From 2a6df3d431e16a0b153cec1df8247b1031b3e72a Mon Sep 17 00:00:00 2001
From: Dibyajyoti Panda <dbjpanda@live.com>
Date: Mon, 18 Jun 2018 02:42:49 +0530
Subject: [PATCH 1/2] Update container-run.md

Added an example for executing command on running container.
---
 docs/cookbook/container-run.md | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/docs/cookbook/container-run.md b/docs/cookbook/container-run.md
index 0820e80a..6876d79e 100644
--- a/docs/cookbook/container-run.md
+++ b/docs/cookbook/container-run.md
@@ -208,3 +208,29 @@ $hostConfig->setPortBindings($portMap);
 
 $containerConfig->setHostConfig($hostConfig);
 ```
+
+## Executing a command on a running container 
+
+This example shows how you can execute an command on any running container. It is same as `docker exec CONTAINER_ID some_command `.
+
+```php
+<?php
+use Docker\Docker;
+use Docker\API\Model\ContainersIdExecPostBody;
+use Docker\API\Model\ExecIdStartPostBody;
+
+$docker = Docker::create();
+
+$execConfig = new ContainersIdExecPostBody();
+$execConfig->setTty(true);
+$execConfig->setAttachStdout(true);
+$execConfig->setAttachStderr(true);
+$execConfig->setCmd(['mkdir', '/tmp/testDir']);
+
+$execid = $docker->containerExec('android',$execConfig)->getId();
+$execStartConfig = new ExecIdStartPostBody();
+$execStartConfig->setDetach(false);
+$output = $docker->execStart($execid,$execStartConfig);
+
+var_dump($output);
+```

From bbc493426d853581bc4aa73dc95b323fb05606d7 Mon Sep 17 00:00:00 2001
From: Dibyajyoti Panda <dbjpanda@live.com>
Date: Mon, 18 Jun 2018 03:14:54 +0530
Subject: [PATCH 2/2] Update container-run.md

---
 docs/cookbook/container-run.md | 19 +++++++++++++++++--
 1 file changed, 17 insertions(+), 2 deletions(-)

diff --git a/docs/cookbook/container-run.md b/docs/cookbook/container-run.md
index 6876d79e..2ee824bf 100644
--- a/docs/cookbook/container-run.md
+++ b/docs/cookbook/container-run.md
@@ -230,7 +230,22 @@ $execConfig->setCmd(['mkdir', '/tmp/testDir']);
 $execid = $docker->containerExec('android',$execConfig)->getId();
 $execStartConfig = new ExecIdStartPostBody();
 $execStartConfig->setDetach(false);
-$output = $docker->execStart($execid,$execStartConfig);
 
-var_dump($output);
+// Execute the command 
+$stream = $docker->execStart($execid,$execStartConfig);
+
+// To see the output stream of the 'exec' command
+$stdoutText = "";
+$stderrText = "";
+
+$stream->onStdout(function ($stdout) use (&$stdoutText) {
+    $stdoutText .= $stdout;
+});
+
+$stream->onStderr(function ($stderr) use (&$stderrText) {
+    $stderrText .= $stderr;
+});
+
+$stream->wait();
+var_dump([ "stdout" => $stdoutText, "stderr" => $stderrText ]) ;
 ```