp/dir_a/', `${t.context.tmp}/dest`);
+  const result = shell.cp('-r', 'test/resources/cp/dir_a/', `${t.context.tmp}/dest`);
   t.is(result.code, 0);
   t.falsy(shell.error());
   t.truthy(fs.existsSync(`${t.context.tmp}/dest/z`));
 });
 
-test(
-  'On Windows, permission bits are quite different so skip those tests for now',
-  t => {
-    if (common.platform !== 'win') {
-      // preserve mode bits
-      const execBit = parseInt('001', 8);
-      t.is(fs.statSync('resources/cp-mode-bits/executable').mode & execBit, execBit);
-      shell.cp('resources/cp-mode-bits/executable', `${t.context.tmp}/executable`);
-      t.is(
-        fs.statSync('resources/cp-mode-bits/executable').mode,
-        fs.statSync(`${t.context.tmp}/executable`).mode
-      );
-    }
-  }
-);
+test('preserve mode bits by default for file', t => {
+  utils.skipOnWin(t, () => {
+    const execBit = parseInt('001', 8);
+    t.is(common.statFollowLinks('test/resources/cp-mode-bits/executable').mode & execBit, execBit);
+    shell.cp('test/resources/cp-mode-bits/executable', `${t.context.tmp}/executable`);
+    t.is(
+      common.statFollowLinks('test/resources/cp-mode-bits/executable').mode,
+      common.statFollowLinks(`${t.context.tmp}/executable`).mode
+    );
+  });
+});
 
 test('Make sure hidden files are copied recursively', t => {
   shell.rm('-rf', t.context.tmp);
-  const result = shell.cp('-r', 'resources/ls/', t.context.tmp);
+  const result = shell.cp('-r', 'test/resources/ls/', t.context.tmp);
   t.falsy(shell.error());
   t.falsy(result.stderr);
   t.is(result.code, 0);
@@ -393,17 +421,10 @@ test('Make sure hidden files are copied recursively', t => {
 });
 
 test('no-recursive will copy regular files only', t => {
-  const result = shell.cp('resources/file1.txt', 'resources/ls/', t.context.tmp);
-  t.is(result.code, 1);
-  t.truthy(shell.error());
-  t.falsy(fs.existsSync(`${t.context.tmp}/.hidden_file`)); // doesn't copy dir contents
-  t.falsy(fs.existsSync(`${t.context.tmp}/ls`)); // doesn't copy dir itself
-  t.truthy(fs.existsSync(`${t.context.tmp}/file1.txt`));
-});
-
-test('no-recursive will copy regular files only', t => {
-  const result = shell.cp('resources/file1.txt', 'resources/file2.txt', 'resources/cp',
-    'resources/ls/', t.context.tmp);
+  const result = shell.cp(
+    'test/resources/file1.txt', 'test/resources/file2.txt', 'test/resources/cp',
+    'test/resources/ls/', t.context.tmp
+  );
 
   t.is(result.code, 1);
   t.truthy(shell.error());
@@ -416,63 +437,109 @@ test('no-recursive will copy regular files only', t => {
 });
 
 test('-R implies -P', t => {
-  if (process.platform !== 'win32') {
-    shell.cp('-R', 'resources/cp/links/sym.lnk', t.context.tmp);
-    t.truthy(fs.lstatSync(`${t.context.tmp}/sym.lnk`).isSymbolicLink());
-  }
+  utils.skipOnWin(t, () => {
+    shell.cp('-R', 'test/resources/cp/links/sym.lnk', t.context.tmp);
+    t.truthy(common.statNoFollowLinks(`${t.context.tmp}/sym.lnk`).isSymbolicLink());
+  });
+});
+
+test("-Ru respects the -u flag recursively (don't update newer file)", t => {
+  // Setup code
+  const dir = `${t.context.tmp}/cp-Ru`;
+  const sourceDir = `${dir}/original`;
+  const sourceFile = `${sourceDir}/file`;
+  const destDir = `${dir}/new`;
+  const nestedDestDir = `${dir}/new/original`;
+  const destFile = `${nestedDestDir}/file`;
+  [sourceDir, destDir, nestedDestDir].forEach(d => shell.mkdir('-p', d));
+  shell.ShellString('Source File Contents\n').to(sourceFile);
+  shell.ShellString('Destination File Contents\n').to(destFile);
+  const oldModifyTimeMs = 12345000;
+  const newModifyTimeMs = 67890000;
+  // End setup
+
+  // Set the source file to be OLDER than the destination file
+  shell.touch({ '-m': true, '-d': new Date(oldModifyTimeMs) }, sourceFile);
+  shell.touch({ '-m': true, '-d': new Date(newModifyTimeMs) }, destFile);
+  shell.cp('-Ru', sourceDir, destDir);
+  // Check that dest has not been updated
+  t.is(shell.cat(destFile).stdout, 'Destination File Contents\n');
+});
+
+test('-Ru respects the -u flag recursively (update older file)', t => {
+  // Setup code
+  const dir = `${t.context.tmp}/cp-Ru`;
+  const sourceDir = `${dir}/original`;
+  const sourceFile = `${sourceDir}/file`;
+  const destDir = `${dir}/new`;
+  const nestedDestDir = `${dir}/new/original`;
+  const destFile = `${nestedDestDir}/file`;
+  [sourceDir, destDir, nestedDestDir].forEach(d => shell.mkdir('-p', d));
+  shell.ShellString('Source File Contents\n').to(sourceFile);
+  shell.ShellString('Destination File Contents\n').to(destFile);
+  const oldModifyTimeMs = 12345000;
+  const newModifyTimeMs = 67890000;
+  // End setup
+
+  // Set the source file to be NEWER than the destination file
+  shell.touch({ '-m': true, '-d': new Date(newModifyTimeMs) }, sourceFile);
+  shell.touch({ '-m': true, '-d': new Date(oldModifyTimeMs) }, destFile);
+  shell.cp('-Ru', sourceDir, destDir);
+  // Check that dest has been overwritten
+  t.is(shell.cat(destFile).stdout, 'Source File Contents\n');
 });
 
 test('using -P explicitly works', t => {
-  if (process.platform !== 'win32') {
-    shell.cp('-P', 'resources/cp/links/sym.lnk', t.context.tmp);
-    t.truthy(fs.lstatSync(`${t.context.tmp}/sym.lnk`).isSymbolicLink());
-  }
+  utils.skipOnWin(t, () => {
+    shell.cp('-P', 'test/resources/cp/links/sym.lnk', t.context.tmp);
+    t.truthy(common.statNoFollowLinks(`${t.context.tmp}/sym.lnk`).isSymbolicLink());
+  });
 });
 
 test('using -PR on a link to a folder does not follow the link', t => {
-  if (process.platform !== 'win32') {
-    shell.cp('-PR', 'resources/cp/symFolder', t.context.tmp);
-    t.truthy(fs.lstatSync(`${t.context.tmp}/symFolder`).isSymbolicLink());
-  }
+  utils.skipOnWin(t, () => {
+    shell.cp('-PR', 'test/resources/cp/symFolder', t.context.tmp);
+    t.truthy(common.statNoFollowLinks(`${t.context.tmp}/symFolder`).isSymbolicLink());
+  });
 });
 
 test('-L overrides -P for copying directory', t => {
-  if (process.platform !== 'win32') {
-    shell.cp('-LPR', 'resources/cp/symFolder', t.context.tmp);
-    t.falsy(fs.lstatSync(`${t.context.tmp}/symFolder`).isSymbolicLink());
-    t.falsy(fs.lstatSync(`${t.context.tmp}/symFolder/sym.lnk`).isSymbolicLink());
-  }
+  utils.skipOnWin(t, () => {
+    shell.cp('-LPR', 'test/resources/cp/symFolder', t.context.tmp);
+    t.falsy(common.statNoFollowLinks(`${t.context.tmp}/symFolder`).isSymbolicLink());
+    t.falsy(common.statNoFollowLinks(`${t.context.tmp}/symFolder/sym.lnk`).isSymbolicLink());
+  });
 });
 
 test('Recursive, copies entire directory with no symlinks and -L option does not cause change in behavior', t => {
-  if (process.platform !== 'win32') {
-    const result = shell.cp('-rL', 'resources/cp/dir_a', `${t.context.tmp}/dest`);
+  utils.skipOnWin(t, () => {
+    const result = shell.cp('-rL', 'test/resources/cp/dir_a', `${t.context.tmp}/dest`);
     t.falsy(shell.error());
     t.falsy(result.stderr);
     t.is(result.code, 0);
     t.truthy(fs.existsSync(`${t.context.tmp}/dest/z`));
-  }
+  });
 });
 
-test('-u flag won\'t overwrite newer files', t => {
+test("-u flag won't overwrite newer files", t => {
   shell.touch(`${t.context.tmp}/file1.js`);
-  shell.cp('-u', 'resources/file1.js', t.context.tmp);
+  shell.cp('-u', 'test/resources/file1.js', t.context.tmp);
   t.falsy(shell.error());
-  t.not(shell.cat('resources/file1.js').toString(), shell.cat(`${t.context.tmp}/file1.js`).toString());
+  t.not(shell.cat('test/resources/file1.js').toString(), shell.cat(`${t.context.tmp}/file1.js`).toString());
 });
 
 test('-u flag does overwrite older files', t => {
   shell.touch({ '-d': new Date(10) }, `${t.context.tmp}/file1.js`); // really old file
-  shell.cp('-u', 'resources/file1.js', t.context.tmp);
+  shell.cp('-u', 'test/resources/file1.js', t.context.tmp);
   t.falsy(shell.error());
-  t.is(shell.cat('resources/file1.js').toString(), shell.cat(`${t.context.tmp}/file1.js`).toString());
+  t.is(shell.cat('test/resources/file1.js').toString(), shell.cat(`${t.context.tmp}/file1.js`).toString());
 });
 
-test('-u flag works even if it\'s not overwriting a file', t => {
+test("-u flag works even if it's not overwriting a file", t => {
   t.falsy(fs.existsSync(`${t.context.tmp}/file1.js`));
-  shell.cp('-u', 'resources/file1.js', t.context.tmp);
+  shell.cp('-u', 'test/resources/file1.js', t.context.tmp);
   t.falsy(shell.error());
-  t.is(shell.cat('resources/file1.js').toString(), shell.cat(`${t.context.tmp}/file1.js`).toString());
+  t.is(shell.cat('test/resources/file1.js').toString(), shell.cat(`${t.context.tmp}/file1.js`).toString());
 });
 
 test('-u flag works correctly recursively', t => {
@@ -495,35 +562,35 @@ test('-u flag works correctly recursively', t => {
 });
 
 test('using -R on a link to a folder *does* follow the link', t => {
-  shell.cp('-R', 'resources/cp/symFolder', t.context.tmp);
-  t.falsy(fs.lstatSync(`${t.context.tmp}/symFolder`).isSymbolicLink());
+  shell.cp('-R', 'test/resources/cp/symFolder', t.context.tmp);
+  t.falsy(common.statNoFollowLinks(`${t.context.tmp}/symFolder`).isSymbolicLink());
 });
 
 test('Without -R, -L is implied', t => {
-  shell.cp('resources/cp/links/sym.lnk', t.context.tmp);
-  t.falsy(fs.lstatSync(`${t.context.tmp}/sym.lnk`).isSymbolicLink());
+  shell.cp('test/resources/cp/links/sym.lnk', t.context.tmp);
+  t.falsy(common.statNoFollowLinks(`${t.context.tmp}/sym.lnk`).isSymbolicLink());
 });
 
 test('-L explicitly works', t => {
-  shell.cp('-L', 'resources/cp/links/sym.lnk', t.context.tmp);
-  t.falsy(fs.lstatSync(`${t.context.tmp}/sym.lnk`).isSymbolicLink());
+  shell.cp('-L', 'test/resources/cp/links/sym.lnk', t.context.tmp);
+  t.falsy(common.statNoFollowLinks(`${t.context.tmp}/sym.lnk`).isSymbolicLink());
 });
 
 test('using -LR does not imply -P', t => {
-  shell.cp('-LR', 'resources/cp/links/sym.lnk', t.context.tmp);
-  t.falsy(fs.lstatSync(`${t.context.tmp}/sym.lnk`).isSymbolicLink());
+  shell.cp('-LR', 'test/resources/cp/links/sym.lnk', t.context.tmp);
+  t.falsy(common.statNoFollowLinks(`${t.context.tmp}/sym.lnk`).isSymbolicLink());
 });
 
 test('using -LR also works recursively on directories containing links', t => {
-  shell.cp('-LR', 'resources/cp/links', t.context.tmp);
-  t.falsy(fs.lstatSync(`${t.context.tmp}/links/sym.lnk`).isSymbolicLink());
+  shell.cp('-LR', 'test/resources/cp/links', t.context.tmp);
+  t.falsy(common.statNoFollowLinks(`${t.context.tmp}/links/sym.lnk`).isSymbolicLink());
 });
 
 test('-L always overrides a -P', t => {
-  shell.cp('-LP', 'resources/cp/links/sym.lnk', t.context.tmp);
-  t.falsy(fs.lstatSync(`${t.context.tmp}/sym.lnk`).isSymbolicLink());
-  shell.cp('-LPR', 'resources/cp/links/sym.lnk', t.context.tmp);
-  t.falsy(fs.lstatSync(`${t.context.tmp}/sym.lnk`).isSymbolicLink());
+  shell.cp('-LP', 'test/resources/cp/links/sym.lnk', t.context.tmp);
+  t.falsy(common.statNoFollowLinks(`${t.context.tmp}/sym.lnk`).isSymbolicLink());
+  shell.cp('-LPR', 'test/resources/cp/links/sym.lnk', t.context.tmp);
+  t.falsy(common.statNoFollowLinks(`${t.context.tmp}/sym.lnk`).isSymbolicLink());
 });
 
 test('Make sure max depth does not limit shallow directory structures', t => {
@@ -582,7 +649,7 @@ test('cp -L follows symlinks', t => {
   utils.skipOnWinForEPERM(shell.ln.bind(shell, '-s', `${t.context.tmp}/0`, `${t.context.tmp}/symlinktest`), () => {
     shell.mkdir('-p', `${t.context.tmp}/sub`);
     shell.mkdir('-p', `${t.context.tmp}/new`);
-    shell.cp('-f', 'resources/file1.txt', `${t.context.tmp}/sub/file.txt`);
+    shell.cp('-f', 'test/resources/file1.txt', `${t.context.tmp}/sub/file.txt`);
     shell.cd(`${t.context.tmp}/sub`);
     shell.ln('-s', 'file.txt', 'foo.lnk');
     shell.ln('-s', 'file.txt', 'sym.lnk');
@@ -590,7 +657,7 @@ test('cp -L follows symlinks', t => {
     shell.cp('-L', 'sub/*', 'new/');
     shell.cd('new');
 
-    shell.cp('-f', '../../resources/file2.txt', 'file.txt');
+    shell.cp('-f', '../../test/resources/file2.txt', 'file.txt');
     t.is(shell.cat('file.txt').toString(), 'test2\n');
     // Ensure other files have not changed.
     t.is(shell.cat('foo.lnk').toString(), 'test1\n');
@@ -604,8 +671,8 @@ test('cp -L follows symlinks', t => {
 test('Test with recursive option and symlinks.', t => {
   utils.skipOnWinForEPERM(shell.ln.bind(shell, '-s', `${t.context.tmp}/0`, `${t.context.tmp}/symlinktest`), () => {
     shell.mkdir('-p', `${t.context.tmp}/sub/sub1`);
-    shell.cp('-f', 'resources/file1.txt', `${t.context.tmp}/sub/file.txt`);
-    shell.cp('-f', 'resources/file1.txt', `${t.context.tmp}/sub/sub1/file.txt`);
+    shell.cp('-f', 'test/resources/file1.txt', `${t.context.tmp}/sub/file.txt`);
+    shell.cp('-f', 'test/resources/file1.txt', `${t.context.tmp}/sub/sub1/file.txt`);
     shell.cd(`${t.context.tmp}/sub`);
     shell.ln('-s', 'file.txt', 'foo.lnk');
     shell.ln('-s', 'file.txt', 'sym.lnk');
@@ -624,7 +691,7 @@ test('Test with recursive option and symlinks.', t => {
     shell.cd('new');
 
     // Ensure copies of files are symlinks by updating file contents.
-    shell.cp('-f', '../../resources/file2.txt', 'file.txt');
+    shell.cp('-f', '../../test/resources/file2.txt', 'file.txt');
     t.is(shell.cat('file.txt').toString(), 'test2\n');
     // Ensure other files have not changed.
     t.is(shell.cat('foo.lnk').toString(), 'test1\n');
@@ -636,7 +703,7 @@ test('Test with recursive option and symlinks.', t => {
 
     // Ensure other files have not changed.
     shell.cd('sub1');
-    shell.cp('-f', '../../../resources/file2.txt', 'file.txt');
+    shell.cp('-f', '../../../test/resources/file2.txt', 'file.txt');
     t.is(shell.cat('file.txt').toString(), 'test2\n');
     t.is(shell.cat('foo.lnk').toString(), 'test1\n');
     t.is(shell.cat('sym.lnk').toString(), 'test1\n');
@@ -648,8 +715,281 @@ test('Test with recursive option and symlinks.', t => {
 });
 
 test('recursive, with a non-normalized path', t => {
-  const result = shell.cp('-R', 'resources/../resources/./cp', t.context.tmp);
+  const result = shell.cp('-R', 'test/resources/../resources/./cp', t.context.tmp);
   t.falsy(shell.error()); // crash test only
   t.falsy(result.stderr);
   t.is(result.code, 0);
 });
+
+test('copy file to same path', t => {
+  const result = shell.cp('test/resources/file1', 'test/resources/file1');
+  t.truthy(shell.error());
+  t.is(result.code, 1);
+  t.is(result.stderr, "cp: 'test/resources/file1' and 'test/resources/file1' are the same file");
+});
+
+test('copy file to same directory', t => {
+  const result = shell.cp('test/resources/file1', 'test/resources');
+  t.truthy(shell.error());
+  t.is(result.code, 1);
+  t.is(result.stderr, "cp: 'test/resources/file1' and 'test/resources/file1' are the same file");
+});
+
+test('copy multiple files to same location', t => {
+  const result = shell.cp('test/resources/file1', 'test/resources/file2', 'test/resources');
+  t.truthy(shell.error());
+  t.is(result.code, 1);
+  t.is(
+    result.stderr,
+    "cp: 'test/resources/file1' and 'test/resources/file1' are the same file\n" +
+    "cp: 'test/resources/file2' and 'test/resources/file2' are the same file"
+  );
+});
+
+test('should not overwrite recently created files', t => {
+  const result = shell.cp('test/resources/file1', 'test/resources/cp/file1', t.context.tmp);
+  t.truthy(shell.error());
+  t.is(result.code, 1);
+
+  // Ensure First file is copied
+  t.is(shell.cat(`${t.context.tmp}/file1`).toString(), 'test1');
+  t.is(
+    result.stderr,
+    `cp: will not overwrite just-created '${t.context.tmp}/file1' with 'test/resources/cp/file1'`
+  );
+});
+
+
+test('should not overwrite recently created files (in recursive Mode)', t => {
+  const result = shell.cp('-R', 'test/resources/file1', 'test/resources/cp/file1', t.context.tmp);
+  t.truthy(shell.error());
+  t.is(result.code, 1);
+
+  // Ensure First file is copied
+  t.is(shell.cat(`${t.context.tmp}/file1`).toString(), 'test1');
+  t.is(
+    result.stderr,
+    `cp: will not overwrite just-created '${t.context.tmp}/file1' with 'test/resources/cp/file1'`
+  );
+});
+
+test('should not overwrite recently created files (not give error no-force mode)', t => {
+  const result = shell.cp('-n', 'test/resources/file1', 'test/resources/cp/file1', t.context.tmp);
+  t.falsy(shell.error());
+  t.is(result.code, 0);
+
+  // Ensure First file is copied
+  t.is(shell.cat(`${t.context.tmp}/file1`).toString(), 'test1');
+});
+
+// cp -R should be able to copy a readonly src (issue #98).
+// On Windows, chmod acts VERY differently so skip these tests for now
+test('cp -R should be able to copy a readonly src. issue #98; (Non window platforms only)', t => {
+  utils.skipOnWin(t, () => {
+    shell.cp('-r', 'test/resources/cp', t.context.tmp);
+    shell.chmod('555', `${t.context.tmp}/cp/`);
+    shell.chmod('555', `${t.context.tmp}/cp/dir_a`);
+    shell.chmod('555', `${t.context.tmp}/cp/dir_b`);
+    shell.chmod('555', `${t.context.tmp}/cp/a`);
+
+    const result = shell.cp('-r', `${t.context.tmp}/cp`, `${t.context.tmp}/cp_cp`);
+    t.falsy(shell.error());
+    t.falsy(result.stderr);
+    t.is(result.code, 0);
+
+    t.is(shell.ls('-R', `${t.context.tmp}/cp`) + '', shell.ls('-R', `${t.context.tmp}/cp_cp`) + '');
+    t.is(fs.statSync(`${t.context.tmp}/cp_cp`).mode & parseInt('777', 8), parseInt('555', 8));
+    t.is(fs.statSync(`${t.context.tmp}/cp_cp/dir_a`).mode & parseInt('777', 8), parseInt('555', 8));
+    t.is(fs.statSync(`${t.context.tmp}/cp_cp/a`).mode & parseInt('777', 8), parseInt('555', 8));
+
+    shell.chmod('-R', '755', t.context.tmp);
+  });
+});
+
+test('cp -p should preserve mode, ownership, and timestamp (regular file)', t => {
+  // Setup: copy to srcFile and modify mode and timestamp
+  const srcFile = `${t.context.tmp}/srcFile`;
+  shell.cp('test/resources/cp/file1', srcFile);
+  // Make this a round number of seconds, since the underlying system may not
+  // have millisecond precision.
+  const newModifyTimeMs = 12345000;
+  const newAccessTimeMs = 67890000;
+  shell.touch({ '-d': new Date(newModifyTimeMs), '-m': true }, srcFile);
+  shell.touch({ '-d': new Date(newAccessTimeMs), '-a': true }, srcFile);
+  const mode = '444';
+  shell.chmod(mode, srcFile);
+
+  // Now re-copy with '-p' and verify metadata.
+  const result = shell.cp('-p', srcFile, `${t.context.tmp}/preservedFile1`);
+  const stat = common.statFollowLinks(srcFile);
+  const statOfResult = common.statFollowLinks(`${t.context.tmp}/preservedFile1`);
+
+  t.is(result.code, 0);
+
+  // Original file should be unchanged:
+  t.is(stat.mtime.getTime(), newModifyTimeMs);
+  // cp appears to update the atime, but only of the srcFile
+  t.is(stat.mode.toString(8), '100' + mode);
+
+  // New file should keep same attributes
+  t.is(statOfResult.mtime.getTime(), newModifyTimeMs);
+  t.is(statOfResult.atime.getTime(), newAccessTimeMs);
+  t.is(statOfResult.mode.toString(8), '100' + mode);
+
+  t.is(stat.uid, statOfResult.uid);
+  t.is(stat.gid, statOfResult.gid);
+});
+
+test('cp -p should preserve mode, ownership, and timestamp (directory)', t => {
+  // Setup: copy to srcFile and modify mode and timestamp
+  const srcDir = `${t.context.tmp}/srcDir`;
+  const srcFile = `${srcDir}/srcFile`;
+  shell.mkdir(srcDir);
+  shell.cp('test/resources/cp/file1', srcFile);
+  // Make this a round number of seconds, since the underlying system may not
+  // have millisecond precision.
+  const newModifyTimeMs = 12345000;
+  const newAccessTimeMs = 67890000;
+  shell.touch({ '-d': new Date(newModifyTimeMs), '-m': true }, srcFile);
+  shell.touch({ '-d': new Date(newAccessTimeMs), '-a': true }, srcFile);
+  fs.utimesSync(srcDir, new Date(newAccessTimeMs), new Date(newModifyTimeMs));
+  const mode = '444';
+  shell.chmod(mode, srcFile);
+
+  // Now re-copy (the whole dir) with '-p' and verify metadata of file contents.
+  const result = shell.cp('-pr', srcDir, `${t.context.tmp}/preservedDir`);
+  const stat = common.statFollowLinks(srcFile);
+  const statDir = common.statFollowLinks(srcDir);
+  const statOfResult = common.statFollowLinks(`${t.context.tmp}/preservedDir/srcFile`);
+  const statOfResultDir = common.statFollowLinks(`${t.context.tmp}/preservedDir`);
+
+  t.is(result.code, 0);
+
+  // Both original file and original dir should be unchanged:
+  t.is(statDir.mtime.getTime(), newModifyTimeMs);
+  t.is(stat.mtime.getTime(), newModifyTimeMs);
+  // cp appears to update the atime, but only of the srcFile & srcDir
+  t.is(stat.mode.toString(8), '100' + mode);
+
+  // Both new file and new dir should keep same attributes
+  t.is(statOfResultDir.mtime.getTime(), newModifyTimeMs);
+  utils.skipOnWin(t, () => {
+    // The resultDir atime may be updated on Windows as a side-effect, e.g. chmod().
+    t.is(statOfResultDir.atime.getTime(), newAccessTimeMs);
+  });
+  t.is(statOfResult.mtime.getTime(), newModifyTimeMs);
+  t.is(statOfResult.atime.getTime(), newAccessTimeMs);
+  t.is(statOfResult.mode.toString(8), '100' + mode);
+
+  t.is(stat.uid, statOfResult.uid);
+  t.is(stat.gid, statOfResult.gid);
+});
+
+test('cp -p should preserve mode, ownership, and timestamp (symlink)', t => {
+  // Skip in Windows because symlinks require elevated permissions.
+  utils.skipOnWin(t, () => {
+    // Setup: copy to srcFile, create srcLink, and modify mode and timestamp
+    shell.cp('test/resources/cp/file1', `${t.context.tmp}/srcFile`);
+    const srcLink = `${t.context.tmp}/srcLink`;
+    shell.ln('-s', 'srcFile', `${t.context.tmp}/srcLink`);
+    // Make this a round number of seconds, since the underlying system may not
+    // have millisecond precision.
+    const newModifyTimeMs = 12345000;
+    const newAccessTimeMs = 67890000;
+    shell.touch({ '-d': new Date(newModifyTimeMs), '-m': true }, srcLink);
+    shell.touch({ '-d': new Date(newAccessTimeMs), '-a': true }, srcLink);
+    const mode = '444';
+    shell.chmod(mode, srcLink);
+
+    // Now re-copy with '-p' and verify metadata.
+    const result = shell.cp('-p', srcLink, `${t.context.tmp}/preservedLink`);
+    const stat = common.statFollowLinks(srcLink);
+    const statOfResult = common.statFollowLinks(`${t.context.tmp}/preservedLink`);
+
+    t.is(result.code, 0);
+
+    // Original file should be unchanged:
+    t.is(stat.mtime.getTime(), newModifyTimeMs);
+    // cp appears to update the atime, but only of the srcFile
+    t.is(stat.mode.toString(8), '100' + mode);
+
+    // New file should keep same attributes
+    t.is(statOfResult.mtime.getTime(), newModifyTimeMs);
+    t.is(statOfResult.atime.getTime(), newAccessTimeMs);
+    t.is(statOfResult.mode.toString(8), '100' + mode);
+
+    t.is(stat.uid, statOfResult.uid);
+    t.is(stat.gid, statOfResult.gid);
+  });
+});
+
+test('copy directory to its parent dir (same location) should not erase content', t => {
+  // Setup: create a directory with a file inside t.context.tmp
+  shell.mkdir(`${t.context.tmp}/srcdir`);
+  shell.ShellString('deadbeef').to(`${t.context.tmp}/srcdir/lol`);
+
+  // Verify setup
+  t.is(shell.cat(`${t.context.tmp}/srcdir/lol`).toString(), 'deadbeef');
+
+  // This should error, not silently erase the file contents
+  const result = shell.cp('-R', `${t.context.tmp}/srcdir`, t.context.tmp);
+  t.truthy(shell.error());
+  t.is(result.code, 1);
+  t.truthy(result.stderr.match(/are the same file/));
+
+  // Most importantly: file content must be preserved (no data loss)
+  t.is(shell.cat(`${t.context.tmp}/srcdir/lol`).toString(), 'deadbeef');
+});
+
+test('copy directory to same location with trailing slash should not erase content', t => {
+  // Setup: create a directory with a file inside t.context.tmp
+  shell.mkdir(`${t.context.tmp}/srcdir`);
+  shell.ShellString('deadbeef').to(`${t.context.tmp}/srcdir/lol`);
+
+  // Verify setup
+  t.is(shell.cat(`${t.context.tmp}/srcdir/lol`).toString(), 'deadbeef');
+
+  // cp -R /path/srcdir /path/ should detect same directory
+  const result = shell.cp('-R', `${t.context.tmp}/srcdir`, `${t.context.tmp}/`);
+  t.truthy(shell.error());
+  t.is(result.code, 1);
+  t.truthy(result.stderr.match(/are the same file/));
+
+  // File content must be preserved
+  t.is(shell.cat(`${t.context.tmp}/srcdir/lol`).toString(), 'deadbeef');
+});
+
+test('copy multiple dirs where one is to same location should error for that one and continue', t => {
+  // Setup: src1 in tmp root, src2 inside destination
+  shell.mkdir(`${t.context.tmp}/src1`);
+  shell.mkdir('-p', `${t.context.tmp}/destination/src2`);
+  shell.ShellString('content1').to(`${t.context.tmp}/src1/file`);
+  shell.ShellString('content2').to(`${t.context.tmp}/destination/src2/file`);
+
+  // src1 copy should succeed, src2 copy should fail (but the original src2 is still intact)
+  const result = shell.cp('-R', `${t.context.tmp}/src1`, `${t.context.tmp}/destination/src2`, `${t.context.tmp}/destination`);
+  t.truthy(shell.error());
+  t.is(result.code, 1);
+
+  // src1 was copied successfully into destination
+  t.is(shell.cat(`${t.context.tmp}/destination/src1/file`).toString(), 'content1');
+  // src2's original content is preserved (not lost due to same-file copy)
+  t.is(shell.cat(`${t.context.tmp}/destination/src2/file`).toString(), 'content2');
+});
+
+test('copy single file to itself should not erase content', t => {
+  // Setup: create a file in t.context.tmp
+  shell.ShellString('important data').to(`${t.context.tmp}/myfile.txt`);
+
+  // Verify setup
+  t.is(shell.cat(`${t.context.tmp}/myfile.txt`).toString(), 'important data');
+
+  // Copying a file to itself should error but preserve data
+  const result = shell.cp(`${t.context.tmp}/myfile.txt`, `${t.context.tmp}/myfile.txt`);
+  t.truthy(shell.error());
+  t.is(result.code, 1);
+  t.truthy(result.stderr.match(/are the same file/));
+
+  // File content must be preserved (no data loss)
+  t.is(shell.cat(`${t.context.tmp}/myfile.txt`).toString(), 'important data');
+});
diff --git a/test/dirs.js b/test/dirs.js
index 085a1294f..44f82486a 100644
--- a/test/dirs.js
+++ b/test/dirs.js
@@ -1,12 +1,12 @@
-import path from 'path';
+const path = require('path');
 
-import test from 'ava';
+const test = require('ava');
 
-import shell from '..';
+const shell = require('..');
 
 test.beforeEach(() => {
   shell.config.resetForTesting();
-  shell.pushd('resources/pushd');
+  shell.pushd('test/resources/pushd');
   shell.pushd('a');
 });
 
@@ -15,8 +15,8 @@ test.beforeEach(() => {
 //
 
 const trail = [
-  path.resolve(path.resolve(), 'resources/pushd/a'),
-  path.resolve(path.resolve(), 'resources/pushd'),
+  path.resolve(path.resolve(), 'test/resources/pushd/a'),
+  path.resolve(path.resolve(), 'test/resources/pushd'),
   path.resolve(),
 ];
 
diff --git a/test/docs.js b/test/docs.js
new file mode 100644
index 000000000..67d503462
--- /dev/null
+++ b/test/docs.js
@@ -0,0 +1,11 @@
+const test = require('ava');
+
+const gendocs = require('../scripts/generate-docs');
+
+test('Documentation generation', t => {
+  if (gendocs.extractCurrentDocs() === gendocs.generateNewDocs()) {
+    t.pass();
+  } else {
+    t.fail('README documentation is stale. Please run `npm run gendocs`.');
+  }
+});
diff --git a/test/echo.js b/test/echo.js
index 7887d88ee..c6989ac1e 100644
--- a/test/echo.js
+++ b/test/echo.js
@@ -1,59 +1,153 @@
-import test from 'ava';
+const test = require('ava');
 
-import shell from '..';
-import utils from './utils/utils';
+const shell = require('..');
+const utils = require('./utils/utils');
+const mocks = require('./utils/mocks');
 
 shell.config.silent = true;
 
+test.beforeEach(t => {
+  t.context.tmp = utils.getTempDir();
+  mocks.stdout.init();
+  mocks.stderr.init();
+});
+
+test.afterEach.always(t => {
+  shell.rm('-rf', t.context.tmp);
+  mocks.stdout.restore();
+  mocks.stderr.restore();
+});
+
 //
 // Valids
 //
 
-test.cb('simple test with defaults', t => {
-  const script = 'require(\'../global.js\'); echo("hello", "world");';
-  utils.runScript(script, (err, stdout, stderr) => {
-    t.falsy(err);
-    t.is(stdout, 'hello world\n');
-    t.is(stderr, '');
-    t.end();
-  });
-});
-
-test.cb('allow arguments to begin with a hyphen', t => {
-  // see issue #20
-  const script = 'require(\'../global.js\'); echo("-asdf", "111");';
-  utils.runScript(script, (err, stdout, stderr) => {
-    t.falsy(err);
-    t.is(stdout, '-asdf 111\n');
-    t.is(stderr, '');
-    t.end();
-  });
-});
-
-test.cb("using null as an explicit argument doesn't crash the function", t => {
-  const script = 'require(\'../global.js\'); echo(null);';
-  utils.runScript(script, (err, stdout, stderr) => {
-    t.falsy(err);
-    t.is(stdout, 'null\n');
-    t.is(stderr, '');
-    t.end();
-  });
-});
-
-test.cb('simple test with silent(true)', t => {
-  const script = 'require(\'../global.js\'); config.silent=true; echo(555);';
-  utils.runScript(script, (err, stdout) => {
-    t.falsy(err);
-    t.is(stdout, '555\n');
-    t.end();
-  });
-});
-
-test.cb('-e option', t => {
-  const script = "require('../global.js'); echo('-e', '\\tmessage');";
-  utils.runScript(script, (err, stdout) => {
-    t.falsy(err);
-    t.is(stdout, '\tmessage\n');
-    t.end();
-  });
+test('simple test with defaults', t => {
+  const result = shell.echo('hello', 'world');
+  const stdout = mocks.stdout.getValue();
+  const stderr = mocks.stderr.getValue();
+  t.falsy(shell.error());
+  t.is(result.code, 0);
+  t.is(stdout, 'hello world\n');
+  t.is(stderr, '');
+});
+
+test('allow arguments to begin with a hyphen', t => {
+  // Github issue #20
+  const result = shell.echo('-asdf', '111');
+  const stdout = mocks.stdout.getValue();
+  const stderr = mocks.stderr.getValue();
+  t.falsy(shell.error());
+  t.is(result.code, 1);
+  t.is(stdout, '-asdf 111\n');
+  t.is(stderr, '');
+});
+
+test("using null as an explicit argument doesn't crash the function", t => {
+  const result = shell.echo(null);
+  const stdout = mocks.stdout.getValue();
+  const stderr = mocks.stderr.getValue();
+  t.falsy(shell.error());
+  t.is(result.code, 0);
+  t.is(stdout, 'null\n');
+  t.is(stderr, '');
+});
+
+test('-e option', t => {
+  const result = shell.echo('-e', '\tmessage');
+  const stdout = mocks.stdout.getValue();
+  const stderr = mocks.stderr.getValue();
+  t.falsy(shell.error());
+  t.is(result.code, 0);
+  t.is(stdout, '\tmessage\n');
+  t.is(stderr, '');
+});
+
+test('piping to a file', t => {
+  // Github issue #476
+  shell.mkdir(t.context.tmp);
+  const tmp = `${t.context.tmp}/echo.txt`;
+  const resultA = shell.echo('A').toEnd(tmp);
+  t.falsy(shell.error());
+  t.is(resultA.code, 0);
+  const resultB = shell.echo('B').toEnd(tmp);
+  t.falsy(shell.error());
+  t.is(resultB.code, 0);
+  const result = shell.cat(tmp);
+  const stdout = mocks.stdout.getValue();
+  const stderr = mocks.stderr.getValue();
+  t.falsy(shell.error());
+  t.is(stdout, 'A\nB\n');
+  t.is(stderr, '');
+  t.is(result.toString(), 'A\nB\n');
+});
+
+test('-n option', t => {
+  const result = shell.echo('-n', 'message');
+  const stdout = mocks.stdout.getValue();
+  const stderr = mocks.stderr.getValue();
+  t.falsy(shell.error());
+  t.is(result.code, 0);
+  t.is(stdout, 'message');
+  t.is(stderr, '');
+});
+
+test('-ne option', t => {
+  const result = shell.echo('-ne', 'message');
+  const stdout = mocks.stdout.getValue();
+  const stderr = mocks.stderr.getValue();
+  t.falsy(shell.error());
+  t.is(result.code, 0);
+  t.is(stdout, 'message');
+  t.is(stderr, '');
+});
+
+test('-en option', t => {
+  const result = shell.echo('-en', 'message');
+  const stdout = mocks.stdout.getValue();
+  const stderr = mocks.stderr.getValue();
+  t.falsy(shell.error());
+  t.is(result.code, 0);
+  t.is(stdout, 'message');
+  t.is(stderr, '');
+});
+
+test('-en option with escaped characters', t => {
+  const result = shell.echo('-en', '\tmessage\n');
+  const stdout = mocks.stdout.getValue();
+  const stderr = mocks.stderr.getValue();
+  t.falsy(shell.error());
+  t.is(result.code, 0);
+  t.is(stdout, '\tmessage\n');
+  t.is(stderr, '');
+});
+
+test('piping to a file with -n', t => {
+  // Github issue #476
+  shell.mkdir(t.context.tmp);
+  const tmp = `${t.context.tmp}/echo.txt`;
+  const resultA = shell.echo('-n', 'A').toEnd(tmp);
+  t.falsy(shell.error());
+  t.is(resultA.code, 0);
+  const resultB = shell.echo('-n', 'B').toEnd(tmp);
+  t.falsy(shell.error());
+  t.is(resultB.code, 0);
+  const result = shell.cat(tmp);
+  const stdout = mocks.stdout.getValue();
+  const stderr = mocks.stderr.getValue();
+  t.falsy(shell.error());
+  t.is(stdout, 'AB');
+  t.is(stderr, '');
+  t.is(result.toString(), 'AB');
+});
+
+test('stderr with unrecognized options is empty', t => {
+  const result = shell.echo('-asdf');
+  const stdout = mocks.stdout.getValue();
+  const stderr = mocks.stderr.getValue();
+  t.falsy(shell.error());
+  t.is(result.code, 1);
+  t.falsy(result.stderr);
+  t.is(stdout, '-asdf\n');
+  t.is(stderr, '');
 });
diff --git a/test/env.js b/test/env.js
index 50a143545..a9f2c009e 100644
--- a/test/env.js
+++ b/test/env.js
@@ -1,6 +1,6 @@
-import test from 'ava';
+const test = require('ava');
 
-import shell from '..';
+const shell = require('..');
 
 shell.config.silent = true;
 
diff --git a/test/exec.js b/test/exec.js
index bf41d7a08..79caca5da 100644
--- a/test/exec.js
+++ b/test/exec.js
@@ -1,19 +1,27 @@
-import os from 'os';
-import path from 'path';
-import util from 'util';
+const os = require('os');
+const path = require('path');
+const util = require('util');
 
-import test from 'ava';
+const test = require('ava');
 
-import shell from '..';
-import common from '../src/common';
+const shell = require('..');
+const utils = require('./utils/utils');
+const mocks = require('./utils/mocks');
 
 const CWD = process.cwd();
-const ORIG_EXEC_PATH = common.config.execPath;
+const ORIG_EXEC_PATH = shell.config.execPath;
 shell.config.silent = true;
 
+test.beforeEach(() => {
+  mocks.stdout.init();
+  mocks.stderr.init();
+});
+
 test.afterEach.always(() => {
   process.chdir(CWD);
-  common.config.execPath = ORIG_EXEC_PATH;
+  shell.config.execPath = ORIG_EXEC_PATH;
+  mocks.stdout.restore();
+  mocks.stderr.restore();
 });
 
 //
@@ -35,12 +43,21 @@ test('config.fatal and unknown command', t => {
   shell.config.fatal = true;
   t.throws(() => {
     shell.exec('asdfasdf'); // could not find command
-  }, /exec: internal error/);
+  }, { message: /asdfasdf/ }); // name of command should be in error message
   shell.config.fatal = oldFatal;
 });
 
+test('options.fatal = true and unknown command', t => {
+  const oldFatal = shell.config.fatal;
+  shell.config.fatal = false;
+  t.throws(() => {
+    shell.exec('asdfasdf', { fatal: true }); // could not find command
+  }, { message: /asdfasdf/ }); // name of command should be in error message
+  shell.config.fatal = oldFatal; // TODO(nfischer): this setting won't get reset if the assertion above fails
+});
+
 test('exec exits gracefully if we cannot find the execPath', t => {
-  common.config.execPath = null;
+  shell.config.execPath = null;
   shell.exec('echo foo');
   t.regex(
     shell.error(),
@@ -48,6 +65,11 @@ test('exec exits gracefully if we cannot find the execPath', t => {
   );
 });
 
+test('exec-child.js should not be imported', t => {
+  const execChild = require('../src/exec-child');
+  t.deepEqual([], Object.keys(execChild));
+});
+
 //
 // Valids
 //
@@ -57,14 +79,14 @@ test('exec exits gracefully if we cannot find the execPath', t => {
 //
 
 test('check if stdout goes to output', t => {
-  const result = shell.exec(`${JSON.stringify(common.config.execPath)} -e "console.log(1234);"`);
+  const result = shell.exec(`${JSON.stringify(shell.config.execPath)} -e "console.log(1234);"`);
   t.falsy(shell.error());
   t.is(result.code, 0);
   t.is(result.stdout, '1234\n');
 });
 
 test('check if stderr goes to output', t => {
-  const result = shell.exec(`${JSON.stringify(common.config.execPath)} -e "console.error(1234);"`);
+  const result = shell.exec(`${JSON.stringify(shell.config.execPath)} -e "console.error(1234);"`);
   t.falsy(shell.error());
   t.is(result.code, 0);
   t.is(result.stdout, '');
@@ -72,29 +94,37 @@ test('check if stderr goes to output', t => {
 });
 
 test('check if stdout + stderr go to output', t => {
-  const result = shell.exec(`${JSON.stringify(common.config.execPath)} -e "console.error(1234); console.log(666);"`);
+  const result = shell.exec(`${JSON.stringify(shell.config.execPath)} -e "console.error(1234); console.log(666);"`);
   t.falsy(shell.error());
   t.is(result.code, 0);
   t.is(result.stdout, '666\n');
   t.is(result.stderr, '1234\n');
 });
 
+test('check if stdout + stderr should not be printed to console if silent', t => {
+  shell.exec(`${JSON.stringify(shell.config.execPath)} -e "console.error(1234); console.log(666); process.exit(12);"`, { silent: true });
+  const stdout = mocks.stdout.getValue();
+  const stderr = mocks.stderr.getValue();
+  t.is(stdout, '');
+  t.is(stderr, '');
+});
+
 test('check exit code', t => {
-  const result = shell.exec(`${JSON.stringify(common.config.execPath)} -e "process.exit(12);"`);
+  const result = shell.exec(`${JSON.stringify(shell.config.execPath)} -e "process.exit(12);"`);
   t.truthy(shell.error());
   t.is(result.code, 12);
 });
 
 test('interaction with cd', t => {
-  shell.cd('resources/external');
-  const result = shell.exec(`${JSON.stringify(common.config.execPath)} node_script.js`);
+  shell.cd('test/resources/external');
+  const result = shell.exec(`${JSON.stringify(shell.config.execPath)} node_script.js`);
   t.falsy(shell.error());
   t.is(result.code, 0);
   t.is(result.stdout, 'node_script_1234\n');
 });
 
 test('check quotes escaping', t => {
-  const result = shell.exec(util.format(JSON.stringify(common.config.execPath) + ' -e "console.log(%s);"', "\\\"\\'+\\'_\\'+\\'\\\""));
+  const result = shell.exec(util.format(JSON.stringify(shell.config.execPath) + ' -e "console.log(%s);"', "\\\"\\'+\\'_\\'+\\'\\\""));
   t.falsy(shell.error());
   t.is(result.code, 0);
   t.is(result.stdout, "'+'_'+'\n");
@@ -113,22 +143,23 @@ test('set maxBuffer (very small)', t => {
   t.falsy(shell.error());
   t.is(result.code, 0);
   t.is(result.stdout, '1234567890' + os.EOL);
-  if (process.version >= 'v0.11') { // this option doesn't work on v0.10
-    shell.exec('echo 1234567890', { maxBuffer: 6 });
-    t.truthy(shell.error());
-  }
+  const result2 = shell.exec('echo 1234567890', { maxBuffer: 6 });
+  t.truthy(shell.error());
+  t.is(result2.code, 1);
+  t.is(result2.stdout, '1234567890' + os.EOL);
+  const maxBufferErrorPattern = /.*\bmaxBuffer\b.*\bexceeded\b.*/;
+  t.regex(result2.stderr, maxBufferErrorPattern);
 });
 
 test('set timeout option', t => {
-  const result = shell.exec(`${JSON.stringify(common.config.execPath)} resources/exec/slow.js 100`); // default timeout is ok
+  let result = shell.exec(`${JSON.stringify(shell.config.execPath)} test/resources/exec/slow.js 100`); // default timeout is ok
   t.falsy(shell.error());
   t.is(result.code, 0);
-  if (process.version >= 'v0.11') {
-    // this option doesn't work on v0.10
-    shell.exec(`${JSON.stringify(common.config.execPath)} resources/exec/slow.js 100`, { timeout: 10 }); // times out
-
-    t.truthy(shell.error());
-  }
+  t.is(result.stdout, 'fast\nslow\n');
+  result = shell.exec(`${JSON.stringify(shell.config.execPath)} test/resources/exec/slow.js 2000`, { timeout: 1000 }); // times out
+  t.truthy(shell.error());
+  t.is(result.code, 1);
+  t.is(result.stdout, 'fast\n');
 });
 
 test('check process.env works', t => {
@@ -142,20 +173,19 @@ test('check process.env works', t => {
 });
 
 test('set shell option (TODO: add tests for Windows)', t => {
-  if (process.platform !== 'win32') {
+  utils.skipOnWin(t, () => {
     let result = shell.exec('echo $0');
     t.falsy(shell.error());
     t.is(result.code, 0);
     t.is(result.stdout, '/bin/sh\n'); // sh by default
     const bashPath = shell.which('bash').trim();
-    // this option doesn't work on v0.10
-    if (bashPath && process.version >= 'v0.11') {
-      result = shell.exec('echo $0', { shell: '/bin/bash' });
+    if (bashPath) {
+      result = shell.exec('echo $0', { shell: bashPath });
       t.falsy(shell.error());
       t.is(result.code, 0);
-      t.is(result.stdout, '/bin/bash\n');
+      t.is(result.stdout, `${bashPath}\n`);
     }
-  }
+  });
 });
 
 test('exec returns a ShellString', t => {
@@ -166,40 +196,76 @@ test('exec returns a ShellString', t => {
   t.is(result.toString(), result.stdout);
 });
 
+test('encoding option works', t => {
+  const result = shell.exec(`${JSON.stringify(shell.config.execPath)} -e "console.log(1234);"`, { encoding: 'buffer' });
+  t.falsy(shell.error());
+  t.is(result.code, 0);
+  t.truthy(Buffer.isBuffer(result.stdout));
+  t.truthy(Buffer.isBuffer(result.stderr));
+  t.is(result.stdout.toString(), '1234\n');
+  t.is(result.stderr.toString(), '');
+});
+
+test('options.fatal = false and unknown command', t => {
+  const oldFatal = shell.config.fatal;
+  shell.config.fatal = true;
+  const result = shell.exec('asdfasdf', { fatal: false }); // could not find command
+  shell.config.fatal = oldFatal;
+  t.truthy(shell.error());
+  t.truthy(result.code);
+});
+
 //
 // async
 //
 
-test.cb('no callback', t => {
-  const c = shell.exec(`${JSON.stringify(common.config.execPath)} -e "console.log(1234)"`, { async: true });
+function execAsync(...execArgs) {
+  return new Promise((resolve) => {
+    shell.exec(...execArgs, (code, stdout, stderr) => {
+      resolve({ code, stdout, stderr });
+    });
+  });
+}
+
+test('no callback', t => {
+  const c = shell.exec(`${JSON.stringify(shell.config.execPath)} -e "console.log(1234)"`, { async: true });
   t.falsy(shell.error());
   t.truthy('stdout' in c, 'async exec returns child process object');
-  t.end();
 });
 
-test.cb('callback as 2nd argument', t => {
-  shell.exec(`${JSON.stringify(common.config.execPath)} -e "console.log(5678);"`, (code, stdout, stderr) => {
-    t.is(code, 0);
-    t.is(stdout, '5678\n');
-    t.is(stderr, '');
-    t.end();
-  });
+test('callback as 2nd argument', async t => {
+  const result = await execAsync(`${JSON.stringify(shell.config.execPath)} -e "console.log(5678);"`);
+  t.is(result.code, 0);
+  t.is(result.stdout, '5678\n');
+  t.is(result.stderr, '');
 });
 
-test.cb('callback as end argument', t => {
-  shell.exec(`${JSON.stringify(common.config.execPath)} -e "console.log(5566);"`, { async: true }, (code, stdout, stderr) => {
-    t.is(code, 0);
-    t.is(stdout, '5566\n');
-    t.is(stderr, '');
-    t.end();
-  });
+test('callback as end argument', async t => {
+  const result = await execAsync(`${JSON.stringify(shell.config.execPath)} -e "console.log(5566);"`, { async: true });
+  t.is(result.code, 0);
+  t.is(result.stdout, '5566\n');
+  t.is(result.stderr, '');
 });
 
-test.cb('callback as 3rd argument (silent:true)', t => {
-  shell.exec(`${JSON.stringify(common.config.execPath)} -e "console.log(5678);"`, { silent: true }, (code, stdout, stderr) => {
-    t.is(code, 0);
-    t.is(stdout, '5678\n');
-    t.is(stderr, '');
-    t.end();
-  });
+test('callback as 3rd argument (silent:true)', async t => {
+  const result = await execAsync(`${JSON.stringify(shell.config.execPath)} -e "console.log(5678);"`, { silent: true });
+  t.is(result.code, 0);
+  t.is(result.stdout, '5678\n');
+  t.is(result.stderr, '');
+});
+
+test('command that fails', async t => {
+  const result = await execAsync('shx cp onlyOneCpArgument.txt', { silent: true });
+  t.is(result.code, 1);
+  t.is(result.stdout, '');
+  t.is(result.stderr, 'cp: missing <source> and/or <dest>\n');
+});
+
+test('encoding option works with async', async t => {
+  const result = await execAsync(`${JSON.stringify(shell.config.execPath)} -e "console.log(5566);"`, { async: true, encoding: 'buffer' });
+  t.is(result.code, 0);
+  t.truthy(Buffer.isBuffer(result.stdout));
+  t.truthy(Buffer.isBuffer(result.stderr));
+  t.is(result.stdout.toString(), '5566\n');
+  t.is(result.stderr.toString(), '');
 });
diff --git a/test/exit.js b/test/exit.js
new file mode 100644
index 000000000..b0add2552
--- /dev/null
+++ b/test/exit.js
@@ -0,0 +1,57 @@
+const test = require('ava');
+
+const shell = require('..');
+
+const mocks = require('./utils/mocks');
+
+//
+// Valids
+//
+
+function runExitInSubprocess(code) {
+  const script = code !== undefined
+    ? `var shell = require("."); shell.exit(${code});`
+    : 'var shell = require("."); shell.exit();';
+  const result = shell.exec(
+      `${JSON.stringify(shell.config.execPath)} -e ${JSON.stringify(script)}`
+  );
+  const actualReturnCode = result.code;
+  return actualReturnCode;
+}
+
+test('exit with success status code', t => {
+  t.is(runExitInSubprocess(0), 0);
+});
+
+test('exit without explicit code should be success', t => {
+  t.is(runExitInSubprocess(), 0);
+});
+
+test('exit with failure status code', t => {
+  t.is(runExitInSubprocess(5), 5);
+  t.is(runExitInSubprocess(2), 2);
+  t.is(runExitInSubprocess(25), 25);
+});
+
+test('exit correctly sets the shell.errorCode()', t => {
+  try {
+    mocks.exit.init();
+    shell.exit(5); // Safe to call shell.exit() because it's mocked.
+    t.is(shell.errorCode(), 5);
+    t.is(mocks.exit.getValue(), 5);
+    t.truthy(shell.error());
+
+    shell.exit(0); // Safe to call shell.exit() because it's mocked.
+    t.is(shell.errorCode(), 0);
+    t.falsy(mocks.exit.getValue());
+    t.falsy(shell.error());
+
+    // Also try it without an explicit argument.
+    shell.exit(); // Safe to call shell.exit() because it's mocked.
+    t.is(shell.errorCode(), 0);
+    t.falsy(mocks.exit.getValue());
+    t.falsy(shell.error());
+  } finally {
+    mocks.exit.restore();
+  }
+});
diff --git a/test/find.js b/test/find.js
index 5e65bd9ec..f698028df 100644
--- a/test/find.js
+++ b/test/find.js
@@ -1,6 +1,6 @@
-import test from 'ava';
+const test = require('ava');
 
-import shell from '..';
+const shell = require('..');
 
 const CWD = process.cwd();
 
@@ -24,39 +24,53 @@ test('no args', t => {
 //
 
 test('current path', t => {
-  shell.cd('resources/find');
+  shell.cd('test/resources/find');
   const result = shell.find('.');
   t.falsy(shell.error());
   t.is(result.code, 0);
-  t.truthy(result.indexOf('.hidden') > -1);
-  t.truthy(result.indexOf('dir1/dir11/a_dir11') > -1);
-  t.is(result.length, 11);
+  t.truthy(result.includes('.hidden'));
+  t.truthy(result.includes('dir1/dir11/a_dir11'));
+  t.is(result.length, 12);
   shell.cd('../..');
 });
 
 test('simple path', t => {
-  const result = shell.find('resources/find');
+  const result = shell.find('test/resources/find');
   t.falsy(shell.error());
   t.is(result.code, 0);
-  t.truthy(result.indexOf('resources/find/.hidden') > -1);
-  t.truthy(result.indexOf('resources/find/dir1/dir11/a_dir11') > -1);
-  t.is(result.length, 11);
+  t.truthy(result.includes('test/resources/find/.hidden'));
+  t.truthy(result.includes('test/resources/find/dir1/dir11/a_dir11'));
+  t.is(result.length, 12);
 });
 
 test('multiple paths - comma', t => {
-  const result = shell.find('resources/find/dir1', 'resources/find/dir2');
+  const result = shell.find('test/resources/find/dir1', 'test/resources/find/dir2');
   t.falsy(shell.error());
   t.is(result.code, 0);
-  t.truthy(result.indexOf('resources/find/dir1/dir11/a_dir11') > -1);
-  t.truthy(result.indexOf('resources/find/dir2/a_dir1') > -1);
+  t.truthy(result.includes('test/resources/find/dir1/dir11/a_dir11'));
+  t.truthy(result.includes('test/resources/find/dir2/a_dir1'));
   t.is(result.length, 6);
 });
 
 test('multiple paths - array', t => {
-  const result = shell.find(['resources/find/dir1', 'resources/find/dir2']);
+  const result = shell.find(['test/resources/find/dir1', 'test/resources/find/dir2']);
   t.falsy(shell.error());
   t.is(result.code, 0);
-  t.truthy(result.indexOf('resources/find/dir1/dir11/a_dir11') > -1);
-  t.truthy(result.indexOf('resources/find/dir2/a_dir1') > -1);
+  t.truthy(result.includes('test/resources/find/dir1/dir11/a_dir11'));
+  t.truthy(result.includes('test/resources/find/dir2/a_dir1'));
   t.is(result.length, 6);
 });
+
+test('nonexistent path', t => {
+  const result = shell.find('test/resources/find/nonexistent');
+  t.is(shell.error(), 'find: no such file or directory: test/resources/find/nonexistent');
+  t.is(result.code, 1);
+});
+
+test('-L flag, folder is symlinked', t => {
+  const result = shell.find('-L', 'test/resources/find');
+  t.falsy(shell.error());
+  t.is(result.code, 0);
+  t.truthy(result.includes('test/resources/find/dir2_link/a_dir1'));
+  t.is(result.length, 13);
+});
diff --git a/test/global.js b/test/global.js
index 3f339e2b6..81227f00a 100644
--- a/test/global.js
+++ b/test/global.js
@@ -1,10 +1,10 @@
 /* globals cat, config, cp, env, error, mkdir, rm */
-import fs from 'fs';
+const fs = require('fs');
 
-import test from 'ava';
+const test = require('ava');
 
-import '../global';
-import utils from './utils/utils';
+require('../global');
+const utils = require('./utils/utils');
 
 test.beforeEach(t => {
   t.context.tmp = utils.getTempDir();
@@ -26,14 +26,14 @@ test('env is exported', t => {
 });
 
 test('cat', t => {
-  const result = cat('resources/cat/file1');
+  const result = cat('test/resources/cat/file1');
   t.falsy(error());
   t.is(result.code, 0);
   t.is(result.toString(), 'test1\n');
 });
 
 test('rm', t => {
-  cp('-f', 'resources/file1', `${t.context.tmp}/file1`);
+  cp('-f', 'test/resources/file1', `${t.context.tmp}/file1`);
   t.truthy(fs.existsSync(`${t.context.tmp}/file1`));
   const result = rm(`${t.context.tmp}/file1`);
   t.falsy(error());
@@ -47,4 +47,3 @@ test('String.prototype is modified for global require', t => {
   'bar'.toEnd(`${t.context.tmp}/testfile.txt`);
   t.is('foobar', cat(`${t.context.tmp}/testfile.txt`).toString());
 });
-
diff --git a/test/grep.js b/test/grep.js
index 3d9dc2335..4b64d6e76 100644
--- a/test/grep.js
+++ b/test/grep.js
@@ -1,14 +1,14 @@
-import fs from 'fs';
+const fs = require('fs');
 
-import test from 'ava';
+const test = require('ava');
 
-import shell from '..';
-import utils from './utils/utils';
+const shell = require('..');
+const utils = require('./utils/utils');
 
 test.beforeEach(t => {
   t.context.tmp = utils.getTempDir();
   shell.config.resetForTesting();
-  shell.cp('-r', 'resources', t.context.tmp);
+  shell.cp('-r', 'test/resources', t.context.tmp);
 });
 
 test.afterEach.always(t => {
@@ -24,6 +24,7 @@ test('no args', t => {
   const result = shell.grep();
   t.truthy(shell.error());
   t.is(result.code, 2);
+  t.is(shell.errorCode(), 2);
 });
 
 test('too few args', t => {
@@ -49,90 +50,367 @@ test('if at least one file is missing, this should be an error', t => {
   t.is(result.code, 2);
 });
 
+test("multiple files, one doesn't exist, one doesn't match", t => {
+  const result = shell.grep(/oogabooga/, 'test/resources/file1.txt',
+    'test/resources/filedoesnotexist.txt');
+  t.truthy(shell.error());
+  t.is(result.code, 2);
+});
+
+test('-A option, negative value', t => {
+  const result = shell.grep('-A', -2, 'test*', 'test/resources/grep/file3');
+  t.truthy(shell.error());
+  t.is(result.code, 2);
+  t.is(result.stderr, 'grep: -2: invalid context length argument');
+});
+
+test('-B option, negative value', t => {
+  const result = shell.grep('-B', -3, 'test*', 'test/resources/grep/file3');
+  t.truthy(shell.error());
+  t.is(result.code, 2);
+  t.is(result.stderr, 'grep: -3: invalid context length argument');
+});
+
+test('-C option, negative value', t => {
+  const result = shell.grep('-C', -1, 'test*', 'test/resources/grep/file3');
+  t.truthy(shell.error());
+  t.is(result.code, 2);
+  t.is(result.stderr, 'grep: -1: invalid context length argument');
+});
+
 //
 // Valids
 //
 
 test('basic', t => {
-  const result = shell.grep('line', 'resources/a.txt');
+  const result = shell.grep('line', 'test/resources/a.txt');
   t.falsy(shell.error());
   t.is(result.split('\n').length - 1, 4);
 });
 
 test('-v option', t => {
-  const result = shell.grep('-v', 'line', 'resources/a.txt');
+  const result = shell.grep('-v', 'line', 'test/resources/a.txt');
   t.falsy(shell.error());
   t.is(result.split('\n').length - 1, 8);
 });
 
 test('matches one line', t => {
-  const result = shell.grep('line one', 'resources/a.txt');
+  const result = shell.grep('line one', 'test/resources/a.txt');
   t.falsy(shell.error());
   t.is(result.toString(), 'This is line one\n');
 });
 
 test('multiple files', t => {
-  const result = shell.grep(/test/, 'resources/file1.txt',
-    'resources/file2.txt');
+  const result = shell.grep(/test/, 'test/resources/file1.txt',
+    'test/resources/file2.txt');
   t.falsy(shell.error());
   t.is(result.toString(), 'test1\ntest2\n');
 });
 
 test('multiple files, array syntax', t => {
-  const result = shell.grep(/test/, ['resources/file1.txt',
-    'resources/file2.txt']);
+  const result = shell.grep(/test/, ['test/resources/file1.txt',
+    'test/resources/file2.txt']);
   t.falsy(shell.error());
   t.is(result.toString(), 'test1\ntest2\n');
 });
 
 test('multiple files, glob syntax, * for file name', t => {
-  const result = shell.grep(/test/, 'resources/file*.txt');
+  const result = shell.grep(/test/, 'test/resources/file*.txt');
   t.falsy(shell.error());
   t.truthy(result.toString(), 'test1\ntest2\n');
 });
 
 test('multiple files, glob syntax, * for directory name', t => {
-  const result = shell.grep(/test/, 'r*/file*.txt');
+  const result = shell.grep(/test/, 'test/r*/file*.txt');
   t.falsy(shell.error());
   t.is(result.toString(), 'test1\ntest2\n');
 });
 
 test('multiple files, double-star glob', t => {
-  const result = shell.grep(/test/, 'resources/**/file*.js');
+  const result = shell.grep(/test/, 'test/resources/**/file*.js');
   t.falsy(shell.error());
   t.is(result.toString(), 'test\ntest\ntest\ntest\n');
 });
 
 test('one file, * in regex', t => {
-  const result = shell.grep(/alpha*beta/, 'resources/grep/file');
+  const result = shell.grep(/alpha*beta/, 'test/resources/grep/file');
   t.falsy(shell.error());
   t.is(result.toString(), 'alphaaaaaaabeta\nalphbeta\n');
 });
 
 test('one file, * in string-regex', t => {
-  const result = shell.grep('alpha*beta', 'resources/grep/file');
+  const result = shell.grep('alpha*beta', 'test/resources/grep/file');
   t.falsy(shell.error());
   t.is(result.toString(), 'alphaaaaaaabeta\nalphbeta\n');
 });
 
 test('one file, * in regex, make sure * is not globbed', t => {
-  const result = shell.grep(/l*\.js/, 'resources/grep/file');
+  const result = shell.grep(/l*\.js/, 'test/resources/grep/file');
   t.falsy(shell.error());
   t.is(result.toString(), 'this line ends in.js\nlllllllllllllllll.js\n');
 });
 
 test('one file, * in string-regex, make sure * is not globbed', t => {
-  const result = shell.grep('l*\\.js', 'resources/grep/file');
+  const result = shell.grep('l*\\.js', 'test/resources/grep/file');
   t.falsy(shell.error());
   t.is(result.toString(), 'this line ends in.js\nlllllllllllllllll.js\n');
 });
 
+test("one file, pattern doesn't match", t => {
+  const result = shell.grep('notfoundstring', 'test/resources/grep/file');
+  t.truthy(shell.error());
+  t.is(result.toString(), '');
+  t.is(result.stdout, '');
+  // TODO(#900): "grep: " isn't really the correct stderr output, but we need a
+  // non-empty string so `shell.error()` is truthy.
+  t.is(result.stderr, 'grep: ');
+  t.is(result.code, 1);
+});
+
 test('-l option', t => {
-  const result = shell.grep('-l', 'test1', 'resources/file1', 'resources/file2',
-    'resources/file1.txt');
+  const result = shell.grep('-l', 'test1', 'test/resources/file1', 'test/resources/file2',
+    'test/resources/file1.txt');
   t.falsy(shell.error());
   t.truthy(result.match(/file1(\n|$)/));
   t.truthy(result.match(/file1.txt/));
   t.falsy(result.match(/file2.txt/));
   t.is(result.split('\n').length - 1, 2);
 });
+
+test('-i option', t => {
+  const result = shell.grep('-i', 'test', 'test/resources/grep/case1', 'test/resources/grep/case1.txt',
+    'test/resources/grep/case1.js');
+  t.falsy(shell.error());
+  t.is(result.split('\n').length - 1, 3);
+});
+
+test('-n option', t => {
+  const result = shell.grep('-n', /alpha*beta/, 'test/resources/grep/file');
+  t.falsy(shell.error());
+  t.is(result.toString(), '1:alphaaaaaaabeta\n3:alphbeta\n');
+});
+
+test('the pattern looks like an option', t => {
+  const result = shell.grep('--', '-v', 'test/resources/grep/file2');
+  t.falsy(shell.error());
+  t.is(result.toString(), '-v\n-vv\n');
+});
+
+//
+// Before & after contexts
+//
+test('-B option', t => {
+  const result = shell.grep('-B', 3, 'test*', 'test/resources/grep/file3');
+  t.falsy(shell.error());
+  t.is(
+    result.toString(),
+    'line1\n' +
+      'line2 test line\n' +
+      'line3 test line\n' +
+      '--\n' +
+      'line7\n' +
+      'line8\n' +
+      'line9\n' +
+      'line10 test line\n' +
+      '--\n' +
+      'line12\n' +
+      'line13\n' +
+      'line14\n' +
+      'line15 test line\n',
+  );
+});
+
+test('-B option, -n option', t => {
+  const result = shell.grep('-nB', 3, 'test*', 'test/resources/grep/file3');
+  t.falsy(shell.error());
+  t.is(
+    result.toString(),
+    '1-line1\n' +
+      '2:line2 test line\n' +
+      '3:line3 test line\n' +
+      '--\n' +
+      '7-line7\n' +
+      '8-line8\n' +
+      '9-line9\n' +
+      '10:line10 test line\n' +
+      '--\n' +
+      '12-line12\n' +
+      '13-line13\n' +
+      '14-line14\n' +
+      '15:line15 test line\n',
+  );
+});
+
+test('-A option', t => {
+  const result = shell.grep('-A', 2, 'test*', 'test/resources/grep/file3');
+  t.falsy(shell.error());
+  t.is(
+    result.toString(),
+    'line2 test line\n' +
+      'line3 test line\n' +
+      'line4\n' +
+      'line5\n' +
+      '--\n' +
+      'line10 test line\n' +
+      'line11\n' +
+      'line12\n' +
+      '--\n' +
+      'line15 test line\n',
+  );
+});
+
+test('-A option, -B option', t => {
+  const result = shell.grep(
+    { '-A': 2, '-B': 3 },
+    'test*',
+    'test/resources/grep/file3',
+  );
+  t.falsy(shell.error());
+  t.is(
+    result.toString(),
+    'line1\n' +
+      'line2 test line\n' +
+      'line3 test line\n' +
+      'line4\n' +
+      'line5\n' +
+      '--\n' +
+      'line7\n' +
+      'line8\n' +
+      'line9\n' +
+      'line10 test line\n' +
+      'line11\n' +
+      'line12\n' +
+      'line13\n' +
+      'line14\n' +
+      'line15 test line\n',
+  );
+});
+
+test('-A option, -B option, -n option', t => {
+  const result = shell.grep(
+    { '-n': true, '-A': 2, '-B': 3 },
+    'test*',
+    'test/resources/grep/file3',
+  );
+  t.falsy(shell.error());
+  t.is(
+    result.toString(),
+    '1-line1\n' +
+      '2:line2 test line\n' +
+      '3:line3 test line\n' +
+      '4-line4\n' +
+      '5-line5\n' +
+      '--\n' +
+      '7-line7\n' +
+      '8-line8\n' +
+      '9-line9\n' +
+      '10:line10 test line\n' +
+      '11-line11\n' +
+      '12-line12\n' +
+      '13-line13\n' +
+      '14-line14\n' +
+      '15:line15 test line\n',
+  );
+});
+
+test('-C option', t => {
+  const result = shell.grep('-C', 3, 'test*', 'test/resources/grep/file3');
+  t.falsy(shell.error());
+  t.is(
+    result.toString(),
+    'line1\n' +
+      'line2 test line\n' +
+      'line3 test line\n' +
+      'line4\n' +
+      'line5\n' +
+      'line6\n' +
+      'line7\n' +
+      'line8\n' +
+      'line9\n' +
+      'line10 test line\n' +
+      'line11\n' +
+      'line12\n' +
+      'line13\n' +
+      'line14\n' +
+      'line15 test line\n',
+  );
+});
+
+test('-C option, small value', t => {
+  const result = shell.grep('-C', 1, 'test*', 'test/resources/grep/file3');
+  t.falsy(shell.error());
+  t.is(
+    result.toString(),
+    'line1\n' +
+      'line2 test line\n' +
+      'line3 test line\n' +
+      'line4\n' +
+      '--\n' +
+      'line9\n' +
+      'line10 test line\n' +
+      'line11\n' +
+      '--\n' +
+      'line14\n' +
+      'line15 test line\n',
+  );
+});
+
+test('-C option, large value', t => {
+  const result = shell.grep('-C', 100, 'test*', 'test/resources/grep/file3');
+  t.falsy(shell.error());
+  t.is(
+    result.toString(),
+    'line1\n' +
+      'line2 test line\n' +
+      'line3 test line\n' +
+      'line4\n' +
+      'line5\n' +
+      'line6\n' +
+      'line7\n' +
+      'line8\n' +
+      'line9\n' +
+      'line10 test line\n' +
+      'line11\n' +
+      'line12\n' +
+      'line13\n' +
+      'line14\n' +
+      'line15 test line\n',
+  );
+});
+
+test('-C option, add line separators', t => {
+  const result = shell.grep('-C', 0, 'test*', 'test/resources/grep/file3');
+  t.falsy(shell.error());
+  t.is(
+    result.toString(),
+    'line2 test line\n' +
+      'line3 test line\n' +
+      '--\n' +
+      'line10 test line\n' +
+      '--\n' +
+      'line15 test line\n',
+  );
+});
+
+test('-C option, -n option', t => {
+  const result = shell.grep('-nC', 3, 'test*', 'test/resources/grep/file3');
+  t.falsy(shell.error());
+  t.is(
+    result.toString(),
+    '1-line1\n' +
+      '2:line2 test line\n' +
+      '3:line3 test line\n' +
+      '4-line4\n' +
+      '5-line5\n' +
+      '6-line6\n' +
+      '7-line7\n' +
+      '8-line8\n' +
+      '9-line9\n' +
+      '10:line10 test line\n' +
+      '11-line11\n' +
+      '12-line12\n' +
+      '13-line13\n' +
+      '14-line14\n' +
+      '15:line15 test line\n',
+  );
+});
diff --git a/test/head.js b/test/head.js
index 19ee9e459..8f5f91574 100644
--- a/test/head.js
+++ b/test/head.js
@@ -1,8 +1,9 @@
-import fs from 'fs';
+const fs = require('fs');
 
-import test from 'ava';
+const test = require('ava');
 
-import shell from '..';
+const shell = require('..');
+const common = require('../src/common');
 
 shell.config.silent = true;
 
@@ -18,9 +19,18 @@ test('no args', t => {
 
 test('file does not exist', t => {
   t.falsy(fs.existsSync('/asdfasdf')); // sanity check
-  const result = shell.head('/adsfasdf'); // file does not exist
+  const result = shell.head('/asdfasdf'); // file does not exist
   t.truthy(shell.error());
   t.is(result.code, 1);
+  t.is(result.stderr, 'head: no such file or directory: /asdfasdf');
+});
+
+test('directory', t => {
+  t.truthy(common.statFollowLinks('test/resources/').isDirectory()); // sanity check
+  const result = shell.head('test/resources/');
+  t.truthy(shell.error());
+  t.is(result.code, 1);
+  t.is(result.stderr, "head: error reading 'test/resources/': Is a directory");
 });
 
 //
@@ -37,15 +47,15 @@ const topOfFile2 = ['file2 1', 'file2 2', 'file2 3', 'file2 4', 'file2 5',
                     'file2 16', 'file2 17', 'file2 18', 'file2 19', 'file2 20'];
 
 test('simple', t => {
-  const result = shell.head('resources/head/file1.txt');
+  const result = shell.head('test/resources/head/file1.txt');
   t.falsy(shell.error());
   t.is(result.code, 0);
   t.is(result.toString(), topOfFile1.slice(0, 10).join('\n') + '\n');
 });
 
 test('multiple files', t => {
-  const result = shell.head('resources/head/file2.txt',
-    'resources/head/file1.txt');
+  const result = shell.head('test/resources/head/file2.txt',
+    'test/resources/head/file1.txt');
   t.falsy(shell.error());
   t.is(result.code, 0);
   t.is(result.toString(), topOfFile2
@@ -55,8 +65,8 @@ test('multiple files', t => {
 });
 
 test('multiple files, array syntax', t => {
-  const result = shell.head(['resources/head/file2.txt',
-    'resources/head/file1.txt']);
+  const result = shell.head(['test/resources/head/file2.txt',
+    'test/resources/head/file1.txt']);
   t.falsy(shell.error());
   t.is(result.code, 0);
   t.is(result.toString(), topOfFile2
@@ -66,22 +76,22 @@ test('multiple files, array syntax', t => {
 });
 
 test('reading more lines than are in the file (no trailing newline)', t => {
-  const result = shell.head('resources/file2', 'resources/file1');
+  const result = shell.head('test/resources/file2', 'test/resources/file1');
   t.falsy(shell.error());
   t.is(result.code, 0);
   t.is(result.toString(), 'test2\ntest1'); // these files only have one line (no \n)
 });
 
 test('reading more lines than are in the file (with trailing newline)', t => {
-  const result = shell.head('resources/head/shortfile2',
-    'resources/head/shortfile1');
+  const result = shell.head('test/resources/head/shortfile2',
+    'test/resources/head/shortfile1');
   t.falsy(shell.error());
   t.is(result.code, 0);
   t.is(result.toString(), 'short2\nshort1\n'); // these files only have one line (with \n)
 });
 
 test('Globbed file', t => {
-  const result = shell.head('resources/head/file?.txt');
+  const result = shell.head('test/resources/head/file?.txt');
   t.falsy(shell.error());
   t.is(result.code, 0);
   t.is(result.toString(), topOfFile1
@@ -90,9 +100,9 @@ test('Globbed file', t => {
     .join('\n') + '\n');
 });
 
-test('With `\'-n\' <num>` option', t => {
-  const result = shell.head('-n', 4, 'resources/head/file2.txt',
-    'resources/head/file1.txt');
+test("With '-n <num>' option", t => {
+  const result = shell.head('-n', 4, 'test/resources/head/file2.txt',
+    'test/resources/head/file1.txt');
   t.falsy(shell.error());
   t.is(result.code, 0);
   t.is(result.toString(), topOfFile2
@@ -101,9 +111,9 @@ test('With `\'-n\' <num>` option', t => {
     .join('\n') + '\n');
 });
 
-test('With `{\'-n\': <num>}` option', t => {
-  const result = shell.head({ '-n': 4 }, 'resources/head/file2.txt',
-    'resources/head/file1.txt');
+test("With '{-n: <num>}' option", t => {
+  const result = shell.head({ '-n': 4 }, 'test/resources/head/file2.txt',
+    'test/resources/head/file1.txt');
   t.falsy(shell.error());
   t.is(result.code, 0);
   t.is(result.toString(), topOfFile2
@@ -113,8 +123,15 @@ test('With `{\'-n\': <num>}` option', t => {
 });
 
 test('negative values (-num) are the same as (numLines - num)', t => {
-  const result = shell.head('-n', -46, 'resources/head/file1.txt');
+  const result = shell.head('-n', -46, 'test/resources/head/file1.txt');
   t.falsy(shell.error());
   t.is(result.code, 0);
   t.is(result.toString(), 'file1 1\nfile1 2\nfile1 3\nfile1 4\n');
 });
+
+test('right-hand side of a pipe', t => {
+  const result = shell.cat('test/resources/head/file1.txt').head();
+  t.falsy(shell.error());
+  t.is(result.code, 0);
+  t.is(result.toString(), topOfFile1.slice(0, 10).join('\n') + '\n');
+});
diff --git a/test/ln.js b/test/ln.js
index 836be4e48..1ef01eef4 100644
--- a/test/ln.js
+++ b/test/ln.js
@@ -1,17 +1,17 @@
-import fs from 'fs';
-import path from 'path';
+const fs = require('fs');
+const path = require('path');
 
-import test from 'ava';
+const test = require('ava');
 
-import shell from '..';
-import utils from './utils/utils';
+const shell = require('..');
+const utils = require('./utils/utils');
 
 const CWD = process.cwd();
 
 test.beforeEach(t => {
   t.context.tmp = utils.getTempDir();
   shell.config.resetForTesting();
-  shell.cp('-r', 'resources', t.context.tmp);
+  shell.cp('-r', 'test/resources', t.context.tmp);
   process.chdir(CWD);
 });
 
diff --git a/test/ls.js b/test/ls.js
index a50f27006..1c8ef6276 100644
--- a/test/ls.js
+++ b/test/ls.js
@@ -1,9 +1,10 @@
-import fs from 'fs';
+const fs = require('fs');
 
-import test from 'ava';
+const test = require('ava');
 
-import shell from '..';
-import utils from './utils/utils';
+const shell = require('..');
+const common = require('../src/common');
+const utils = require('./utils/utils');
 
 const CWD = process.cwd();
 
@@ -35,10 +36,11 @@ test('no such file or dir', t => {
 // Valids
 //
 
-test('it\'s ok to use no arguments', t => {
+test("it's ok to use no arguments", t => {
   const result = shell.ls();
   t.falsy(shell.error());
   t.is(result.code, 0);
+  t.is(shell.errorCode(), 0);
 });
 
 test('root directory', t => {
@@ -48,307 +50,354 @@ test('root directory', t => {
 });
 
 test('no args provides the correct result', t => {
-  shell.cd('resources/ls');
+  shell.cd('test/resources/ls');
   const result = shell.ls();
   t.falsy(shell.error());
   t.is(result.code, 0);
-  t.truthy(result.indexOf('file1') > -1);
-  t.truthy(result.indexOf('file2') > -1);
-  t.truthy(result.indexOf('file1.js') > -1);
-  t.truthy(result.indexOf('file2.js') > -1);
-  t.truthy(result.indexOf('filename(with)[chars$]^that.must+be-escaped') > -1);
-  t.truthy(result.indexOf('a_dir') > -1);
+  t.truthy(result.includes('file1'));
+  t.truthy(result.includes('file2'));
+  t.truthy(result.includes('file1.js'));
+  t.truthy(result.includes('file2.js'));
+  t.truthy(result.includes('filename(with)[chars$]^that.must+be-escaped'));
+  t.truthy(result.includes('a_dir'));
   t.is(result.length, 6);
 });
 
 test('simple arg', t => {
-  const result = shell.ls('resources/ls');
+  const result = shell.ls('test/resources/ls');
   t.falsy(shell.error());
   t.is(result.code, 0);
-  t.truthy(result.indexOf('file1') > -1);
-  t.truthy(result.indexOf('file2') > -1);
-  t.truthy(result.indexOf('file1.js') > -1);
-  t.truthy(result.indexOf('file2.js') > -1);
-  t.truthy(result.indexOf('filename(with)[chars$]^that.must+be-escaped') > -1);
-  t.truthy(result.indexOf('a_dir') > -1);
+  t.truthy(result.includes('file1'));
+  t.truthy(result.includes('file2'));
+  t.truthy(result.includes('file1.js'));
+  t.truthy(result.includes('file2.js'));
+  t.truthy(result.includes('filename(with)[chars$]^that.must+be-escaped'));
+  t.truthy(result.includes('a_dir'));
   t.is(result.length, 6);
 });
 
 test('simple arg, with a trailing slash', t => {
-  const result = shell.ls('resources/ls/');
+  const result = shell.ls('test/resources/ls/');
   t.falsy(shell.error());
   t.is(result.code, 0);
-  t.truthy(result.indexOf('file1') > -1);
-  t.truthy(result.indexOf('file2') > -1);
-  t.truthy(result.indexOf('file1.js') > -1);
-  t.truthy(result.indexOf('file2.js') > -1);
-  t.truthy(result.indexOf('filename(with)[chars$]^that.must+be-escaped') > -1);
-  t.truthy(result.indexOf('a_dir') > -1);
+  t.truthy(result.includes('file1'));
+  t.truthy(result.includes('file2'));
+  t.truthy(result.includes('file1.js'));
+  t.truthy(result.includes('file2.js'));
+  t.truthy(result.includes('filename(with)[chars$]^that.must+be-escaped'));
+  t.truthy(result.includes('a_dir'));
   t.is(result.length, 6);
 });
 
+test('simple arg, a file', t => {
+  const result = shell.ls('test/resources/ls/file1');
+  t.falsy(shell.error());
+  t.is(result.code, 0);
+  t.truthy(result.includes('test/resources/ls/file1'));
+  t.is(result.length, 1);
+});
+
 test('no args, -A option', t => {
-  shell.cd('resources/ls');
+  shell.cd('test/resources/ls');
   const result = shell.ls('-A');
   t.falsy(shell.error());
   t.is(result.code, 0);
-  t.truthy(result.indexOf('file1') > -1);
-  t.truthy(result.indexOf('file2') > -1);
-  t.truthy(result.indexOf('file1.js') > -1);
-  t.truthy(result.indexOf('file2.js') > -1);
-  t.truthy(result.indexOf('filename(with)[chars$]^that.must+be-escaped') > -1);
-  t.truthy(result.indexOf('a_dir') > -1);
-  t.truthy(result.indexOf('.hidden_file') > -1);
-  t.truthy(result.indexOf('.hidden_dir') > -1);
+  t.truthy(result.includes('file1'));
+  t.truthy(result.includes('file2'));
+  t.truthy(result.includes('file1.js'));
+  t.truthy(result.includes('file2.js'));
+  t.truthy(result.includes('filename(with)[chars$]^that.must+be-escaped'));
+  t.truthy(result.includes('a_dir'));
+  t.truthy(result.includes('.hidden_file'));
+  t.truthy(result.includes('.hidden_dir'));
   t.is(result.length, 8);
 });
 
 test('no args, deprecated -a option', t => {
-  shell.cd('resources/ls');
+  shell.cd('test/resources/ls');
   const result = shell.ls('-a'); // (deprecated) backwards compatibility test
   t.falsy(shell.error());
   t.is(result.code, 0);
-  t.truthy(result.indexOf('file1') > -1);
-  t.truthy(result.indexOf('file2') > -1);
-  t.truthy(result.indexOf('file1.js') > -1);
-  t.truthy(result.indexOf('file2.js') > -1);
-  t.truthy(result.indexOf('filename(with)[chars$]^that.must+be-escaped') > -1);
-  t.truthy(result.indexOf('a_dir') > -1);
-  t.truthy(result.indexOf('.hidden_file') > -1);
-  t.truthy(result.indexOf('.hidden_dir') > -1);
+  t.truthy(result.includes('file1'));
+  t.truthy(result.includes('file2'));
+  t.truthy(result.includes('file1.js'));
+  t.truthy(result.includes('file2.js'));
+  t.truthy(result.includes('filename(with)[chars$]^that.must+be-escaped'));
+  t.truthy(result.includes('a_dir'));
+  t.truthy(result.includes('.hidden_file'));
+  t.truthy(result.includes('.hidden_dir'));
   t.is(result.length, 8);
 });
 
 test('wildcard, very simple', t => {
-  const result = shell.ls('resources/cat/*');
+  const result = shell.ls('test/resources/cat/*');
   t.falsy(shell.error());
   t.is(result.code, 0);
-  t.truthy(result.indexOf('resources/cat/file1') > -1);
-  t.truthy(result.indexOf('resources/cat/file2') > -1);
-  t.is(result.length, 2);
+  t.truthy(result.includes('test/resources/cat/file1'));
+  t.truthy(result.includes('test/resources/cat/file2'));
+  t.truthy(result.includes('test/resources/cat/file3'));
+  t.truthy(result.includes('test/resources/cat/file4'));
+  t.truthy(result.includes('test/resources/cat/file5'));
+  t.is(result.length, 5);
 });
 
 test('wildcard, simple', t => {
-  const result = shell.ls('resources/ls/*');
+  const result = shell.ls('test/resources/ls/*');
   t.falsy(shell.error());
   t.is(result.code, 0);
-  t.truthy(result.indexOf('resources/ls/file1') > -1);
-  t.truthy(result.indexOf('resources/ls/file2') > -1);
-  t.truthy(result.indexOf('resources/ls/file1.js') > -1);
-  t.truthy(result.indexOf('resources/ls/file2.js') > -1);
+  t.truthy(result.includes('test/resources/ls/file1'));
+  t.truthy(result.includes('test/resources/ls/file2'));
+  t.truthy(result.includes('test/resources/ls/file1.js'));
+  t.truthy(result.includes('test/resources/ls/file2.js'));
   t.truthy(
-    result.indexOf('resources/ls/filename(with)[chars$]^that.must+be-escaped') > -1
+    result.includes('test/resources/ls/filename(with)[chars$]^that.must+be-escaped')
   );
-  t.is(result.indexOf('resources/ls/a_dir'), -1); // this shouldn't be there
-  t.truthy(result.indexOf('nada') > -1);
-  t.truthy(result.indexOf('b_dir') > -1);
+  t.falsy(result.includes('test/resources/ls/a_dir')); // this shouldn't be there
+  t.truthy(result.includes('nada'));
+  t.truthy(result.includes('b_dir'));
   t.is(result.length, 7);
 });
 
 test('wildcard, simple, with -d', t => {
-  const result = shell.ls('-d', 'resources/ls/*');
+  const result = shell.ls('-d', 'test/resources/ls/*');
   t.falsy(shell.error());
   t.is(result.code, 0);
-  t.truthy(result.indexOf('resources/ls/file1') > -1);
-  t.truthy(result.indexOf('resources/ls/file2') > -1);
-  t.truthy(result.indexOf('resources/ls/file1.js') > -1);
-  t.truthy(result.indexOf('resources/ls/file2.js') > -1);
+  t.truthy(result.includes('test/resources/ls/file1'));
+  t.truthy(result.includes('test/resources/ls/file2'));
+  t.truthy(result.includes('test/resources/ls/file1.js'));
+  t.truthy(result.includes('test/resources/ls/file2.js'));
   t.truthy(
-    result.indexOf('resources/ls/filename(with)[chars$]^that.must+be-escaped') > -1
+    result.includes('test/resources/ls/filename(with)[chars$]^that.must+be-escaped')
   );
-  t.truthy(result.indexOf('resources/ls/a_dir') > -1);
+  t.truthy(result.includes('test/resources/ls/a_dir'));
   t.is(result.length, 6);
 });
 
 test('wildcard, hidden only', t => {
-  const result = shell.ls('-d', 'resources/ls/.*');
+  const result = shell.ls('-d', 'test/resources/ls/.*');
   t.falsy(shell.error());
   t.is(result.code, 0);
-  t.truthy(result.indexOf('resources/ls/.hidden_file') > -1);
-  t.truthy(result.indexOf('resources/ls/.hidden_dir') > -1);
+  t.truthy(result.includes('test/resources/ls/.hidden_file'));
+  t.truthy(result.includes('test/resources/ls/.hidden_dir'));
   t.is(result.length, 2);
 });
 
 test('wildcard, mid-file', t => {
-  const result = shell.ls('resources/ls/f*le*');
+  const result = shell.ls('test/resources/ls/f*le*');
   t.falsy(shell.error());
   t.is(result.code, 0);
   t.is(result.length, 5);
-  t.truthy(result.indexOf('resources/ls/file1') > -1);
-  t.truthy(result.indexOf('resources/ls/file2') > -1);
-  t.truthy(result.indexOf('resources/ls/file1.js') > -1);
-  t.truthy(result.indexOf('resources/ls/file2.js') > -1);
+  t.truthy(result.includes('test/resources/ls/file1'));
+  t.truthy(result.includes('test/resources/ls/file2'));
+  t.truthy(result.includes('test/resources/ls/file1.js'));
+  t.truthy(result.includes('test/resources/ls/file2.js'));
   t.truthy(
-    result.indexOf('resources/ls/filename(with)[chars$]^that.must+be-escaped') > -1
+    result.includes('test/resources/ls/filename(with)[chars$]^that.must+be-escaped')
   );
 });
 
 test('wildcard, mid-file with dot (should escape dot for regex)', t => {
-  const result = shell.ls('resources/ls/f*le*.js');
+  const result = shell.ls('test/resources/ls/f*le*.js');
   t.falsy(shell.error());
   t.is(result.code, 0);
   t.is(result.length, 2);
-  t.truthy(result.indexOf('resources/ls/file1.js') > -1);
-  t.truthy(result.indexOf('resources/ls/file2.js') > -1);
+  t.truthy(result.includes('test/resources/ls/file1.js'));
+  t.truthy(result.includes('test/resources/ls/file2.js'));
 });
 
-test('one file that exists, one that doesn\'t', t => {
-  const result = shell.ls('resources/ls/file1.js', 'resources/ls/thisdoesntexist');
+test("one file that exists, one that doesn't", t => {
+  const result = shell.ls('test/resources/ls/file1.js', 'test/resources/ls/thisdoesntexist');
   t.truthy(shell.error());
   t.is(result.code, 2);
   t.is(result.length, 1);
-  t.truthy(result.indexOf('resources/ls/file1.js') > -1);
+  t.truthy(result.includes('test/resources/ls/file1.js'));
 });
 
-test('one file that exists, one that doesn\'t (other order)', t => {
-  const result = shell.ls('resources/ls/thisdoesntexist', 'resources/ls/file1.js');
+test("one file that exists, one that doesn't (other order)", t => {
+  const result = shell.ls('test/resources/ls/thisdoesntexist', 'test/resources/ls/file1.js');
   t.truthy(shell.error());
   t.is(result.code, 2);
   t.is(result.length, 1);
-  t.truthy(result.indexOf('resources/ls/file1.js') > -1);
+  t.truthy(result.includes('test/resources/ls/file1.js'));
 });
 
 test('wildcard, should not do partial matches', t => {
-  const result = shell.ls('resources/ls/*.j'); // shouldn't get .js
+  const result = shell.ls('test/resources/ls/*.j'); // shouldn't get .js
   t.truthy(shell.error());
   t.is(result.code, 2);
   t.is(result.length, 0);
 });
 
 test('wildcard, all files with extension', t => {
-  const result = shell.ls('resources/ls/*.*');
+  const result = shell.ls('test/resources/ls/*.*');
   t.falsy(shell.error());
   t.is(result.code, 0);
   t.is(result.length, 3);
-  t.truthy(result.indexOf('resources/ls/file1.js') > -1);
-  t.truthy(result.indexOf('resources/ls/file2.js') > -1);
+  t.truthy(result.includes('test/resources/ls/file1.js'));
+  t.truthy(result.includes('test/resources/ls/file2.js'));
   t.truthy(
-    result.indexOf('resources/ls/filename(with)[chars$]^that.must+be-escaped') > -1
+    result.includes('test/resources/ls/filename(with)[chars$]^that.must+be-escaped')
   );
 });
 
 test('wildcard, with additional path', t => {
-  const result = shell.ls('resources/ls/f*le*.js', 'resources/ls/a_dir');
+  const result = shell.ls('test/resources/ls/f*le*.js', 'test/resources/ls/a_dir');
   t.falsy(shell.error());
   t.is(result.code, 0);
   t.is(result.length, 4);
-  t.truthy(result.indexOf('resources/ls/file1.js') > -1);
-  t.truthy(result.indexOf('resources/ls/file2.js') > -1);
-  t.truthy(result.indexOf('b_dir') > -1); // no wildcard == no path prefix
-  t.truthy(result.indexOf('nada') > -1); // no wildcard == no path prefix
+  t.truthy(result.includes('test/resources/ls/file1.js'));
+  t.truthy(result.includes('test/resources/ls/file2.js'));
+  t.truthy(result.includes('b_dir')); // no wildcard == no path prefix
+  t.truthy(result.includes('nada')); // no wildcard == no path prefix
 });
 
 test('wildcard for both paths', t => {
-  const result = shell.ls('resources/ls/f*le*.js', 'resources/ls/a_dir/*');
+  const result = shell.ls('test/resources/ls/f*le*.js', 'test/resources/ls/a_dir/*');
   t.falsy(shell.error());
   t.is(result.code, 0);
   t.is(result.length, 4);
-  t.truthy(result.indexOf('resources/ls/file1.js') > -1);
-  t.truthy(result.indexOf('resources/ls/file2.js') > -1);
-  t.truthy(result.indexOf('z') > -1);
-  t.truthy(result.indexOf('resources/ls/a_dir/nada') > -1);
+  t.truthy(result.includes('test/resources/ls/file1.js'));
+  t.truthy(result.includes('test/resources/ls/file2.js'));
+  t.truthy(result.includes('z'));
+  t.truthy(result.includes('test/resources/ls/a_dir/nada'));
 });
 
 test('wildcard for both paths, array', t => {
-  const result = shell.ls(['resources/ls/f*le*.js', 'resources/ls/a_dir/*']);
+  const result = shell.ls(['test/resources/ls/f*le*.js', 'test/resources/ls/a_dir/*']);
   t.falsy(shell.error());
   t.is(result.code, 0);
   t.is(result.length, 4);
-  t.truthy(result.indexOf('resources/ls/file1.js') > -1);
-  t.truthy(result.indexOf('resources/ls/file2.js') > -1);
-  t.truthy(result.indexOf('z') > -1);
-  t.truthy(result.indexOf('resources/ls/a_dir/nada') > -1);
+  t.truthy(result.includes('test/resources/ls/file1.js'));
+  t.truthy(result.includes('test/resources/ls/file2.js'));
+  t.truthy(result.includes('z'));
+  t.truthy(result.includes('test/resources/ls/a_dir/nada'));
 });
 
 test('recursive, no path', t => {
-  shell.cd('resources/ls');
+  shell.cd('test/resources/ls');
   const result = shell.ls('-R');
   t.falsy(shell.error());
   t.is(result.code, 0);
-  t.truthy(result.indexOf('a_dir') > -1);
-  t.truthy(result.indexOf('a_dir/b_dir') > -1);
-  t.truthy(result.indexOf('a_dir/b_dir/z') > -1);
+  t.truthy(result.includes('a_dir'));
+  t.truthy(result.includes('a_dir/b_dir'));
+  t.truthy(result.includes('a_dir/b_dir/z'));
   t.is(result.length, 9);
 });
 
-test('recusive, path given', t => {
-  const result = shell.ls('-R', 'resources/ls');
+test('recursive, path given', t => {
+  const result = shell.ls('-R', 'test/resources/ls');
   t.falsy(shell.error());
   t.is(result.code, 0);
-  t.truthy(result.indexOf('a_dir') > -1);
-  t.truthy(result.indexOf('a_dir/b_dir') > -1);
-  t.truthy(result.indexOf('a_dir/b_dir/z') > -1);
+  t.truthy(result.includes('a_dir'));
+  t.truthy(result.includes('a_dir/b_dir'));
+  t.truthy(result.includes('a_dir/b_dir/z'));
   t.is(result.length, 9);
 });
 
 test('-RA flag, path given', t => {
-  const result = shell.ls('-RA', 'resources/ls');
+  const result = shell.ls('-RA', 'test/resources/ls');
   t.falsy(shell.error());
   t.is(result.code, 0);
-  t.truthy(result.indexOf('a_dir') > -1);
-  t.truthy(result.indexOf('a_dir/b_dir') > -1);
-  t.truthy(result.indexOf('a_dir/b_dir/z') > -1);
-  t.truthy(result.indexOf('a_dir/.hidden_dir/nada') > -1);
+  t.truthy(result.includes('a_dir'));
+  t.truthy(result.includes('a_dir/b_dir'));
+  t.truthy(result.includes('a_dir/b_dir/z'));
+  t.truthy(result.includes('a_dir/.hidden_dir/nada'));
   t.is(result.length, 14);
 });
 
-test('recursive, wildcard', t => {
-  const result = shell.ls('-R', 'resources/ls');
+test('-RA flag, symlinks are not followed', t => {
+  const result = shell.ls('-RA', 'test/resources/rm');
   t.falsy(shell.error());
   t.is(result.code, 0);
-  t.truthy(result.indexOf('a_dir') > -1);
-  t.truthy(result.indexOf('a_dir/b_dir') > -1);
-  t.truthy(result.indexOf('a_dir/b_dir/z') > -1);
-  t.is(result.length, 9);
+  t.truthy(result.includes('a_dir'));
+  t.truthy(result.includes('a_dir/a_file'));
+  t.truthy(result.includes('link_to_a_dir'));
+  t.falsy(result.includes('link_to_a_dir/a_file'));
+  t.truthy(result.includes('fake.lnk'));
+  t.is(result.length, 4);
+});
+
+test('-RAL flag, follows symlinks', t => {
+  utils.skipOnWin(t, () => {
+    const result = shell.ls('-RAL', 'test/resources/rm');
+    t.falsy(shell.error());
+    t.is(result.code, 0);
+    t.truthy(result.includes('a_dir'));
+    t.truthy(result.includes('a_dir/a_file'));
+    t.truthy(result.includes('link_to_a_dir'));
+    t.truthy(result.includes('link_to_a_dir/a_file'));
+    t.truthy(result.includes('fake.lnk'));
+    t.is(result.length, 5);
+  });
+});
+
+test('-L flag, path is symlink', t => {
+  utils.skipOnWin(t, () => {
+    const result = shell.ls('-L', 'test/resources/rm/link_to_a_dir');
+    t.falsy(shell.error());
+    t.is(result.code, 0);
+    t.truthy(result.includes('a_file'));
+    t.is(result.length, 1);
+  });
+});
+
+test('follow links to directories by default', t => {
+  utils.skipOnWin(t, () => {
+    const result = shell.ls('test/resources/rm/link_to_a_dir');
+    t.falsy(shell.error());
+    t.is(result.code, 0);
+    t.truthy(result.includes('a_file'));
+    t.is(result.length, 1);
+  });
 });
 
 test('-Rd works like -d', t => {
-  const result = shell.ls('-Rd', 'resources/ls');
+  const result = shell.ls('-Rd', 'test/resources/ls');
   t.falsy(shell.error());
   t.is(result.length, 1);
 });
 
 test('directory option, single arg', t => {
-  const result = shell.ls('-d', 'resources/ls');
+  const result = shell.ls('-d', 'test/resources/ls');
   t.falsy(shell.error());
   t.is(result.code, 0);
   t.is(result.length, 1);
 });
 
-test('directory option, single arg with trailing \'/\'', t => {
-  const result = shell.ls('-d', 'resources/ls/');
+test("directory option, single arg with trailing '/'", t => {
+  const result = shell.ls('-d', 'test/resources/ls/');
   t.falsy(shell.error());
   t.is(result.code, 0);
   t.is(result.length, 1);
 });
 
 test('directory option, multiple args', t => {
-  const result = shell.ls('-d', 'resources/ls/a_dir', 'resources/ls/file1');
+  const result = shell.ls('-d', 'test/resources/ls/a_dir', 'test/resources/ls/file1');
   t.falsy(shell.error());
   t.is(result.code, 0);
-  t.truthy(result.indexOf('resources/ls/a_dir') > -1);
-  t.truthy(result.indexOf('resources/ls/file1') > -1);
+  t.truthy(result.includes('test/resources/ls/a_dir'));
+  t.truthy(result.includes('test/resources/ls/file1'));
   t.is(result.length, 2);
 });
 
 test('directory option, globbed arg', t => {
-  const result = shell.ls('-d', 'resources/ls/*');
+  const result = shell.ls('-d', 'test/resources/ls/*');
   t.falsy(shell.error());
   t.is(result.code, 0);
-  t.truthy(result.indexOf('resources/ls/a_dir') > -1);
-  t.truthy(result.indexOf('resources/ls/file1') > -1);
-  t.truthy(result.indexOf('resources/ls/file1.js') > -1);
-  t.truthy(result.indexOf('resources/ls/file2') > -1);
-  t.truthy(result.indexOf('resources/ls/file2.js') > -1);
-  t.truthy(result.indexOf('resources/ls/file2') > -1);
+  t.truthy(result.includes('test/resources/ls/a_dir'));
+  t.truthy(result.includes('test/resources/ls/file1'));
+  t.truthy(result.includes('test/resources/ls/file1.js'));
+  t.truthy(result.includes('test/resources/ls/file2'));
+  t.truthy(result.includes('test/resources/ls/file2.js'));
+  t.truthy(result.includes('test/resources/ls/file2'));
   t.truthy(
-    result.indexOf('resources/ls/filename(with)[chars$]^that.must+be-escaped') > -1
+    result.includes('test/resources/ls/filename(with)[chars$]^that.must+be-escaped')
   );
   t.is(result.length, 6);
 });
 
 test('long option, single file', t => {
-  let result = shell.ls('-l', 'resources/ls/file1');
+  let result = shell.ls('-l', 'test/resources/ls/file1');
   t.is(result.length, 1);
   result = result[0];
   t.falsy(shell.error());
@@ -356,8 +405,10 @@ test('long option, single file', t => {
   t.is(result.nlink, 1);
   t.is(result.size, 5);
   t.truthy(result.mode); // check that these keys exist
-  t.truthy(process.platform === 'win32' || result.uid); // only on unix
-  t.truthy(process.platform === 'win32' || result.gid); // only on unix
+  utils.skipOnWin(t, () => {
+    t.truthy(result.uid);
+    t.truthy(result.gid);
+  });
   t.truthy(result.mtime); // check that these keys exist
   t.truthy(result.atime); // check that these keys exist
   t.truthy(result.ctime); // check that these keys exist
@@ -365,7 +416,7 @@ test('long option, single file', t => {
 });
 
 test('long option, glob files', t => {
-  let result = shell.ls('-l', 'resources/ls/f*le1');
+  let result = shell.ls('-l', 'test/resources/ls/f*le1');
   t.is(result.length, 1);
   result = result[0];
   t.falsy(shell.error());
@@ -373,8 +424,10 @@ test('long option, glob files', t => {
   t.is(result.nlink, 1);
   t.is(result.size, 5);
   t.truthy(result.mode); // check that these keys exist
-  t.truthy(process.platform === 'win32' || result.uid); // only on unix
-  t.truthy(process.platform === 'win32' || result.gid); // only on unix
+  utils.skipOnWin(t, () => {
+    t.truthy(result.uid);
+    t.truthy(result.gid);
+  });
   t.truthy(result.mtime); // check that these keys exist
   t.truthy(result.atime); // check that these keys exist
   t.truthy(result.ctime); // check that these keys exist
@@ -382,7 +435,7 @@ test('long option, glob files', t => {
 });
 
 test('long option, directory', t => {
-  let result = shell.ls('-l', 'resources/ls');
+  let result = shell.ls('-l', 'test/resources/ls');
   t.falsy(shell.error());
   t.is(result.code, 0);
   const idx = result.map(r => r.name).indexOf('file1');
@@ -393,8 +446,10 @@ test('long option, directory', t => {
   t.is(result.nlink, 1);
   t.is(result.size, 5);
   t.truthy(result.mode); // check that these keys exist
-  t.truthy(process.platform === 'win32' || result.uid); // only on unix
-  t.truthy(process.platform === 'win32' || result.gid); // only on unix
+  utils.skipOnWin(t, () => {
+    t.truthy(result.uid);
+    t.truthy(result.gid);
+  });
   t.truthy(result.mtime); // check that these keys exist
   t.truthy(result.atime); // check that these keys exist
   t.truthy(result.ctime); // check that these keys exist
@@ -402,7 +457,7 @@ test('long option, directory', t => {
 });
 
 test('long option, directory, recursive (and windows converts slashes)', t => {
-  let result = shell.ls('-lR', 'resources/ls/');
+  let result = shell.ls('-lR', 'test/resources/ls/');
   t.falsy(shell.error());
   t.is(result.code, 0);
   const idx = result.map(r => r.name).indexOf('a_dir/b_dir');
@@ -410,12 +465,14 @@ test('long option, directory, recursive (and windows converts slashes)', t => {
   t.truthy(idx >= 0);
   result = result[idx];
   t.is(result.name, result.name);
-  t.truthy(fs.statSync('resources/ls/a_dir/b_dir').isDirectory());
-  t.truthy(typeof result.nlink === 'number'); // This can vary between the local machine and travis
-  t.truthy(typeof result.size === 'number'); // This can vary between different file systems
+  t.truthy(common.statFollowLinks('test/resources/ls/a_dir/b_dir').isDirectory());
+  t.is(typeof result.nlink, 'number'); // This can vary between the local machine and travis
+  t.is(typeof result.size, 'number'); // This can vary between different file systems
   t.truthy(result.mode); // check that these keys exist
-  t.truthy(process.platform === 'win32' || result.uid); // only on unix
-  t.truthy(process.platform === 'win32' || result.gid); // only on unix
+  utils.skipOnWin(t, () => {
+    t.truthy(result.uid);
+    t.truthy(result.gid);
+  });
   t.truthy(result.mtime); // check that these keys exist
   t.truthy(result.atime); // check that these keys exist
   t.truthy(result.ctime); // check that these keys exist
@@ -423,25 +480,25 @@ test('long option, directory, recursive (and windows converts slashes)', t => {
 });
 
 test('still lists broken links', t => {
-  const result = shell.ls('resources/badlink');
+  const result = shell.ls('test/resources/badlink');
   t.falsy(shell.error());
   t.is(result.code, 0);
-  t.truthy(result.indexOf('resources/badlink') > -1);
+  t.truthy(result.includes('test/resources/badlink'));
   t.is(result.length, 1);
 });
 
 test('Test new ShellString-like attributes', t => {
-  const result = shell.ls('resources/ls');
+  const result = shell.ls('test/resources/ls');
   t.falsy(shell.error());
   t.is(result.code, 0);
-  t.truthy(result.stdout.indexOf('file1') > -1);
-  t.truthy(result.stdout.indexOf('file2') > -1);
-  t.truthy(result.stdout.indexOf('file1.js') > -1);
-  t.truthy(result.stdout.indexOf('file2.js') > -1);
+  t.truthy(result.stdout.includes('file1'));
+  t.truthy(result.stdout.includes('file2'));
+  t.truthy(result.stdout.includes('file1.js'));
+  t.truthy(result.stdout.includes('file2.js'));
   t.truthy(
-    result.stdout.indexOf('filename(with)[chars$]^that.must+be-escaped') > -1
+    result.stdout.includes('filename(with)[chars$]^that.must+be-escaped')
   );
-  t.truthy(result.stdout.indexOf('a_dir') > -1);
+  t.truthy(result.stdout.includes('a_dir'));
   t.is(typeof result.stdout, 'string');
   t.truthy(result.to);
   t.truthy(result.toEnd);
@@ -462,17 +519,17 @@ test('No trailing newline for ls() on empty directories', t => {
 
 test('Check stderr field', t => {
   t.falsy(fs.existsSync('/asdfasdf')); // sanity check
-  const result = shell.ls('resources/ls/file1', '/asdfasdf');
+  const result = shell.ls('test/resources/ls/file1', '/asdfasdf');
   t.truthy(shell.error());
   t.is('ls: no such file or directory: /asdfasdf', result.stderr);
 });
 
 test('non-normalized paths are still ok with -R', t => {
-  const result = shell.ls('-R', 'resources/./ls/../ls');
+  const result = shell.ls('-R', 'test/resources/./ls/../ls');
   t.falsy(shell.error());
   t.is(result.code, 0);
-  t.truthy(result.indexOf('a_dir') > -1);
-  t.truthy(result.indexOf('a_dir/b_dir') > -1);
-  t.truthy(result.indexOf('a_dir/b_dir/z') > -1);
+  t.truthy(result.includes('a_dir'));
+  t.truthy(result.includes('a_dir/b_dir'));
+  t.truthy(result.includes('a_dir/b_dir/z'));
   t.is(result.length, 9);
 });
diff --git a/test/mkdir.js b/test/mkdir.js
index 9c0c57e0d..f37b9f047 100644
--- a/test/mkdir.js
+++ b/test/mkdir.js
@@ -1,9 +1,10 @@
-import fs from 'fs';
+const fs = require('fs');
 
-import test from 'ava';
+const test = require('ava');
 
-import shell from '..';
-import utils from './utils/utils';
+const shell = require('..');
+const common = require('../src/common');
+const utils = require('./utils/utils');
 
 test.beforeEach(t => {
   t.context.tmp = utils.getTempDir();
@@ -28,21 +29,21 @@ test('no args', t => {
 });
 
 test('dir already exists', t => {
-  const mtime = fs.statSync(t.context.tmp).mtime.toString();
+  const mtime = common.statFollowLinks(t.context.tmp).mtime.toString();
   const result = shell.mkdir(t.context.tmp); // dir already exists
   t.truthy(shell.error());
   t.is(result.code, 1);
   t.is(result.stderr, `mkdir: path already exists: ${t.context.tmp}`);
-  t.is(fs.statSync(t.context.tmp).mtime.toString(), mtime); // didn't mess with dir
+  t.is(common.statFollowLinks(t.context.tmp).mtime.toString(), mtime); // didn't mess with dir
 });
 
-test('Can\'t overwrite a broken link', t => {
-  const mtime = fs.lstatSync('resources/badlink').mtime.toString();
-  const result = shell.mkdir('resources/badlink');
+test("Can't overwrite a broken link", t => {
+  const mtime = common.statNoFollowLinks('test/resources/badlink').mtime.toString();
+  const result = shell.mkdir('test/resources/badlink');
   t.truthy(shell.error());
   t.is(result.code, 1);
-  t.is(result.stderr, 'mkdir: path already exists: resources/badlink');
-  t.is(fs.lstatSync('resources/badlink').mtime.toString(), mtime); // didn't mess with file
+  t.is(result.stderr, 'mkdir: path already exists: test/resources/badlink');
+  t.is(common.statNoFollowLinks('test/resources/badlink').mtime.toString(), mtime); // didn't mess with file
 });
 
 test('root path does not exist', t => {
@@ -55,10 +56,38 @@ test('root path does not exist', t => {
   t.falsy(fs.existsSync('/asdfasdf/foobar'));
 });
 
+test('try to overwrite file', t => {
+  t.truthy(common.statFollowLinks('test/resources/file1').isFile());
+  const result = shell.mkdir('test/resources/file1');
+  t.truthy(shell.error());
+  t.is(result.code, 1);
+  t.is(result.stderr, 'mkdir: path already exists: test/resources/file1');
+  t.truthy(common.statFollowLinks('test/resources/file1').isFile());
+});
+
+test('try to overwrite file, with -p', t => {
+  t.truthy(common.statFollowLinks('test/resources/file1').isFile());
+  const result = shell.mkdir('-p', 'test/resources/file1');
+  t.truthy(shell.error());
+  t.is(result.code, 1);
+  t.is(result.stderr, 'mkdir: cannot create directory test/resources/file1: File exists');
+  t.truthy(common.statFollowLinks('test/resources/file1').isFile());
+});
+
+test('try to make a subdirectory of a file', t => {
+  t.truthy(common.statFollowLinks('test/resources/file1').isFile());
+  const result = shell.mkdir('test/resources/file1/subdir');
+  t.truthy(shell.error());
+  t.is(result.code, 1);
+  t.is(result.stderr, 'mkdir: cannot create directory test/resources/file1/subdir: Not a directory');
+  t.truthy(common.statFollowLinks('test/resources/file1').isFile());
+  t.falsy(fs.existsSync('test/resources/file1/subdir'));
+});
+
 test('Check for invalid permissions', t => {
-  if (process.platform !== 'win32') {
+  utils.skipOnWin(t, () => {
     // This test case only works on unix, but should work on Windows as well
-    const dirName = 'nowritedir';
+    const dirName = `${t.context.tmp}/nowritedir`;
     shell.mkdir(dirName);
     t.falsy(shell.error());
     shell.chmod('-w', dirName);
@@ -66,12 +95,11 @@ test('Check for invalid permissions', t => {
     t.is(result.code, 1);
     t.is(
       result.stderr,
-      'mkdir: cannot create directory nowritedir/foo: Permission denied'
+      `mkdir: cannot create directory ${t.context.tmp}/nowritedir/foo: Permission denied`
     );
     t.truthy(shell.error());
     t.falsy(fs.existsSync(dirName + '/foo'));
-    shell.rm('-rf', dirName); // clean up
-  }
+  });
 });
 
 //
@@ -113,10 +141,9 @@ test('-p flag', t => {
   t.falsy(shell.error());
   t.is(result.code, 0);
   t.truthy(fs.existsSync(`${t.context.tmp}/a/b/c`));
-  shell.rm('-Rf', `${t.context.tmp}/a`); // revert
 });
 
-test('multiple dirs', t => {
+test('-p flag: multiple dirs', t => {
   const result = shell.mkdir('-p', `${t.context.tmp}/zzza`,
     `${t.context.tmp}/zzzb`, `${t.context.tmp}/zzzc`);
   t.falsy(shell.error());
@@ -126,7 +153,7 @@ test('multiple dirs', t => {
   t.truthy(fs.existsSync(`${t.context.tmp}/zzzc`));
 });
 
-test('multiple dirs, array syntax', t => {
+test('-p flag: multiple dirs, array syntax', t => {
   const result = shell.mkdir('-p', [`${t.context.tmp}/yyya`,
     `${t.context.tmp}/yyyb`, `${t.context.tmp}/yyyc`]);
   t.falsy(shell.error());
@@ -136,6 +163,26 @@ test('multiple dirs, array syntax', t => {
   t.truthy(fs.existsSync(`${t.context.tmp}/yyyc`));
 });
 
+test('-p flag: subdirectory already exists', t => {
+  t.falsy(fs.existsSync(`${t.context.tmp}/d1`));
+  shell.mkdir('-p', `${t.context.tmp}/d1/d2/d3`);
+  t.truthy(fs.existsSync(`${t.context.tmp}/d1/d2/d3`));
+  const result = shell.mkdir('-p', `${t.context.tmp}/d1/d2`);
+  t.falsy(shell.error());
+  t.is(result.code, 0);
+  t.truthy(fs.existsSync(`${t.context.tmp}/d1/d2/d3`));
+});
+
+test('-p flag: create directory in subdirectory', t => {
+  t.falsy(fs.existsSync(`${t.context.tmp}/d1`));
+  shell.mkdir('-p', `${t.context.tmp}/d1/d2`);
+  t.truthy(fs.existsSync(`${t.context.tmp}/d1/d2`));
+  const result = shell.mkdir('-p', `${t.context.tmp}/d1/d2/d3`);
+  t.falsy(shell.error());
+  t.is(result.code, 0);
+  t.truthy(fs.existsSync(`${t.context.tmp}/d1/d2/d3`));
+});
+
 test('globbed dir', t => {
   let result = shell.mkdir('-p', `${t.context.tmp}/mydir`);
   t.falsy(shell.error());
diff --git a/test/mv.js b/test/mv.js
index dcf1e22f2..f6c34e6aa 100644
--- a/test/mv.js
+++ b/test/mv.js
@@ -1,9 +1,9 @@
-import fs from 'fs';
+const fs = require('fs');
 
-import test from 'ava';
+const test = require('ava');
 
-import shell from '..';
-import utils from './utils/utils';
+const shell = require('..');
+const utils = require('./utils/utils');
 
 const CWD = process.cwd();
 const numLines = utils.numLines;
@@ -11,7 +11,7 @@ const numLines = utils.numLines;
 test.beforeEach(t => {
   t.context.tmp = utils.getTempDir();
   shell.config.resetForTesting();
-  shell.cp('-r', 'resources', t.context.tmp);
+  shell.cp('-r', 'test/resources', t.context.tmp);
   shell.cd(t.context.tmp);
 });
 
@@ -91,6 +91,14 @@ test('-n is no-force/no-clobber', t => {
   t.is(result.stderr, 'mv: dest file already exists: file2');
 });
 
+test('-n option with a directory as the destination', t => {
+  shell.cp('file1', 'cp'); // copy it so we're sure it's already there
+  const result = shell.mv('-n', 'file1', 'cp');
+  t.truthy(shell.error());
+  t.is(result.code, 1);
+  t.is(result.stderr, 'mv: dest file already exists: cp/file1');
+});
+
 test('-f is the default behavior', t => {
   const result = shell.mv('file1', 'file2'); // dest already exists (but that's ok)
   t.falsy(shell.error());
@@ -113,7 +121,7 @@ test('too many sources (exist, but dest is file)', t => {
   t.is(result.stderr, 'mv: dest is not a directory (too many sources)');
 });
 
-test('can\'t use wildcard when dest is file', t => {
+test("can't use wildcard when dest is file", t => {
   const result = shell.mv('file*', 'file1');
   t.truthy(shell.error());
   t.truthy(fs.existsSync('file1'));
@@ -153,19 +161,13 @@ test('one source', t => {
 });
 
 test('two sources', t => {
-  shell.rm('-rf', 't');
-  shell.mkdir('-p', 't');
-  let result = shell.mv('file1', 'file2', 't');
+  const result = shell.mv('file1', 'file2', 'cp');
   t.falsy(shell.error());
   t.is(result.code, 0);
   t.falsy(fs.existsSync('file1'));
   t.falsy(fs.existsSync('file2'));
-  t.truthy(fs.existsSync('t/file1'));
-  t.truthy(fs.existsSync('t/file2'));
-  result = shell.mv('t/*', '.'); // revert
-  t.is(result.code, 0);
-  t.truthy(fs.existsSync('file1'));
-  t.truthy(fs.existsSync('file2'));
+  t.truthy(fs.existsSync('cp/file1'));
+  t.truthy(fs.existsSync('cp/file2'));
 });
 
 test('two sources, array style', t => {
@@ -204,3 +206,30 @@ test('dest exists, but -f given', t => {
   t.falsy(fs.existsSync('file1'));
   t.truthy(fs.existsSync('file2'));
 });
+
+test('should not overwrite recently created files', t => {
+  shell.mkdir('-p', 't');
+  const result = shell.mv('file1', 'cp/file1', 't/');
+  t.truthy(shell.error());
+  t.is(result.code, 1);
+
+  // Ensure First file is copied
+  t.is(shell.cat('t/file1').toString(), 'test1');
+  t.is(
+    result.stderr,
+    "mv: will not overwrite just-created 't/file1' with 'cp/file1'"
+  );
+  t.truthy(fs.existsSync('cp/file1'));
+});
+
+
+test('should not overwrite recently created files (not give error no-force mode)', t => {
+  shell.mkdir('-p', 't');
+  const result = shell.mv('-n', 'file1', 'cp/file1', 't/');
+  t.falsy(shell.error());
+  t.is(result.code, 0);
+
+  // Ensure First file is moved
+  t.is(shell.cat('t/file1').toString(), 'test1');
+  t.truthy(fs.existsSync('cp/file1'));
+});
diff --git a/test/pipe.js b/test/pipe.js
index dbb2cc5fd..a8aabb928 100644
--- a/test/pipe.js
+++ b/test/pipe.js
@@ -1,6 +1,6 @@
-import test from 'ava';
+const test = require('ava');
 
-import shell from '..';
+const shell = require('..');
 
 shell.config.silent = true;
 
@@ -9,8 +9,8 @@ shell.config.silent = true;
 //
 
 test('commands like `rm` cannot be on the right side of pipes', t => {
-  t.is(typeof shell.ls('.').rm, 'undefined');
-  t.is(typeof shell.cat('resources/file1.txt').rm, 'undefined');
+  t.is(shell.ls('.').rm, undefined);
+  t.is(shell.cat('test/resources/file1.txt').rm, undefined);
 });
 
 //
@@ -19,33 +19,33 @@ test('commands like `rm` cannot be on the right side of pipes', t => {
 
 test('piping to cat() should return roughly the same thing', t => {
   t.is(
-    shell.cat('resources/file1.txt').cat().toString(),
-    shell.cat('resources/file1.txt').toString()
+    shell.cat('test/resources/file1.txt').cat().toString(),
+    shell.cat('test/resources/file1.txt').toString()
   );
 });
 
 test('piping ls() into cat() converts to a string-like object', t => {
-  t.is(shell.ls('resources/').cat().toString(), shell.ls('resources/').stdout);
+  t.is(shell.ls('test/resources/').cat().toString(), shell.ls('test/resources/').stdout);
 });
 
 test('grep works in a pipe', t => {
-  const result = shell.ls('resources/').grep('file1');
+  const result = shell.ls('test/resources/').grep('file1');
   t.is(result.toString(), 'file1\nfile1.js\nfile1.txt\n');
 });
 
 test('multiple pipes work', t => {
-  const result = shell.ls('resources/').cat().grep('file1');
+  const result = shell.ls('test/resources/').cat().grep('file1');
   t.is(result.toString(), 'file1\nfile1.js\nfile1.txt\n');
 });
 
 test('Equivalent to a simple grep() test case', t => {
-  const result = shell.cat('resources/grep/file').grep(/alpha*beta/);
+  const result = shell.cat('test/resources/grep/file').grep(/alpha*beta/);
   t.falsy(shell.error());
   t.is(result.toString(), 'alphaaaaaaabeta\nalphbeta\n');
 });
 
 test('Equivalent to a simple sed() test case', t => {
-  const result = shell.cat('resources/grep/file').sed(/l*\.js/, '');
+  const result = shell.cat('test/resources/grep/file').sed(/l*\.js/, '');
   t.falsy(shell.error());
   t.is(
     result.toString(),
@@ -54,21 +54,27 @@ test('Equivalent to a simple sed() test case', t => {
 });
 
 test('Sort a file by frequency of each line', t => {
-  const result = shell.sort('resources/uniq/pipe').uniq('-c').sort('-n');
+  const result = shell.sort('test/resources/uniq/pipe').uniq('-c').sort('-n');
   t.falsy(shell.error());
-  t.is(result.toString(), shell.cat('resources/uniq/pipeSorted').toString());
+  t.is(result.toString(), shell.cat('test/resources/uniq/pipeSorted').toString());
 });
 
 test('Synchronous exec', t => {
-  const result = shell.cat('resources/grep/file').exec('shx grep "alpha*beta"');
+  const result = shell.cat('test/resources/grep/file').exec('shx grep "alpha*beta"');
   t.falsy(shell.error());
   t.is(result.toString(), 'alphaaaaaaabeta\nalphbeta\n');
 });
 
-test.cb('Asynchronous exec', t => {
-  shell.cat('resources/grep/file').exec('shx grep "alpha*beta"', (code, stdout) => {
-    t.is(code, 0);
-    t.is(stdout, 'alphaaaaaaabeta\nalphbeta\n');
-    t.end();
+test('Asynchronous exec', async t => {
+  const promise = new Promise(resolve => {
+    shell.cat('test/resources/grep/file')
+      .exec('shx grep "alpha*beta"', (code, stdout, stderr) => {
+        resolve({ code, stdout, stderr });
+      });
   });
+
+  const result = await promise;
+  t.is(result.code, 0);
+  t.is(result.stdout, 'alphaaaaaaabeta\nalphbeta\n');
+  t.is(result.stderr, '');
 });
diff --git a/test/plugin.js b/test/plugin.js
index 7b7594bfd..59626c1c0 100644
--- a/test/plugin.js
+++ b/test/plugin.js
@@ -1,8 +1,8 @@
-import test from 'ava';
+const test = require('ava');
 
 // This is the supported order for importing these files
-import plugin from '../plugin';
-import shell from '..';
+const plugin = require('../plugin');
+const shell = require('..');
 
 let data = 0;
 let fname;
@@ -39,6 +39,25 @@ test.beforeEach(() => {
   shell.config.resetForTesting();
 });
 
+//
+// Invalids
+//
+
+test('Unable to register a plugin with unknown options', t => {
+  t.throws(() => {
+    plugin.register('foo', fooImplementation, {
+      foobar: true,
+    });
+  }, { instanceOf: Error });
+});
+
+test('Unable to register a plugin with wrong option types', t => {
+  t.throws(() => {
+    plugin.register('foo', fooImplementation, {
+      wrapOutput: 'true', // should be a boolean
+    });
+  }, { instanceOf: TypeError });
+});
 
 //
 // Valids
@@ -51,7 +70,7 @@ test('All plugin utils exist', t => {
   t.is(typeof plugin.register, 'function');
 });
 
-test('The plugin does not exist before it\'s registered', t => {
+test("The plugin does not exist before it's registered", t => {
   t.falsy(shell.foo);
 });
 
@@ -95,9 +114,9 @@ test('The command parses options', t => {
 });
 
 test('The command supports globbing by default', t => {
-  shell.foo('-f', 're*u?ces');
+  shell.foo('-f', 'test/re*u?ces');
   t.is(data, 12);
-  t.is(fname, 'resources');
+  t.is(fname, 'test/resources');
 });
 
 test('Plugins are also compatible with shelljs/global', t => {
@@ -139,10 +158,10 @@ test('Plugins can continue from errors', t => {
   t.is(shell.error(), 'foo: Error, but continuing');
 });
 
-test('Cannot overwrite an existing command by default', t => {
+test('Cannot overwrite an existing command', t => {
   const oldCat = shell.cat;
   t.throws(() => {
     plugin.register('cat', fooImplementation);
-  }, 'unable to overwrite `cat` command');
+  }, { message: 'Command `cat` already exists' });
   t.is(shell.cat, oldCat);
 });
diff --git a/test/popd.js b/test/popd.js
index 0ac1447c8..e02880b75 100644
--- a/test/popd.js
+++ b/test/popd.js
@@ -1,8 +1,9 @@
-import path from 'path';
+const path = require('path');
 
-import test from 'ava';
+const test = require('ava');
 
-import shell from '..';
+const shell = require('..');
+const mocks = require('./utils/mocks');
 
 const rootDir = path.resolve();
 
@@ -26,7 +27,7 @@ test.after.always(() => {
 //
 
 test('basic usage', t => {
-  shell.pushd('resources/pushd');
+  shell.pushd('test/resources/pushd');
   const trail = shell.popd();
   t.falsy(shell.error());
   t.is(process.cwd(), trail[0]);
@@ -34,33 +35,33 @@ test('basic usage', t => {
 });
 
 test('two directories on the stack', t => {
-  shell.pushd('resources/pushd');
+  shell.pushd('test/resources/pushd');
   shell.pushd('a');
   const trail = shell.popd();
   t.falsy(shell.error());
   t.is(process.cwd(), trail[0]);
   t.deepEqual(trail, [
-    path.resolve(rootDir, 'resources/pushd'),
+    path.resolve(rootDir, 'test/resources/pushd'),
     rootDir,
   ]);
 });
 
 test('three directories on the stack', t => {
-  shell.pushd('resources/pushd');
+  shell.pushd('test/resources/pushd');
   shell.pushd('b');
   shell.pushd('c');
   const trail = shell.popd();
   t.falsy(shell.error());
   t.is(process.cwd(), trail[0]);
   t.deepEqual(trail, [
-    path.resolve(rootDir, 'resources/pushd/b'),
-    path.resolve(rootDir, 'resources/pushd'),
+    path.resolve(rootDir, 'test/resources/pushd/b'),
+    path.resolve(rootDir, 'test/resources/pushd'),
     rootDir,
   ]);
 });
 
 test('Valid by index', t => {
-  shell.pushd('resources/pushd');
+  shell.pushd('test/resources/pushd');
   const trail = shell.popd('+0');
   t.falsy(shell.error());
   t.is(process.cwd(), trail[0]);
@@ -68,23 +69,23 @@ test('Valid by index', t => {
 });
 
 test('Using +1 option', t => {
-  shell.pushd('resources/pushd');
+  shell.pushd('test/resources/pushd');
   const trail = shell.popd('+1');
   t.falsy(shell.error());
   t.is(process.cwd(), trail[0]);
-  t.deepEqual(trail, [path.resolve(rootDir, 'resources/pushd')]);
+  t.deepEqual(trail, [path.resolve(rootDir, 'test/resources/pushd')]);
 });
 
 test('Using -0 option', t => {
-  shell.pushd('resources/pushd');
+  shell.pushd('test/resources/pushd');
   const trail = shell.popd('-0');
   t.falsy(shell.error());
   t.is(process.cwd(), trail[0]);
-  t.deepEqual(trail, [path.resolve(rootDir, 'resources/pushd')]);
+  t.deepEqual(trail, [path.resolve(rootDir, 'test/resources/pushd')]);
 });
 
 test('Using -1 option', t => {
-  shell.pushd('resources/pushd');
+  shell.pushd('test/resources/pushd');
   const trail = shell.popd('-1');
   t.falsy(shell.error());
   t.is(process.cwd(), trail[0]);
@@ -92,11 +93,11 @@ test('Using -1 option', t => {
 });
 
 test('Using -n option', t => {
-  shell.pushd('resources/pushd');
+  shell.pushd('test/resources/pushd');
   const trail = shell.popd('-n');
   t.falsy(shell.error());
   t.is(process.cwd(), trail[0]);
-  t.deepEqual(trail, [path.resolve(rootDir, 'resources/pushd')]);
+  t.deepEqual(trail, [path.resolve(rootDir, 'test/resources/pushd')]);
 });
 
 test('Popping an empty stack', t => {
@@ -105,12 +106,54 @@ test('Popping an empty stack', t => {
 });
 
 test('Test that rootDir is not stored', t => {
-  shell.cd('resources/pushd');
+  shell.cd('test/resources/pushd');
   shell.pushd('b');
   const trail = shell.popd();
   t.falsy(shell.error());
-  t.is(trail[0], path.resolve(rootDir, 'resources/pushd'));
+  t.is(trail[0], path.resolve(rootDir, 'test/resources/pushd'));
   t.is(process.cwd(), trail[0]);
   shell.popd(); // no more in the stack
   t.truthy(shell.error());
 });
+
+test('quiet mode off', t => {
+  try {
+    shell.pushd('test/resources/pushd');
+    shell.config.silent = false;
+    mocks.stdout.init();
+    mocks.stderr.init();
+    const trail = shell.popd();
+    const stdout = mocks.stdout.getValue();
+    const stderr = mocks.stderr.getValue();
+    t.falsy(shell.error());
+    t.is(stdout, '');
+    t.is(stderr, `${rootDir}\n`);
+    t.is(process.cwd(), trail[0]);
+    t.deepEqual(trail, [rootDir]);
+  } finally {
+    shell.config.silent = true;
+    mocks.stdout.restore();
+    mocks.stderr.restore();
+  }
+});
+
+test('quiet mode on', t => {
+  try {
+    shell.pushd('test/resources/pushd');
+    shell.config.silent = false;
+    mocks.stdout.init();
+    mocks.stderr.init();
+    const trail = shell.popd('-q');
+    const stdout = mocks.stdout.getValue();
+    const stderr = mocks.stderr.getValue();
+    t.falsy(shell.error());
+    t.is(stdout, '');
+    t.is(stderr, '');
+    t.is(process.cwd(), trail[0]);
+    t.deepEqual(trail, [rootDir]);
+  } finally {
+    shell.config.silent = true;
+    mocks.stdout.restore();
+    mocks.stderr.restore();
+  }
+});
diff --git a/test/pushd.js b/test/pushd.js
index 96bfe47ee..987dc093d 100644
--- a/test/pushd.js
+++ b/test/pushd.js
@@ -1,8 +1,9 @@
-import path from 'path';
+const path = require('path');
 
-import test from 'ava';
+const test = require('ava');
 
-import shell from '..';
+const shell = require('..');
+const mocks = require('./utils/mocks');
 
 const rootDir = path.resolve();
 
@@ -25,59 +26,59 @@ test.after.always(() => {
 //
 
 test('Push valid directories', t => {
-  const trail = shell.pushd('resources/pushd');
+  const trail = shell.pushd('test/resources/pushd');
   t.falsy(shell.error());
   t.is(process.cwd(), trail[0]);
   t.deepEqual(trail, [
-    path.resolve(rootDir, 'resources/pushd'),
+    path.resolve(rootDir, 'test/resources/pushd'),
     rootDir,
   ]);
 });
 
 test('Two directories', t => {
-  shell.pushd('resources/pushd');
+  shell.pushd('test/resources/pushd');
   const trail = shell.pushd('a');
   t.falsy(shell.error());
   t.is(process.cwd(), trail[0]);
   t.deepEqual(trail, [
-    path.resolve(rootDir, 'resources/pushd/a'),
-    path.resolve(rootDir, 'resources/pushd'),
+    path.resolve(rootDir, 'test/resources/pushd/a'),
+    path.resolve(rootDir, 'test/resources/pushd'),
     rootDir,
   ]);
 });
 
 test('Three directories', t => {
-  shell.pushd('resources/pushd');
+  shell.pushd('test/resources/pushd');
   shell.pushd('a');
   const trail = shell.pushd('../b');
   t.falsy(shell.error());
   t.is(process.cwd(), trail[0]);
   t.deepEqual(trail, [
-    path.resolve(rootDir, 'resources/pushd/b'),
-    path.resolve(rootDir, 'resources/pushd/a'),
-    path.resolve(rootDir, 'resources/pushd'),
+    path.resolve(rootDir, 'test/resources/pushd/b'),
+    path.resolve(rootDir, 'test/resources/pushd/a'),
+    path.resolve(rootDir, 'test/resources/pushd'),
     rootDir,
   ]);
 });
 
 test('Four directories', t => {
-  shell.pushd('resources/pushd');
+  shell.pushd('test/resources/pushd');
   shell.pushd('a');
   shell.pushd('../b');
   const trail = shell.pushd('c');
   t.falsy(shell.error());
   t.is(process.cwd(), trail[0]);
   t.deepEqual(trail, [
-    path.resolve(rootDir, 'resources/pushd/b/c'),
-    path.resolve(rootDir, 'resources/pushd/b'),
-    path.resolve(rootDir, 'resources/pushd/a'),
-    path.resolve(rootDir, 'resources/pushd'),
+    path.resolve(rootDir, 'test/resources/pushd/b/c'),
+    path.resolve(rootDir, 'test/resources/pushd/b'),
+    path.resolve(rootDir, 'test/resources/pushd/a'),
+    path.resolve(rootDir, 'test/resources/pushd'),
     rootDir,
   ]);
 });
 
 test('Push stuff around with positive indices', t => {
-  shell.pushd('resources/pushd');
+  shell.pushd('test/resources/pushd');
   shell.pushd('a');
   shell.pushd('../b');
   shell.pushd('c');
@@ -85,16 +86,16 @@ test('Push stuff around with positive indices', t => {
   t.falsy(shell.error());
   t.is(process.cwd(), trail[0]);
   t.deepEqual(trail, [
-    path.resolve(rootDir, 'resources/pushd/b/c'),
-    path.resolve(rootDir, 'resources/pushd/b'),
-    path.resolve(rootDir, 'resources/pushd/a'),
-    path.resolve(rootDir, 'resources/pushd'),
+    path.resolve(rootDir, 'test/resources/pushd/b/c'),
+    path.resolve(rootDir, 'test/resources/pushd/b'),
+    path.resolve(rootDir, 'test/resources/pushd/a'),
+    path.resolve(rootDir, 'test/resources/pushd'),
     rootDir,
   ]);
 });
 
 test('+1 option', t => {
-  shell.pushd('resources/pushd');
+  shell.pushd('test/resources/pushd');
   shell.pushd('a');
   shell.pushd('../b');
   shell.pushd('c');
@@ -102,16 +103,16 @@ test('+1 option', t => {
   t.falsy(shell.error());
   t.is(process.cwd(), trail[0]);
   t.deepEqual(trail, [
-    path.resolve(rootDir, 'resources/pushd/b'),
-    path.resolve(rootDir, 'resources/pushd/a'),
-    path.resolve(rootDir, 'resources/pushd'),
+    path.resolve(rootDir, 'test/resources/pushd/b'),
+    path.resolve(rootDir, 'test/resources/pushd/a'),
+    path.resolve(rootDir, 'test/resources/pushd'),
     rootDir,
-    path.resolve(rootDir, 'resources/pushd/b/c'),
+    path.resolve(rootDir, 'test/resources/pushd/b/c'),
   ]);
 });
 
 test('+2 option', t => {
-  shell.pushd('resources/pushd');
+  shell.pushd('test/resources/pushd');
   shell.pushd('a');
   shell.pushd('../b');
   shell.pushd('c');
@@ -119,16 +120,16 @@ test('+2 option', t => {
   t.falsy(shell.error());
   t.is(process.cwd(), trail[0]);
   t.deepEqual(trail, [
-    path.resolve(rootDir, 'resources/pushd/a'),
-    path.resolve(rootDir, 'resources/pushd'),
+    path.resolve(rootDir, 'test/resources/pushd/a'),
+    path.resolve(rootDir, 'test/resources/pushd'),
     rootDir,
-    path.resolve(rootDir, 'resources/pushd/b/c'),
-    path.resolve(rootDir, 'resources/pushd/b'),
+    path.resolve(rootDir, 'test/resources/pushd/b/c'),
+    path.resolve(rootDir, 'test/resources/pushd/b'),
   ]);
 });
 
 test('+3 option', t => {
-  shell.pushd('resources/pushd');
+  shell.pushd('test/resources/pushd');
   shell.pushd('a');
   shell.pushd('../b');
   shell.pushd('c');
@@ -136,16 +137,16 @@ test('+3 option', t => {
   t.falsy(shell.error());
   t.is(process.cwd(), trail[0]);
   t.deepEqual(trail, [
-    path.resolve(rootDir, 'resources/pushd'),
+    path.resolve(rootDir, 'test/resources/pushd'),
     rootDir,
-    path.resolve(rootDir, 'resources/pushd/b/c'),
-    path.resolve(rootDir, 'resources/pushd/b'),
-    path.resolve(rootDir, 'resources/pushd/a'),
+    path.resolve(rootDir, 'test/resources/pushd/b/c'),
+    path.resolve(rootDir, 'test/resources/pushd/b'),
+    path.resolve(rootDir, 'test/resources/pushd/a'),
   ]);
 });
 
 test('+4 option', t => {
-  shell.pushd('resources/pushd');
+  shell.pushd('test/resources/pushd');
   shell.pushd('a');
   shell.pushd('../b');
   shell.pushd('c');
@@ -154,15 +155,15 @@ test('+4 option', t => {
   t.is(process.cwd(), trail[0]);
   t.deepEqual(trail, [
     rootDir,
-    path.resolve(rootDir, 'resources/pushd/b/c'),
-    path.resolve(rootDir, 'resources/pushd/b'),
-    path.resolve(rootDir, 'resources/pushd/a'),
-    path.resolve(rootDir, 'resources/pushd'),
+    path.resolve(rootDir, 'test/resources/pushd/b/c'),
+    path.resolve(rootDir, 'test/resources/pushd/b'),
+    path.resolve(rootDir, 'test/resources/pushd/a'),
+    path.resolve(rootDir, 'test/resources/pushd'),
   ]);
 });
 
 test('Push stuff around with negative indices', t => {
-  shell.pushd('resources/pushd');
+  shell.pushd('test/resources/pushd');
   shell.pushd('a');
   shell.pushd('../b');
   shell.pushd('c');
@@ -171,15 +172,15 @@ test('Push stuff around with negative indices', t => {
   t.is(process.cwd(), trail[0]);
   t.deepEqual(trail, [
     rootDir,
-    path.resolve(rootDir, 'resources/pushd/b/c'),
-    path.resolve(rootDir, 'resources/pushd/b'),
-    path.resolve(rootDir, 'resources/pushd/a'),
-    path.resolve(rootDir, 'resources/pushd'),
+    path.resolve(rootDir, 'test/resources/pushd/b/c'),
+    path.resolve(rootDir, 'test/resources/pushd/b'),
+    path.resolve(rootDir, 'test/resources/pushd/a'),
+    path.resolve(rootDir, 'test/resources/pushd'),
   ]);
 });
 
 test('-1 option', t => {
-  shell.pushd('resources/pushd');
+  shell.pushd('test/resources/pushd');
   shell.pushd('a');
   shell.pushd('../b');
   shell.pushd('c');
@@ -187,16 +188,16 @@ test('-1 option', t => {
   t.falsy(shell.error());
   t.is(process.cwd(), trail[0]);
   t.deepEqual(trail, [
-    path.resolve(rootDir, 'resources/pushd'),
+    path.resolve(rootDir, 'test/resources/pushd'),
     rootDir,
-    path.resolve(rootDir, 'resources/pushd/b/c'),
-    path.resolve(rootDir, 'resources/pushd/b'),
-    path.resolve(rootDir, 'resources/pushd/a'),
+    path.resolve(rootDir, 'test/resources/pushd/b/c'),
+    path.resolve(rootDir, 'test/resources/pushd/b'),
+    path.resolve(rootDir, 'test/resources/pushd/a'),
   ]);
 });
 
 test('-2 option', t => {
-  shell.pushd('resources/pushd');
+  shell.pushd('test/resources/pushd');
   shell.pushd('a');
   shell.pushd('../b');
   shell.pushd('c');
@@ -204,16 +205,16 @@ test('-2 option', t => {
   t.falsy(shell.error());
   t.is(process.cwd(), trail[0]);
   t.deepEqual(trail, [
-    path.resolve(rootDir, 'resources/pushd/a'),
-    path.resolve(rootDir, 'resources/pushd'),
+    path.resolve(rootDir, 'test/resources/pushd/a'),
+    path.resolve(rootDir, 'test/resources/pushd'),
     rootDir,
-    path.resolve(rootDir, 'resources/pushd/b/c'),
-    path.resolve(rootDir, 'resources/pushd/b'),
+    path.resolve(rootDir, 'test/resources/pushd/b/c'),
+    path.resolve(rootDir, 'test/resources/pushd/b'),
   ]);
 });
 
 test('-3 option', t => {
-  shell.pushd('resources/pushd');
+  shell.pushd('test/resources/pushd');
   shell.pushd('a');
   shell.pushd('../b');
   shell.pushd('c');
@@ -221,16 +222,16 @@ test('-3 option', t => {
   t.falsy(shell.error());
   t.is(process.cwd(), trail[0]);
   t.deepEqual(trail, [
-    path.resolve(rootDir, 'resources/pushd/b'),
-    path.resolve(rootDir, 'resources/pushd/a'),
-    path.resolve(rootDir, 'resources/pushd'),
+    path.resolve(rootDir, 'test/resources/pushd/b'),
+    path.resolve(rootDir, 'test/resources/pushd/a'),
+    path.resolve(rootDir, 'test/resources/pushd'),
     rootDir,
-    path.resolve(rootDir, 'resources/pushd/b/c'),
+    path.resolve(rootDir, 'test/resources/pushd/b/c'),
   ]);
 });
 
 test('-4 option', t => {
-  shell.pushd('resources/pushd');
+  shell.pushd('test/resources/pushd');
   shell.pushd('a');
   shell.pushd('../b');
   shell.pushd('c');
@@ -238,33 +239,33 @@ test('-4 option', t => {
   t.falsy(shell.error());
   t.is(process.cwd(), trail[0]);
   t.deepEqual(trail, [
-    path.resolve(rootDir, 'resources/pushd/b/c'),
-    path.resolve(rootDir, 'resources/pushd/b'),
-    path.resolve(rootDir, 'resources/pushd/a'),
-    path.resolve(rootDir, 'resources/pushd'),
+    path.resolve(rootDir, 'test/resources/pushd/b/c'),
+    path.resolve(rootDir, 'test/resources/pushd/b'),
+    path.resolve(rootDir, 'test/resources/pushd/a'),
+    path.resolve(rootDir, 'test/resources/pushd'),
     rootDir,
   ]);
 });
 
 test('Push without changing directory or resolving paths', t => {
-  const trail = shell.pushd('-n', 'resources/pushd');
+  const trail = shell.pushd('-n', 'test/resources/pushd');
   t.falsy(shell.error());
   t.is(process.cwd(), trail[0]);
   t.deepEqual(trail, [
     rootDir,
-    'resources/pushd',
+    'test/resources/pushd',
   ]);
 });
 
 test('Using the -n option with a non-empty stack', t => {
-  shell.pushd('-n', 'resources/pushd');
-  const trail = shell.pushd('-n', 'resources/pushd/a');
+  shell.pushd('-n', 'test/resources/pushd');
+  const trail = shell.pushd('-n', 'test/resources/pushd/a');
   t.falsy(shell.error());
   t.is(process.cwd(), trail[0]);
   t.deepEqual(trail, [
     rootDir,
-    'resources/pushd/a',
-    'resources/pushd',
+    'test/resources/pushd/a',
+    'test/resources/pushd',
   ]);
 });
 
@@ -273,7 +274,8 @@ test('Push invalid directory', t => {
   shell.pushd('does/not/exist');
   t.is(
     shell.error(),
-    'pushd: no such file or directory: ' + path.resolve('.', 'does/not/exist')
+    `pushd: no such file or directory: ${path.resolve('.', 'does/not/exist')
+      .replace(/\\/g, '/')}`
   );
   t.is(process.cwd(), oldCwd);
 });
@@ -281,17 +283,17 @@ test('Push invalid directory', t => {
 test(
   'Push without args swaps top two directories when stack length is 2',
   t => {
-    let trail = shell.pushd('resources/pushd');
+    let trail = shell.pushd('test/resources/pushd');
     t.falsy(shell.error());
     t.is(trail.length, 2);
-    t.is(path.relative(rootDir, trail[0]), path.join('resources', 'pushd'));
+    t.is(path.relative(rootDir, trail[0]), path.join('test/resources', 'pushd'));
     t.is(trail[1], rootDir);
     t.is(process.cwd(), trail[0]);
     trail = shell.pushd();
     t.falsy(shell.error());
     t.is(trail.length, 2);
     t.is(trail[0], rootDir);
-    t.is(path.relative(rootDir, trail[1]), path.join('resources', 'pushd'));
+    t.is(path.relative(rootDir, trail[1]), path.join('test/resources', 'pushd'));
     t.is(process.cwd(), trail[0]);
   }
 );
@@ -299,27 +301,27 @@ test(
 test(
   'Push without args swaps top two directories for larger stacks',
   t => {
-    shell.pushd('resources/pushd');
+    shell.pushd('test/resources/pushd');
     shell.pushd();
-    const trail = shell.pushd('resources/pushd/a');
+    const trail = shell.pushd('test/resources/pushd/a');
     t.falsy(shell.error());
     t.is(trail.length, 3);
-    t.is(path.relative(rootDir, trail[0]), path.join('resources', 'pushd', 'a'));
+    t.is(path.relative(rootDir, trail[0]), path.join('test/resources', 'pushd', 'a'));
     t.is(trail[1], rootDir);
-    t.is(path.relative(rootDir, trail[2]), path.join('resources', 'pushd'));
+    t.is(path.relative(rootDir, trail[2]), path.join('test/resources', 'pushd'));
     t.is(process.cwd(), trail[0]);
   }
 );
 
 test('Pushing with no args', t => {
-  shell.pushd('-n', 'resources/pushd');
-  shell.pushd('resources/pushd/a');
+  shell.pushd('-n', 'test/resources/pushd');
+  shell.pushd('test/resources/pushd/a');
   const trail = shell.pushd();
   t.falsy(shell.error());
   t.is(trail.length, 3);
   t.is(trail[0], rootDir);
-  t.is(path.relative(rootDir, trail[1]), path.join('resources', 'pushd', 'a'));
-  t.is(path.relative(rootDir, trail[2]), path.join('resources', 'pushd'));
+  t.is(path.relative(rootDir, trail[1]), path.join('test/resources', 'pushd', 'a'));
+  t.is(path.relative(rootDir, trail[2]), path.join('test/resources', 'pushd'));
   t.is(process.cwd(), trail[0]);
 });
 
@@ -327,3 +329,49 @@ test('Push without arguments invalid when stack is empty', t => {
   shell.pushd();
   t.is(shell.error(), 'pushd: no other directory');
 });
+
+test('quiet mode off', t => {
+  try {
+    shell.config.silent = false;
+    mocks.stdout.init();
+    mocks.stderr.init();
+    const trail = shell.pushd('test/resources/pushd');
+    const stdout = mocks.stdout.getValue();
+    const stderr = mocks.stderr.getValue();
+    t.falsy(shell.error());
+    t.is(stdout, '');
+    t.is(stderr, `${path.resolve(rootDir, 'test/resources/pushd')} ${rootDir}\n`);
+    t.is(process.cwd(), trail[0]);
+    t.deepEqual(trail, [
+      path.resolve(rootDir, 'test/resources/pushd'),
+      rootDir,
+    ]);
+  } finally {
+    shell.config.silent = true;
+    mocks.stdout.restore();
+    mocks.stderr.restore();
+  }
+});
+
+test('quiet mode on', t => {
+  try {
+    shell.config.silent = false;
+    mocks.stdout.init();
+    mocks.stderr.init();
+    const trail = shell.pushd('-q', 'test/resources/pushd');
+    const stdout = mocks.stdout.getValue();
+    const stderr = mocks.stderr.getValue();
+    t.falsy(shell.error());
+    t.is(stdout, '');
+    t.is(stderr, '');
+    t.is(process.cwd(), trail[0]);
+    t.deepEqual(trail, [
+      path.resolve(rootDir, 'test/resources/pushd'),
+      rootDir,
+    ]);
+  } finally {
+    shell.config.silent = true;
+    mocks.stdout.restore();
+    mocks.stderr.restore();
+  }
+});
diff --git a/test/pwd.js b/test/pwd.js
index ce55b76ce..6e6534cc5 100644
--- a/test/pwd.js
+++ b/test/pwd.js
@@ -1,9 +1,9 @@
-import path from 'path';
+const path = require('path');
 
-import test from 'ava';
+const test = require('ava');
 
-import shell from '..';
-import utils from './utils/utils';
+const shell = require('..');
+const utils = require('./utils/utils');
 
 const cur = process.cwd();
 
diff --git a/test/resources/cat/file3 b/test/resources/cat/file3
new file mode 100644
index 000000000..29f446afe
--- /dev/null
+++ b/test/resources/cat/file3
@@ -0,0 +1 @@
+test3
\ No newline at end of file
diff --git a/test/resources/cat/file4 b/test/resources/cat/file4
new file mode 100644
index 000000000..f4538a5cc
--- /dev/null
+++ b/test/resources/cat/file4
@@ -0,0 +1,12 @@
+test4-01
+test4-02
+test4-03
+test4-04
+test4-05
+test4-06
+test4-07
+test4-08
+test4-09
+test4-10
+test4-11
+test4-12
diff --git a/test/resources/cat/file5 b/test/resources/cat/file5
new file mode 100644
index 000000000..e69de29bb
diff --git a/test/resources/cp/file1 b/test/resources/cp/file1
new file mode 100644
index 000000000..180cf8328
--- /dev/null
+++ b/test/resources/cp/file1
@@ -0,0 +1 @@
+test2
diff --git a/test/resources/exec/slow.js b/test/resources/exec/slow.js
index cffff43f5..d8f26becd 100644
--- a/test/resources/exec/slow.js
+++ b/test/resources/exec/slow.js
@@ -1,4 +1,5 @@
 #!/usr/bin/env node
+console.log('fast');
 setTimeout(function() {
     console.log('slow');
 }, parseInt(process.argv[2], 10));
diff --git a/test/resources/find/dir2_link b/test/resources/find/dir2_link
new file mode 120000
index 000000000..1e039be90
--- /dev/null
+++ b/test/resources/find/dir2_link
@@ -0,0 +1 @@
+dir2
\ No newline at end of file
diff --git a/test/resources/grep/case1 b/test/resources/grep/case1
new file mode 100644
index 000000000..b08f7b082
--- /dev/null
+++ b/test/resources/grep/case1
@@ -0,0 +1 @@
+Test3
diff --git a/test/resources/grep/case1.js b/test/resources/grep/case1.js
new file mode 100644
index 000000000..df6b0d2bc
--- /dev/null
+++ b/test/resources/grep/case1.js
@@ -0,0 +1 @@
+test3
diff --git a/test/resources/grep/case1.txt b/test/resources/grep/case1.txt
new file mode 100644
index 000000000..bac87cc8e
--- /dev/null
+++ b/test/resources/grep/case1.txt
@@ -0,0 +1 @@
+TEST3
diff --git a/test/resources/grep/file2 b/test/resources/grep/file2
new file mode 100644
index 000000000..0c37715dc
--- /dev/null
+++ b/test/resources/grep/file2
@@ -0,0 +1,3 @@
+-v
+-vv
+-a
diff --git a/test/resources/grep/file3 b/test/resources/grep/file3
new file mode 100644
index 000000000..e4bee9f8c
--- /dev/null
+++ b/test/resources/grep/file3
@@ -0,0 +1,15 @@
+line1
+line2 test line
+line3 test line
+line4
+line5
+line6
+line7
+line8
+line9
+line10 test line
+line11
+line12
+line13
+line14
+line15 test line
diff --git a/test/resources/sed/empty.txt b/test/resources/sed/empty.txt
new file mode 100644
index 000000000..e69de29bb
diff --git a/test/resources/shjs/a-file.js b/test/resources/shjs/a-file.js
deleted file mode 100644
index 3050cd9a6..000000000
--- a/test/resources/shjs/a-file.js
+++ /dev/null
@@ -1,2 +0,0 @@
-console.log('OK!');
-process.exit(0);
diff --git a/test/resources/shjs/coffeescript.coffee b/test/resources/shjs/coffeescript.coffee
deleted file mode 100644
index 5b2766405..000000000
--- a/test/resources/shjs/coffeescript.coffee
+++ /dev/null
@@ -1,2 +0,0 @@
-msg = 'CoffeeScript: OK!'
-console.log msg
diff --git a/test/resources/shjs/exit-0.js b/test/resources/shjs/exit-0.js
deleted file mode 100644
index dcbbff6c9..000000000
--- a/test/resources/shjs/exit-0.js
+++ /dev/null
@@ -1 +0,0 @@
-process.exit(0);
diff --git a/test/resources/shjs/exit-codes.js b/test/resources/shjs/exit-codes.js
deleted file mode 100644
index 6427ca060..000000000
--- a/test/resources/shjs/exit-codes.js
+++ /dev/null
@@ -1 +0,0 @@
-process.exit(42);
diff --git a/test/resources/shjs/stdout-stderr.js b/test/resources/shjs/stdout-stderr.js
deleted file mode 100644
index 220cb58f8..000000000
--- a/test/resources/shjs/stdout-stderr.js
+++ /dev/null
@@ -1,2 +0,0 @@
-console.log('stdout: OK!');
-console.error('stderr: OK!');
diff --git a/test/resources/which/node b/test/resources/which/node
new file mode 100644
index 000000000..0b917ba31
--- /dev/null
+++ b/test/resources/which/node
@@ -0,0 +1 @@
+text file, not an executable
diff --git a/test/rm.js b/test/rm.js
index cdb3e925f..01efd7c0b 100644
--- a/test/rm.js
+++ b/test/rm.js
@@ -1,15 +1,15 @@
-import fs from 'fs';
-import path from 'path';
+const fs = require('fs');
+const path = require('path');
 
-import test from 'ava';
+const test = require('ava');
 
-import shell from '..';
-import utils from './utils/utils';
+const shell = require('..');
+const utils = require('./utils/utils');
 
 test.beforeEach(t => {
   t.context.tmp = utils.getTempDir();
   shell.config.resetForTesting();
-  shell.cp('-r', 'resources', t.context.tmp);
+  shell.cp('-r', 'test/resources', t.context.tmp);
 });
 
 test.afterEach.always(t => {
@@ -35,6 +35,13 @@ test('file does not exist', t => {
   t.is(result.stderr, 'rm: no such file or directory: asdfasdf');
 });
 
+test('cannot delete a directory without recursive flag', t => {
+  const result = shell.rm(`${t.context.tmp}/rm`);
+  t.truthy(shell.error());
+  t.is(result.code, 1);
+  t.is(result.stderr, 'rm: path is a directory');
+});
+
 test('only an option', t => {
   const result = shell.rm('-f');
   t.truthy(shell.error());
@@ -43,10 +50,10 @@ test('only an option', t => {
 });
 
 test('invalid option', t => {
-  const result = shell.rm('-@', 'resources/file1');
+  const result = shell.rm('-@', 'test/resources/file1');
   t.truthy(shell.error());
   t.is(result.code, 1);
-  t.truthy(fs.existsSync('resources/file1'));
+  t.truthy(fs.existsSync('test/resources/file1'));
   t.is(result.stderr, 'rm: option not recognized: @');
 });
 
@@ -143,7 +150,7 @@ test('recursive dir removal', t => {
   t.is(result.code, 0);
   const contents = fs.readdirSync(t.context.tmp);
   t.is(contents.length, 1);
-  t.is(contents[0], '.hidden'); // shouldn't remove hiddden if no .* given
+  t.is(contents[0], '.hidden'); // shouldn't remove hidden if no .* given
 });
 
 test('recursive dir removal #2', t => {
@@ -260,27 +267,28 @@ test('remove symbolic link to a dir', t => {
   t.truthy(fs.existsSync(`${t.context.tmp}/rm/a_dir`));
 });
 
-// TODO(nfischer): fix this behavior in rm
-test.skip('rm -rf on a symbolic link to a dir deletes its contents', t => {
-  const result = shell.rm('-rf', `${t.context.tmp}/rm/link_to_a_dir/`);
-  t.falsy(shell.error());
-  t.is(result.code, 0);
+test('rm -rf on a symbolic link to a dir deletes its contents', t => {
+  utils.skipOnWin(t, () => {
+    const result = shell.rm('-rf', `${t.context.tmp}/rm/link_to_a_dir/`);
+    t.falsy(shell.error());
+    t.is(result.code, 0);
 
-  // Both the link and original dir should remain, but contents are deleted
-  t.truthy(fs.existsSync(`${t.context.tmp}/rm/link_to_a_dir`));
-  t.truthy(fs.existsSync(`${t.context.tmp}/rm/a_dir`));
-  t.falsy(fs.existsSync(`${t.context.tmp}/rm/a_dir/a_file`));
+    // Both the link and original dir should remain, but contents are deleted
+    t.truthy(fs.existsSync(`${t.context.tmp}/rm/link_to_a_dir`));
+    t.truthy(fs.existsSync(`${t.context.tmp}/rm/a_dir`));
+    t.falsy(fs.existsSync(`${t.context.tmp}/rm/a_dir/a_file`));
+  });
 });
 
 test('remove broken symbolic link', t => {
-  if (process.platform !== 'win32') {
+  utils.skipOnWin(t, () => {
     t.truthy(shell.test('-L', `${t.context.tmp}/rm/fake.lnk`));
     const result = shell.rm(`${t.context.tmp}/rm/fake.lnk`);
     t.falsy(shell.error());
     t.is(result.code, 0);
     t.falsy(shell.test('-L', `${t.context.tmp}/rm/fake.lnk`));
     t.falsy(fs.existsSync(`${t.context.tmp}/rm/fake.lnk`));
-  }
+  });
 });
 
 test('recursive dir removal, for non-normalized path', t => {
@@ -291,3 +299,12 @@ test('recursive dir removal, for non-normalized path', t => {
   t.is(result.code, 0);
   t.falsy(fs.existsSync(`${t.context.tmp}/a`));
 });
+
+test('remove fifo', t => {
+  utils.skipOnWin(t, () => {
+    const fifo = utils.mkfifo(t.context.tmp);
+    const result = shell.rm(fifo);
+    t.falsy(shell.error());
+    t.is(result.code, 0);
+  });
+});
diff --git a/test/sed.js b/test/sed.js
index c8342c13d..fa0d41810 100644
--- a/test/sed.js
+++ b/test/sed.js
@@ -1,14 +1,14 @@
-import fs from 'fs';
+const fs = require('fs');
 
-import test from 'ava';
+const test = require('ava');
 
-import shell from '..';
-import utils from './utils/utils';
+const shell = require('..');
+const utils = require('./utils/utils');
 
 test.beforeEach(t => {
   t.context.tmp = utils.getTempDir();
   shell.config.resetForTesting();
-  shell.cp('-r', 'resources', t.context.tmp);
+  shell.cp('-r', 'test/resources', t.context.tmp);
 });
 
 test.afterEach.always(t => {
@@ -94,12 +94,12 @@ test('-i option', t => {
   const result = shell.sed('-i', /test1/, 'hello', `${t.context.tmp}/file1`);
   t.falsy(shell.error());
   t.is(result.code, 0);
-  t.is(result.toString(), 'hello');
+  t.is(result.toString(), '');
   t.is(shell.cat(`${t.context.tmp}/file1`).toString(), 'hello');
 });
 
 test('make sure * in regex is not globbed', t => {
-  const result = shell.sed(/alpha*beta/, 'hello', 'resources/grep/file');
+  const result = shell.sed(/alpha*beta/, 'hello', 'test/resources/grep/file');
   t.falsy(shell.error());
   t.is(result.code, 0);
   t.is(
@@ -109,7 +109,7 @@ test('make sure * in regex is not globbed', t => {
 });
 
 test('make sure * in string-regex is not globbed', t => {
-  const result = shell.sed('alpha*beta', 'hello', 'resources/grep/file');
+  const result = shell.sed('alpha*beta', 'hello', 'test/resources/grep/file');
   t.falsy(shell.error());
   t.is(result.code, 0);
   t.is(
@@ -119,7 +119,7 @@ test('make sure * in string-regex is not globbed', t => {
 });
 
 test('make sure * in regex is not globbed (matches something)', t => {
-  const result = shell.sed(/l*\.js/, '', 'resources/grep/file');
+  const result = shell.sed(/l*\.js/, '', 'test/resources/grep/file');
   t.falsy(shell.error());
   t.is(result.code, 0);
   t.is(
@@ -129,7 +129,7 @@ test('make sure * in regex is not globbed (matches something)', t => {
 });
 
 test('make sure * in string-regex is not globbed (matches something)', t => {
-  const result = shell.sed('l*\\.js', '', 'resources/grep/file');
+  const result = shell.sed('l*\\.js', '', 'test/resources/grep/file');
   t.falsy(shell.error());
   t.is(result.code, 0);
   t.is(
@@ -159,7 +159,7 @@ test('multiple file names, with in-place-replacement', t => {
     `${t.context.tmp}/file2`]);
   t.falsy(shell.error());
   t.is(result.code, 0);
-  t.is(result.toString(), 'hello1\nhello2');
+  t.is(result.toString(), '');
   t.is(shell.cat(`${t.context.tmp}/file1`).toString(), 'hello1');
   t.is(shell.cat(`${t.context.tmp}/file2`).toString(), 'hello2');
 });
@@ -170,7 +170,13 @@ test('glob file names, with in-place-replacement', t => {
   const result = shell.sed('-i', 'test', 'hello', `${t.context.tmp}/file*.txt`);
   t.falsy(shell.error());
   t.is(result.code, 0);
-  t.is(result.toString(), 'hello1\n\nhello2\n'); // TODO: fix sed's behavior
+  t.is(result.toString(), '');
   t.is(shell.cat(`${t.context.tmp}/file1.txt`).toString(), 'hello1\n');
   t.is(shell.cat(`${t.context.tmp}/file2.txt`).toString(), 'hello2\n');
 });
+
+test('empty file', t => {
+  const result = shell.sed('widget', 'wizzle', 'test/resources/sed/empty.txt');
+  t.is(result.code, 0);
+  t.is(result.toString(), '');
+});
diff --git a/test/set.js b/test/set.js
index 446d52ed8..94c0a0bfa 100644
--- a/test/set.js
+++ b/test/set.js
@@ -1,8 +1,7 @@
-import test from 'ava';
+const test = require('ava');
 
-import shell from '..';
-import common from '../src/common';
-import utils from './utils/utils';
+const shell = require('..');
+const utils = require('./utils/utils');
 
 const oldConfigSilent = shell.config.silent;
 const uncaughtErrorExitCode = 1;
@@ -10,7 +9,7 @@ const uncaughtErrorExitCode = 1;
 test.beforeEach(t => {
   t.context.tmp = utils.getTempDir();
   shell.config.resetForTesting();
-  shell.cp('-r', 'resources', t.context.tmp);
+  shell.cp('-r', 'test/resources', t.context.tmp);
 });
 
 test.afterEach.always(t => {
@@ -29,21 +28,21 @@ test('initial values', t => {
 });
 
 test('default behavior', t => {
-  const result = shell.exec(JSON.stringify(common.config.execPath) + ' -e "require(\'../global\'); ls(\'file_doesnt_exist\'); echo(1234);"');
+  const result = shell.exec(JSON.stringify(shell.config.execPath) + ` -e "require('./global'); ls('file_doesnt_exist'); echo(1234);"`);
   t.is(result.code, 0);
   t.is(result.stdout, '1234\n');
   t.is(result.stderr, 'ls: no such file or directory: file_doesnt_exist\n');
 });
 
 test('set -e', t => {
-  const result = shell.exec(JSON.stringify(common.config.execPath) + ' -e "require(\'../global\'); set(\'-e\'); ls(\'file_doesnt_exist\'); echo(1234);"');
+  const result = shell.exec(JSON.stringify(shell.config.execPath) + ` -e "require('./global'); set('-e'); ls('file_doesnt_exist'); echo(1234);"`);
   t.is(result.code, uncaughtErrorExitCode);
   t.is(result.stdout, '');
-  t.truthy(result.stderr.indexOf('Error: ls: no such file or directory: file_doesnt_exist') >= 0);
+  t.truthy(result.stderr.includes('Error: ls: no such file or directory: file_doesnt_exist'));
 });
 
 test('set -v', t => {
-  const result = shell.exec(JSON.stringify(common.config.execPath) + ' -e "require(\'../global\'); set(\'-v\'); ls(\'file_doesnt_exist\'); echo(1234);"');
+  const result = shell.exec(JSON.stringify(shell.config.execPath) + ` -e "require('./global'); set('-v'); ls('file_doesnt_exist'); echo(1234);"`);
   t.is(result.code, 0);
   t.is(result.stdout, '1234\n');
   t.is(
@@ -53,16 +52,16 @@ test('set -v', t => {
 });
 
 test('set -ev', t => {
-  const result = shell.exec(JSON.stringify(common.config.execPath) + ' -e "require(\'../global\'); set(\'-ev\'); ls(\'file_doesnt_exist\'); echo(1234);"');
+  const result = shell.exec(JSON.stringify(shell.config.execPath) + ` -e "require('./global'); set('-ev'); ls('file_doesnt_exist'); echo(1234);"`);
   t.is(result.code, uncaughtErrorExitCode);
   t.is(result.stdout, '');
-  t.truthy(result.stderr.indexOf('Error: ls: no such file or directory: file_doesnt_exist') >= 0);
-  t.truthy(result.stderr.indexOf('ls file_doesnt_exist\n') >= 0);
-  t.is(result.stderr.indexOf('echo 1234\n'), -1);
+  t.truthy(result.stderr.includes('Error: ls: no such file or directory: file_doesnt_exist'));
+  t.truthy(result.stderr.includes('ls file_doesnt_exist\n'));
+  t.falsy(result.stderr.includes('echo 1234\n'));
 });
 
 test('set -e, set +e', t => {
-  const result = shell.exec(JSON.stringify(common.config.execPath) + ' -e "require(\'../global\'); set(\'-e\'); set(\'+e\'); ls(\'file_doesnt_exist\'); echo(1234);"');
+  const result = shell.exec(JSON.stringify(shell.config.execPath) + ` -e "require('./global'); set('-e'); set('+e'); ls('file_doesnt_exist'); echo(1234);"`);
   t.is(result.code, 0);
   t.is(result.stdout, '1234\n');
   t.is(result.stderr, 'ls: no such file or directory: file_doesnt_exist\n');
@@ -76,4 +75,3 @@ test('set -f', t => {
   shell.rm(`${t.context.tmp}/*.txt`);
   t.falsy(shell.error()); // globbing works, so rm succeeds
 });
-
diff --git a/test/shjs.js b/test/shjs.js
deleted file mode 100644
index 9a4221a5d..000000000
--- a/test/shjs.js
+++ /dev/null
@@ -1,55 +0,0 @@
-import path from 'path';
-
-import test from 'ava';
-
-import shell from '..';
-import common from '../src/common';
-
-function runWithShjs(name) {
-  // prefix with 'node ' for Windows, don't prefix for unix
-  const binPath = path.resolve(__dirname, '../bin/shjs');
-  const execPath = process.platform === 'win32'
-    ? `${JSON.stringify(common.config.execPath)} `
-    : '';
-  const script = path.resolve(__dirname, 'resources', 'shjs', name);
-  return shell.exec(`${execPath}${binPath} ${script}`, { silent: true });
-}
-
-//
-// Valids
-//
-
-test('Non-zero exit code', t => {
-  const result = runWithShjs('exit-codes.js');
-  t.is(result.code, 42);
-  t.is(result.stdout, '');
-  t.falsy(result.stderr);
-});
-
-test('Zero exit code', t => {
-  const result = runWithShjs('exit-0.js');
-  t.is(result.code, 0);
-  t.is(result.stdout, '');
-  t.falsy(result.stderr);
-});
-
-test('Stdout/Stderr', t => {
-  const result = runWithShjs('stdout-stderr.js');
-  t.is(result.code, 0);
-  t.is(result.stdout, 'stdout: OK!\n');
-  t.is(result.stderr, 'stderr: OK!\n');
-});
-
-test('CoffeeScript', t => {
-  const result = runWithShjs('coffeescript.coffee');
-  t.is(result.code, 0);
-  t.is(result.stdout, 'CoffeeScript: OK!\n');
-  t.falsy(result.stderr);
-});
-
-test('Extension detection', t => {
-  const result = runWithShjs('a-file');
-  t.is(result.code, 0);
-  t.is(result.stdout, 'OK!\n');
-  t.falsy(result.stderr);
-});
diff --git a/test/sort.js b/test/sort.js
index 23109d24e..ac716e87c 100644
--- a/test/sort.js
+++ b/test/sort.js
@@ -1,12 +1,13 @@
-import fs from 'fs';
+const fs = require('fs');
 
-import test from 'ava';
+const test = require('ava');
 
-import shell from '..';
+const shell = require('..');
+const common = require('../src/common');
 
 shell.config.silent = true;
 
-const doubleSorted = shell.cat('resources/sort/sorted')
+const doubleSorted = shell.cat('test/resources/sort/sorted')
                         .trimRight()
                         .split('\n')
                         .reduce((prev, cur) => prev.concat([cur, cur]), [])
@@ -25,73 +26,81 @@ test('no args', t => {
 
 test('file does not exist', t => {
   t.falsy(fs.existsSync('/asdfasdf')); // sanity check
-  const result = shell.sort('/adsfasdf');
+  const result = shell.sort('/asdfasdf');
   t.truthy(shell.error());
   t.truthy(result.code);
 });
 
+test('directory', t => {
+  t.truthy(common.statFollowLinks('test/resources/').isDirectory()); // sanity check
+  const result = shell.sort('test/resources/');
+  t.truthy(shell.error());
+  t.is(result.code, 1);
+  t.is(result.stderr, 'sort: read failed: test/resources/: Is a directory');
+});
+
 //
 // Valids
 //
 
 test('simple', t => {
-  const result = shell.sort('resources/sort/file1');
+  const result = shell.sort('test/resources/sort/file1');
   t.falsy(shell.error());
   t.is(result.code, 0);
-  t.is(result.toString(), shell.cat('resources/sort/sorted').toString());
+  t.is(result.toString(), shell.cat('test/resources/sort/sorted').toString());
 });
 
 test('simple #2', t => {
-  const result = shell.sort('resources/sort/file2');
+  const result = shell.sort('test/resources/sort/file2');
   t.falsy(shell.error());
   t.is(result.code, 0);
-  t.is(result.toString(), shell.cat('resources/sort/sorted').toString());
+  t.is(result.toString(), shell.cat('test/resources/sort/sorted').toString());
 });
 
 test('multiple files', t => {
-  const result = shell.sort('resources/sort/file2', 'resources/sort/file1');
+  const result = shell.sort('test/resources/sort/file2', 'test/resources/sort/file1');
   t.falsy(shell.error());
   t.is(result.code, 0);
   t.is(result.toString(), doubleSorted);
 });
 
 test('multiple files, array syntax', t => {
-  const result = shell.sort(['resources/sort/file2', 'resources/sort/file1']);
+  const result = shell.sort(['test/resources/sort/file2', 'test/resources/sort/file1']);
   t.falsy(shell.error());
   t.is(result.code, 0);
   t.is(result.toString(), doubleSorted);
 });
 
 test('Globbed file', t => {
-  const result = shell.sort('resources/sort/file?');
+  const result = shell.sort('test/resources/sort/file?');
   t.falsy(shell.error());
   t.is(result.code, 0);
   t.is(result.toString(), doubleSorted);
 });
 
-test('With \'-n\' option', t => {
-  const result = shell.sort('-n', 'resources/sort/file2');
+test("With '-n' option", t => {
+  const result = shell.sort('-n', 'test/resources/sort/file2');
   t.falsy(shell.error());
   t.is(result.code, 0);
-  t.is(result.toString(), shell.cat('resources/sort/sortedDashN').toString());
+  t.is(result.toString(), shell.cat('test/resources/sort/sortedDashN').toString());
 });
 
-test('With \'-r\' option', t => {
-  const result = shell.sort('-r', 'resources/sort/file2');
+test("With '-r' option", t => {
+  const result = shell.sort('-r', 'test/resources/sort/file2');
   t.falsy(shell.error());
   t.is(result.code, 0);
-  t.is(result.toString(), shell.cat('resources/sort/sorted')
+  t.is(result.toString(), shell.cat('test/resources/sort/sorted')
     .trimRight()
     .split('\n')
     .reverse()
     .join('\n') + '\n');
 });
 
-test('With \'-rn\' option', t => {
-  const result = shell.sort('-rn', 'resources/sort/file2');
+test("With '-rn' option", t => {
+  const result = shell.sort('-rn', 'test/resources/sort/file2');
   t.falsy(shell.error());
   t.is(result.code, 0);
-  t.is(result.toString(), shell.cat('resources/sort/sortedDashN')
+  t.is(result.toString(), shell.cat('test/resources/sort/sortedDashN')
     .trimRight()
     .split('\n')
     .reverse()
diff --git a/test/tail.js b/test/tail.js
index 1ec7dd80f..158b45d8f 100644
--- a/test/tail.js
+++ b/test/tail.js
@@ -1,8 +1,9 @@
-import fs from 'fs';
+const fs = require('fs');
 
-import test from 'ava';
+const test = require('ava');
 
-import shell from '..';
+const shell = require('..');
+const common = require('../src/common');
 
 shell.config.silent = true;
 
@@ -18,11 +19,19 @@ test('no args', t => {
 
 test('file does not exist', t => {
   t.falsy(fs.existsSync('/asdfasdf')); // sanity check
-  const result = shell.tail('/adsfasdf');
+  const result = shell.tail('/asdfasdf');
   t.truthy(shell.error());
   t.is(result.code, 1);
 });
 
+test('directory', t => {
+  t.truthy(common.statFollowLinks('test/resources/').isDirectory()); // sanity check
+  const result = shell.tail('test/resources/');
+  t.truthy(shell.error());
+  t.is(result.code, 1);
+  t.is(result.stderr, "tail: error reading 'test/resources/': Is a directory");
+});
+
 //
 // Valids
 //
@@ -37,14 +46,14 @@ const bottomOfFile2 = ['file2 50', 'file2 49', 'file2 48', 'file2 47', 'file2 46
                        'file2 35', 'file2 34', 'file2 33', 'file2 32', 'file2 31'];
 
 test('simple', t => {
-  const result = shell.tail('resources/head/file1.txt');
+  const result = shell.tail('test/resources/head/file1.txt');
   t.falsy(shell.error());
   t.is(result.code, 0);
   t.is(result.toString(), bottomOfFile1.slice(0, 10).reverse().join('\n') + '\n');
 });
 
 test('multiple files', t => {
-  const result = shell.tail('resources/head/file2.txt', 'resources/head/file1.txt');
+  const result = shell.tail('test/resources/head/file2.txt', 'test/resources/head/file1.txt');
   t.falsy(shell.error());
   t.is(result.code, 0);
   t.is(result.toString(),
@@ -56,7 +65,7 @@ test('multiple files', t => {
 });
 
 test('multiple files, array syntax', t => {
-  const result = shell.tail(['resources/head/file2.txt', 'resources/head/file1.txt']);
+  const result = shell.tail(['test/resources/head/file2.txt', 'test/resources/head/file1.txt']);
   t.falsy(shell.error());
   t.is(result.code, 0);
   t.is(result.toString(),
@@ -68,21 +77,21 @@ test('multiple files, array syntax', t => {
 });
 
 test('reading more lines than are in the file (no trailing newline)', t => {
-  const result = shell.tail('resources/file2', 'resources/file1');
+  const result = shell.tail('test/resources/file2', 'test/resources/file1');
   t.falsy(shell.error());
   t.is(result.code, 0);
   t.is(result.toString(), 'test2\ntest1'); // these files only have one line (no \n)
 });
 
 test('reading more lines than are in the file (with trailing newline)', t => {
-  const result = shell.tail('resources/head/shortfile2', 'resources/head/shortfile1');
+  const result = shell.tail('test/resources/head/shortfile2', 'test/resources/head/shortfile1');
   t.falsy(shell.error());
   t.is(result.code, 0);
   t.is(result.toString(), 'short2\nshort1\n'); // these files only have one line (with \n)
 });
 
-test('Globbed file', t => {
-  const result = shell.tail('resources/head/file?.txt');
+test('globbed file', t => {
+  const result = shell.tail('test/resources/head/file?.txt');
   t.falsy(shell.error());
   t.is(result.code, 0);
   t.is(result.toString(),
@@ -93,9 +102,9 @@ test('Globbed file', t => {
       .join('\n') + '\n');
 });
 
-test('With `\'-n\' <num>` option', t => {
-  const result = shell.tail('-n', 4, 'resources/head/file2.txt',
-    'resources/head/file1.txt');
+test("with '-n <num>' option", t => {
+  const result = shell.tail('-n', 4, 'test/resources/head/file2.txt',
+    'test/resources/head/file1.txt');
   t.falsy(shell.error());
   t.is(result.code, 0);
   t.is(result.toString(),
@@ -106,9 +115,22 @@ test('With `\'-n\' <num>` option', t => {
       .join('\n') + '\n');
 });
 
-test('With `{\'-n\': <num>}` option', t => {
-  const result = shell.tail({ '-n': 4 }, 'resources/head/file2.txt',
-    'resources/head/file1.txt');
+test("with '-n +<num>' option", t => {
+  const result = shell.tail('-n', '+48', 'test/resources/head/file2.txt',
+    'test/resources/head/file1.txt');
+  t.falsy(shell.error());
+  t.is(result.code, 0);
+  t.is(result.toString(),
+    bottomOfFile2
+      .slice(0, 3)
+      .reverse()
+      .concat(bottomOfFile1.slice(0, 3).reverse())
+      .join('\n') + '\n');
+});
+
+test("with '{-n: <num>}' option", t => {
+  const result = shell.tail({ '-n': 4 }, 'test/resources/head/file2.txt',
+    'test/resources/head/file1.txt');
   t.falsy(shell.error());
   t.is(result.code, 0);
   t.is(result.toString(),
@@ -119,9 +141,22 @@ test('With `{\'-n\': <num>}` option', t => {
       .join('\n') + '\n');
 });
 
+test("with '{-n: +<num>}' option", t => {
+  const result = shell.tail({ '-n': '+48' }, 'test/resources/head/file2.txt',
+    'test/resources/head/file1.txt');
+  t.falsy(shell.error());
+  t.is(result.code, 0);
+  t.is(result.toString(),
+    bottomOfFile2
+      .slice(0, 3)
+      .reverse()
+      .concat(bottomOfFile1.slice(0, 3).reverse())
+      .join('\n') + '\n');
+});
+
 test('negative values are the same as positive values', t => {
-  const result = shell.tail('-n', -4, 'resources/head/file2.txt',
-    'resources/head/file1.txt');
+  const result = shell.tail('-n', -4, 'test/resources/head/file2.txt',
+    'test/resources/head/file1.txt');
   t.falsy(shell.error());
   t.is(result.code, 0);
   t.is(result.toString(),
diff --git a/test/tempdir.js b/test/tempdir.js
index ed7ec77fd..5590667e7 100644
--- a/test/tempdir.js
+++ b/test/tempdir.js
@@ -1,8 +1,9 @@
-import fs from 'fs';
+const fs = require('fs');
 
-import test from 'ava';
+const test = require('ava');
 
-import shell from '..';
+const shell = require('..');
+const { isCached, clearCache } = require('../src/tempdir');
 
 shell.config.silent = true;
 
@@ -19,3 +20,12 @@ test('basic usage', t => {
   // It's a directory
   t.truthy(shell.test('-d', tmp));
 });
+
+test('cache', t => {
+  clearCache(); // In case this runs after any test which relies on tempdir().
+  t.falsy(isCached());
+  const tmp1 = shell.tempdir();
+  t.truthy(isCached());
+  const tmp2 = shell.tempdir();
+  t.is(tmp1, tmp2);
+});
diff --git a/test/test.js b/test/test.js
index 498bbea6d..1b42057ae 100644
--- a/test/test.js
+++ b/test/test.js
@@ -1,7 +1,7 @@
-import test from 'ava';
+const test = require('ava');
 
-import shell from '..';
-import common from '../src/common';
+const shell = require('..');
+const utils = require('./utils/utils');
 
 shell.config.silent = true;
 
@@ -20,7 +20,7 @@ test('bad expression', t => {
 });
 
 test('bad expression #2', t => {
-  shell.test('f', 'resources/file1');
+  shell.test('f', 'test/resources/file1');
   t.truthy(shell.error());
 });
 
@@ -35,97 +35,97 @@ test('no file', t => {
 
 
 test('-e option succeeds for files', t => {
-  const result = shell.test('-e', 'resources/file1');
+  const result = shell.test('-e', 'test/resources/file1');
   t.falsy(shell.error());
   t.truthy(result);
 });
 
 test('-e option fails if it does not exist', t => {
-  const result = shell.test('-e', 'resources/404');
+  const result = shell.test('-e', 'test/resources/404');
   t.falsy(shell.error());
   t.falsy(result);
 });
 
 test('-d option succeeds for a directory', t => {
-  const result = shell.test('-d', 'resources');
+  const result = shell.test('-d', 'test/resources');
   t.falsy(shell.error());
   t.truthy(result);
 });
 
 test('-f option fails for a directory', t => {
-  const result = shell.test('-f', 'resources');
+  const result = shell.test('-f', 'test/resources');
   t.falsy(shell.error());
   t.falsy(result);
 });
 
 test('-L option fails for a directory', t => {
-  const result = shell.test('-L', 'resources');
+  const result = shell.test('-L', 'test/resources');
   t.falsy(shell.error());
   t.falsy(result);
 });
 
 test('-d option fails for a file', t => {
-  const result = shell.test('-d', 'resources/file1');
+  const result = shell.test('-d', 'test/resources/file1');
   t.falsy(shell.error());
   t.falsy(result);
 });
 
 test('-f option succeeds for a file', t => {
-  const result = shell.test('-f', 'resources/file1');
+  const result = shell.test('-f', 'test/resources/file1');
   t.falsy(shell.error());
   t.truthy(result);
 });
 
 test('-L option fails for a file', t => {
-  const result = shell.test('-L', 'resources/file1');
+  const result = shell.test('-L', 'test/resources/file1');
   t.falsy(shell.error());
   t.falsy(result);
 });
 
 test('test command is not globbed', t => {
   // regression #529
-  const result = shell.test('-f', 'resources/**/*.js');
+  const result = shell.test('-f', 'test/resources/**/*.js');
   t.falsy(shell.error());
   t.falsy(result);
 });
 
 // TODO(nate): figure out a way to test links on Windows
 test('-d option fails for a link', t => {
-  if (common.platform !== 'win') {
-    const result = shell.test('-d', 'resources/link');
+  utils.skipOnWin(t, () => {
+    const result = shell.test('-d', 'test/resources/link');
     t.falsy(shell.error());
     t.falsy(result);
-  }
+  });
 });
 
 test('-f option succeeds for a link', t => {
-  if (common.platform !== 'win') {
-    const result = shell.test('-f', 'resources/link');
+  utils.skipOnWin(t, () => {
+    const result = shell.test('-f', 'test/resources/link');
     t.falsy(shell.error());
     t.truthy(result);
-  }
+  });
 });
 
 test('-L option succeeds for a symlink', t => {
-  if (common.platform !== 'win') {
-    const result = shell.test('-L', 'resources/link');
+  utils.skipOnWin(t, () => {
+    const result = shell.test('-L', 'test/resources/link');
     t.falsy(shell.error());
     t.truthy(result);
-  }
+  });
 });
 
 test('-L option works for broken symlinks', t => {
-  if (common.platform !== 'win') {
-    const result = shell.test('-L', 'resources/badlink');
+  utils.skipOnWin(t, () => {
+    const result = shell.test('-L', 'test/resources/badlink');
     t.falsy(shell.error());
     t.truthy(result);
-  }
+  });
 });
 
 test('-L option fails for missing files', t => {
-  if (common.platform !== 'win') {
-    const result = shell.test('-L', 'resources/404');
+  utils.skipOnWin(t, () => {
+    const result = shell.test('-L', 'test/resources/404');
     t.falsy(shell.error());
     t.falsy(result);
-  }
+  });
 });
diff --git a/test/to.js b/test/to.js
index db3ce2450..4669052eb 100644
--- a/test/to.js
+++ b/test/to.js
@@ -1,9 +1,9 @@
-import fs from 'fs';
+const fs = require('fs');
 
-import test from 'ava';
+const test = require('ava');
 
-import shell from '..';
-import utils from './utils/utils';
+const shell = require('..');
+const utils = require('./utils/utils');
 
 test.beforeEach(t => {
   t.context.tmp = utils.getTempDir();
@@ -20,9 +20,9 @@ test.afterEach.always(t => {
 // Invalids
 //
 
-test('Normal strings don\'t have \'.to()\' anymore', t => {
+test("Normal strings don't have '.to()' anymore", t => {
   const str = 'hello world';
-  t.is(typeof str.to, 'undefined');
+  t.is(str.to, undefined);
 });
 
 test('no file argument', t => {
diff --git a/test/toEnd.js b/test/toEnd.js
index 323e4a857..4e8417396 100644
--- a/test/toEnd.js
+++ b/test/toEnd.js
@@ -1,9 +1,9 @@
-import fs from 'fs';
+const fs = require('fs');
 
-import test from 'ava';
+const test = require('ava');
 
-import shell from '..';
-import utils from './utils/utils';
+const shell = require('..');
+const utils = require('./utils/utils');
 
 test.beforeEach(t => {
   t.context.tmp = utils.getTempDir();
@@ -20,9 +20,9 @@ test.afterEach.always(t => {
 // Invalids
 //
 
-test('Normal strings don\'t have \'.toEnd()\' anymore', t => {
+test("Normal strings don't have '.toEnd()' anymore", t => {
   const str = 'hello world';
-  t.is(typeof str.toEnd, 'undefined');
+  t.is(str.toEnd, undefined);
 });
 
 test('missing file argument', t => {
@@ -30,6 +30,12 @@ test('missing file argument', t => {
   t.truthy(shell.error());
 });
 
+test('cannot write to a non-existent directory', t => {
+  t.falsy(fs.existsSync('/asdfasdf')); // sanity check
+  shell.ShellString('hello world').toEnd('/asdfasdf/file');
+  t.truthy(shell.error());
+});
+
 //
 // Valids
 //
diff --git a/test/touch.js b/test/touch.js
index ad5dbfd72..c767eafcd 100644
--- a/test/touch.js
+++ b/test/touch.js
@@ -1,10 +1,11 @@
-import crypto from 'crypto';
-import fs from 'fs';
+const crypto = require('crypto');
+const fs = require('fs');
 
-import test from 'ava';
+const test = require('ava');
 
-import shell from '..';
-import utils from './utils/utils';
+const shell = require('..');
+const common = require('../src/common');
+const utils = require('./utils/utils');
 
 test.beforeEach(t => {
   t.context.tmp = utils.getTempDir();
@@ -21,7 +22,7 @@ function resetUtimes(f) {
   const d = new Date();
   d.setYear(2000);
   fs.utimesSync(f, d, d);
-  return fs.statSync(f);
+  return common.statFollowLinks(f);
 }
 
 function tmpFile(t, noCreate) {
@@ -76,8 +77,8 @@ test('handles globs correctly', t => {
   const result = shell.touch(`${t.context.tmp}/file*`);
   t.is(result.code, 0);
   const files = shell.ls(`${t.context.tmp}/file*`);
-  t.truthy(files.indexOf(`${t.context.tmp}/file.txt`) > -1);
-  t.truthy(files.indexOf(`${t.context.tmp}/file.js`) > -1);
+  t.truthy(files.includes(`${t.context.tmp}/file.txt`));
+  t.truthy(files.includes(`${t.context.tmp}/file.js`));
   t.is(files.length, 2);
 });
 
@@ -98,33 +99,53 @@ test('uses a reference file for mtime', t => {
   t.falsy(shell.error());
   t.is(result.code, 0);
   t.not(
-    fs.statSync(testFile).mtime.getTime(),
-    fs.statSync(testFile2).mtime.getTime()
+    common.statFollowLinks(testFile).mtime.getTime(),
+    common.statFollowLinks(testFile2).mtime.getTime()
   );
   t.not(
-    fs.statSync(testFile).atime.getTime(),
-    fs.statSync(testFile2).atime.getTime()
+    common.statFollowLinks(testFile).atime.getTime(),
+    common.statFollowLinks(testFile2).atime.getTime()
   );
   result = shell.touch({ '-r': testFile2 }, testFile);
   t.falsy(shell.error());
   t.is(result.code, 0);
   t.is(
-    fs.statSync(testFile).mtime.getTime(),
-    fs.statSync(testFile2).mtime.getTime()
+    common.statFollowLinks(testFile).mtime.getTime(),
+    common.statFollowLinks(testFile2).mtime.getTime()
   );
   t.is(
-    fs.statSync(testFile).atime.getTime(),
-    fs.statSync(testFile2).atime.getTime()
+    common.statFollowLinks(testFile).atime.getTime(),
+    common.statFollowLinks(testFile2).atime.getTime()
   );
 });
 
+test('accepts -d flag', t => {
+  const testFile = tmpFile(t);
+  const date = new Date('December 17, 1995 03:24:00');
+  const result = shell.touch({ '-d': date }, testFile);
+  t.is(result.code, 0);
+  // Compare getTime(), because Date can't be compared with triple-equals.
+  t.is(common.statFollowLinks(testFile).mtime.getTime(), date.getTime());
+  t.is(common.statFollowLinks(testFile).atime.getTime(), date.getTime());
+});
+
+test('accepts long option (--date)', t => {
+  const testFile = tmpFile(t);
+  const someDate = new Date('December 17, 1995 03:24:00');
+  const result = shell.touch({ date: someDate }, testFile);
+  t.is(result.code, 0);
+  // Compare getTime(), because Date can't be compared with triple-equals.
+  t.is(common.statFollowLinks(testFile).mtime.getTime(), someDate.getTime());
+  t.is(common.statFollowLinks(testFile).atime.getTime(), someDate.getTime());
+});
+
 test('sets mtime and atime by default', t => {
   const testFile = tmpFile(t);
   const oldStat = resetUtimes(testFile);
   const result = shell.touch(testFile);
   t.is(result.code, 0);
-  t.truthy(oldStat.mtime < fs.statSync(testFile).mtime);
-  t.truthy(oldStat.atime < fs.statSync(testFile).atime);
+  t.truthy(oldStat.mtime < common.statFollowLinks(testFile).mtime);
+  t.truthy(oldStat.atime < common.statFollowLinks(testFile).atime);
 });
 
 test('does not set mtime if told not to', t => {
@@ -132,7 +153,7 @@ test('does not set mtime if told not to', t => {
   const oldStat = resetUtimes(testFile);
   const result = shell.touch('-a', testFile);
   t.is(result.code, 0);
-  t.is(oldStat.mtime.getTime(), fs.statSync(testFile).mtime.getTime());
+  t.is(oldStat.mtime.getTime(), common.statFollowLinks(testFile).mtime.getTime());
 });
 
 test('does not set atime if told not to', t => {
@@ -140,7 +161,7 @@ test('does not set atime if told not to', t => {
   const oldStat = resetUtimes(testFile);
   const result = shell.touch('-m', testFile);
   t.is(result.code, 0);
-  t.is(oldStat.atime.getTime(), fs.statSync(testFile).atime.getTime());
+  t.is(oldStat.atime.getTime(), common.statFollowLinks(testFile).atime.getTime());
 });
 
 test('multiple files', t => {
@@ -164,11 +185,11 @@ test('file array', t => {
 });
 
 test('touching broken link creates a new file', t => {
-  if (process.platform !== 'win32') {
-    const result = shell.touch('resources/badlink');
+  utils.skipOnWin(t, () => {
+    shell.ln('-s', 'not_existed_file', `${t.context.tmp}/badlink2`);
+    const result = shell.touch(`${t.context.tmp}/badlink2`);
     t.is(result.code, 0);
     t.falsy(shell.error());
-    t.truthy(fs.existsSync('resources/not_existed_file'));
-    shell.rm('resources/not_existed_file');
-  }
+    t.truthy(fs.existsSync(`${t.context.tmp}/not_existed_file`));
+  });
 });
diff --git a/test/uniq.js b/test/uniq.js
index ef4fad70f..72611df83 100644
--- a/test/uniq.js
+++ b/test/uniq.js
@@ -1,8 +1,9 @@
-import fs from 'fs';
+const fs = require('fs');
 
-import test from 'ava';
+const test = require('ava');
 
-import shell from '..';
+const shell = require('..');
+const common = require('../src/common');
 
 shell.config.silent = true;
 
@@ -18,63 +19,86 @@ test('no args', t => {
 
 test('file does not exist', t => {
   t.falsy(fs.existsSync('/asdfasdf')); // sanity check
-  const result = shell.sort('/adsfasdf');
+  const result = shell.uniq('/asdfasdf');
   t.truthy(shell.error());
   t.truthy(result.code);
 });
 
+test('directory', t => {
+  t.truthy(common.statFollowLinks('test/resources/').isDirectory()); // sanity check
+  const result = shell.uniq('test/resources/');
+  t.truthy(shell.error());
+  t.is(result.code, 1);
+  t.is(result.stderr, "uniq: error reading 'test/resources/'");
+});
+
+test('output directory', t => {
+  t.truthy(common.statFollowLinks('test/resources/').isDirectory()); // sanity check
+  const result = shell.uniq('test/resources/file1.txt', 'test/resources/');
+  t.truthy(shell.error());
+  t.is(result.code, 1);
+  t.is(result.stderr, 'uniq: test/resources/: Is a directory');
+});
+
+test('file does not exist with output directory', t => {
+  t.falsy(fs.existsSync('/asdfasdf')); // sanity check
+  const result = shell.uniq('/asdfasdf', 'test/resources/');
+  t.is(result.code, 1);
+  t.truthy(shell.error());
+});
+
 //
 // Valids
 //
 
 test('uniq file1', t => {
-  const result = shell.uniq('resources/uniq/file1');
+  const result = shell.uniq('test/resources/uniq/file1');
   t.falsy(shell.error());
   t.is(result.code, 0);
-  t.is(result.toString(), shell.cat('resources/uniq/file1u').toString());
+  t.is(result.toString(), shell.cat('test/resources/uniq/file1u').toString());
 });
 
 test('uniq -i file2', t => {
-  const result = shell.uniq('-i', 'resources/uniq/file2');
+  const result = shell.uniq('-i', 'test/resources/uniq/file2');
   t.falsy(shell.error());
   t.is(result.code, 0);
-  t.is(result.toString(), shell.cat('resources/uniq/file2u').toString());
+  t.is(result.toString(), shell.cat('test/resources/uniq/file2u').toString());
 });
 
 test('with glob character', t => {
-  const result = shell.uniq('-i', 'resources/uniq/fi?e2');
+  const result = shell.uniq('-i', 'test/resources/uniq/fi?e2');
   t.falsy(shell.error());
   t.is(result.code, 0);
-  t.is(result.toString(), shell.cat('resources/uniq/file2u').toString());
+  t.is(result.toString(), shell.cat('test/resources/uniq/file2u').toString());
 });
 
 test('uniq file1 file2', t => {
-  const result = shell.uniq('resources/uniq/file1', 'resources/uniq/file1t');
+  const result = shell.uniq('test/resources/uniq/file1', 'test/resources/uniq/file1t');
   t.falsy(shell.error());
   t.is(result.code, 0);
   t.is(
-    shell.cat('resources/uniq/file1u').toString(),
-    shell.cat('resources/uniq/file1t').toString()
+    shell.cat('test/resources/uniq/file1u').toString(),
+    shell.cat('test/resources/uniq/file1t').toString()
   );
 });
 
 test('cat file1 |uniq', t => {
-  const result = shell.cat('resources/uniq/file1').uniq();
+  const result = shell.cat('test/resources/uniq/file1').uniq();
   t.falsy(shell.error());
   t.is(result.code, 0);
-  t.is(result.toString(), shell.cat('resources/uniq/file1u').toString());
+  t.is(result.toString(), shell.cat('test/resources/uniq/file1u').toString());
 });
 
 test('uniq -c file1', t => {
-  const result = shell.uniq('-c', 'resources/uniq/file1');
+  const result = shell.uniq('-c', 'test/resources/uniq/file1');
   t.falsy(shell.error());
   t.is(result.code, 0);
-  t.is(result.toString(), shell.cat('resources/uniq/file1c').toString());
+  t.is(result.toString(), shell.cat('test/resources/uniq/file1c').toString());
 });
 
 test('uniq -d file1', t => {
-  const result = shell.uniq('-d', 'resources/uniq/file1');
+  const result = shell.uniq('-d', 'test/resources/uniq/file1');
   t.falsy(shell.error());
   t.is(result.code, 0);
-  t.is(result.toString(), shell.cat('resources/uniq/file1d').toString());
+  t.is(result.toString(), shell.cat('test/resources/uniq/file1d').toString());
 });
diff --git a/test/utils/mocks.js b/test/utils/mocks.js
new file mode 100644
index 000000000..a55e6d298
--- /dev/null
+++ b/test/utils/mocks.js
@@ -0,0 +1,68 @@
+function addToString(str, val) {
+  if (Buffer.isBuffer(val)) {
+    return str + val.toString();
+  }
+  return str + val;
+}
+
+function joinData(data) {
+  return data.reduce(addToString, '');
+}
+
+function wrapWrite(target) {
+  return function write(val) {
+    target.push(val);
+    return true;
+  };
+}
+
+const stdout = {
+  original: process.stdout.write,
+  value: [],
+  init: function init() {
+    this.value = [];
+    process.stdout.write = wrapWrite(this.value);
+  },
+  restore: function restore() {
+    process.stdout.write = this.original;
+  },
+  getValue: function getValue() {
+    return joinData(this.value);
+  }
+};
+
+const stderr = {
+  original: process.stderr.write,
+  value: [],
+  init: function init() {
+    this.value = [];
+    process.stderr.write = wrapWrite(this.value);
+  },
+  restore: function restore() {
+    process.stderr.write = this.original;
+  },
+  getValue: function getValue() {
+    return joinData(this.value);
+  }
+};
+
+const exit = {
+  original: process.exit,
+  value: undefined,
+  init: function init() {
+    this.value = undefined;
+    process.exit = (newCode) => {
+      this.value = newCode;
+    };
+  },
+  restore: function restore() {
+    process.exit = this.original;
+  },
+  getValue: function getValue() {
+    return this.value;
+  }
+};
+
+exports.stdout = stdout;
+exports.stderr = stderr;
+exports.exit = exit;
diff --git a/test/utils/utils.js b/test/utils/utils.js
index 814f82b87..9c20e5db3 100644
--- a/test/utils/utils.js
+++ b/test/utils/utils.js
@@ -1,7 +1,14 @@
 const child = require('child_process');
+const path = require('path');
+const { promisify } = require('node:util');
+
+const chalk = require('chalk');
 
 const common = require('../../src/common');
 
+// Capture process.stderr.write, otherwise we have a conflict with mocks.js
+const _processStderrWrite = process.stderr.write.bind(process.stderr);
+
 function numLines(str) {
   return typeof str === 'string' ? (str.match(/\n/g) || []).length + 1 : 0;
 }
@@ -20,19 +27,50 @@ function skipOnWinForEPERM(action, testCase) {
   const error = ret.code;
   const isWindows = process.platform === 'win32';
   if (isWindows && error && /EPERM:/.test(error)) {
-    console.warn('Got EPERM when testing symlinks on Windows. Assuming non-admin environment and skipping test.');
+    _processStderrWrite('Got EPERM when testing symlinks on Windows. Assuming non-admin environment and skipping test.\n');
   } else {
     testCase();
   }
 }
 exports.skipOnWinForEPERM = skipOnWinForEPERM;
 
-function runScript(script, cb) {
-  child.execFile(common.config.execPath, ['-e', script], cb);
+function runScript(script) {
+  const promiseExec = promisify(child.execFile);
+  return promiseExec(common.config.execPath, ['-e', script]);
 }
 exports.runScript = runScript;
 
 function sleep(time) {
-  child.execFileSync(common.config.execPath, ['resources/exec/slow.js', time.toString()]);
+  const testDirectoryPath = path.dirname(__dirname);
+  child.execFileSync(common.config.execPath, [
+    path.join(testDirectoryPath, 'resources', 'exec', 'slow.js'),
+    time.toString(),
+  ]);
 }
 exports.sleep = sleep;
+
+function mkfifo(dir) {
+  if (process.platform !== 'win32') {
+    const fifo = dir + 'fifo';
+    child.execFileSync('mkfifo', [fifo]);
+    return fifo;
+  }
+  return null;
+}
+exports.mkfifo = mkfifo;
+
+function skipIfTrue(booleanValue, t, closure) {
+  if (booleanValue) {
+    _processStderrWrite(
+      chalk.yellow('Warning: skipping platform-dependent test ') +
+      chalk.bold.white(`'${t.title}'`) +
+      '\n'
+    );
+    t.truthy(true); // dummy assertion to satisfy ava v0.19+
+  } else {
+    closure();
+  }
+}
+
+exports.skipOnUnix = skipIfTrue.bind(module.exports, process.platform !== 'win32');
+exports.skipOnWin = skipIfTrue.bind(module.exports, process.platform === 'win32');
diff --git a/test/which.js b/test/which.js
index 13b92c7bf..c49eb06d4 100644
--- a/test/which.js
+++ b/test/which.js
@@ -1,8 +1,10 @@
-import fs from 'fs';
+const fs = require('fs');
+const path = require('path');
 
-import test from 'ava';
+const test = require('ava');
 
-import shell from '..';
+const shell = require('..');
+const utils = require('./utils/utils');
 
 shell.config.silent = true;
 
@@ -35,7 +37,7 @@ test('basic usage', t => {
 });
 
 test('Windows can search with or without a .exe extension', t => {
-  if (process.platform === 'win32') {
+  utils.skipOnUnix(t, () => {
     // This should be equivalent on Windows
     const node = shell.which('node');
     const nodeExe = shell.which('node.exe');
@@ -43,5 +45,52 @@ test('Windows can search with or without a .exe extension', t => {
     // If the paths are equal, then this file *should* exist, since that's
     // already been checked.
     t.is(node.toString(), nodeExe.toString());
-  }
+  });
+});
+
+test('Searching with -a flag returns an array', t => {
+  const commandName = 'node'; // Should be an existing command
+  const result = shell.which('-a', commandName);
+  t.falsy(shell.error());
+  t.truthy(result);
+  t.not(result.length, 0);
+});
+
+test('Searching with -a flag for not existing command returns an empty array', t => {
+  const notExist = '6ef25c13209cb28ae465852508cc3a8f3dcdc71bc7bcf8c38379ba38me';
+  const result = shell.which('-a', notExist);
+  t.falsy(shell.error());
+  t.is(result.length, 0);
+});
+
+test('Searching with -a flag returns an array with first item equals to the regular search', t => {
+  const commandName = 'node'; // Should be an existing command
+  const resultForWhich = shell.which(commandName);
+  const resultForWhichA = shell.which('-a', commandName);
+  t.falsy(shell.error());
+  t.truthy(resultForWhich);
+  t.truthy(resultForWhichA);
+  t.is(resultForWhich.toString(), resultForWhichA[0]);
+});
+
+test('None executable files does not appear in the result list', t => {
+  const commandName = 'node'; // Should be an existing command
+  const extraPath = path.resolve(__dirname, 'resources', 'which');
+  const matchingFile = path.resolve(extraPath, commandName);
+  const pathEnv = process.env.PATH;
+
+  // make sure that file is exists (will throw error otherwise)
+  t.truthy(fs.existsSync(matchingFile));
+
+  process.env.PATH = extraPath + path.delimiter + process.env.PATH;
+  const resultForWhich = shell.which(commandName);
+  const resultForWhichA = shell.which('-a', commandName);
+  t.falsy(shell.error());
+  t.truthy(resultForWhich);
+  t.truthy(resultForWhichA);
+  t.truthy(resultForWhichA.length);
+  t.not(resultForWhich.toString(), matchingFile);
+  t.falsy(resultForWhichA.includes(matchingFile));
+
+  process.env.PATH = pathEnv;
 });