#!/bin/bash

# 1. Capture date and time

DATE=$(date '+%Y-%m-%d %H:%M:%S')

TIMESTAMP=$(date '+%Y%m%d_%H%M%S')

# 2. Define directory and file path

OUTPUT_DIR="/tmp/CPU_Utilization"

OUTPUT_FILE="$OUTPUT_DIR/CPU_Utilization_$TIMESTAMP.txt"

# 3. Check if the directory exists, if not create it

if [ ! -d "$OUTPUT_DIR" ]; then

mkdir -p "$OUTPUT_DIR"

fi

# 4. Capture hostname

HOSTNAME=$(hostname)

# 5. Capture CPU utilization using 'top' command

CPU_USAGE_TOP=$(top -b -n1 | grep "Cpu(s)" | awk '{print $2 + $4}')

# 6. Capture CPU utilization using 'vmstat' command

CPU_USAGE_VMSTAT=$(vmstat 1 2 | tail -1 | awk '{print $13+$14}')

# 7. Capture per-core CPU usage using 'mpstat' command (from sysstat package)

MPSTAT_OUTPUT=$(mpstat -P ALL 1 1)

# 8. Capture detailed CPU statistics using 'iostat' command

IOSTAT_OUTPUT=$(iostat -c 1 1)

# 9. Read CPU utilization data directly from /proc/stat file

PROC_STAT=$(cat /proc/stat | grep '^cpu ' | awk '{usage=($2+$4)*100/($2+$4+$5)} END {print usage}')

# 10. Capture disk usage of the root '/' partition using 'df -h'

DISK_USAGE=$(df -h / | grep / | awk '{print $5}')

# 11. Capture memory usage using 'free' command

MEMORY_USAGE=$(free -h | grep "Mem:" | awk '{print "Total: "$2", Used: "$3", Free: "$4}')

# 12. Capture system uptime and load average using 'uptime'

UPTIME=$(uptime -p)

LOAD_AVG=$(uptime | awk -F'load average:' '{ print $2 }')

# 13. Capture number of active TCP connections using 'ss' (if installed) or 'netstat'

TCP_CONNECTIONS=$(ss -t | wc -l)

# 14. Capture number of running processes using 'ps'

RUNNING_PROCESSES=$(ps -e --no-headers | wc -l)

# 15. Capture top 5 memory-hogging processes

TOP_MEMORY_PROCESSES=$(ps aux --sort=-%mem | head -n 6)

# 16. Capture top 5 CPU-hogging processes

TOP_CPU_PROCESSES=$(ps aux --sort=-%cpu | head -n 6)

# 17. Calculate top 5 FIDs by total CPU utilization

TOP_FID_CPU=$(ps -eo user,%cpu --sort=-%cpu | awk '{cpu[$1]+=$2} END {for (u in cpu) print u, cpu[u]}' | sort -k2 -nr | head -n 5)

# 18. Write the information to both the output file and the console using 'tee'

{

echo "[$DATE] Hostname: $HOSTNAME"

echo "CPU Utilization (top): $CPU_USAGE_TOP%"

echo "CPU Utilization (vmstat): $CPU_USAGE_VMSTAT%"

echo "Disk Usage: $DISK_USAGE"

echo

echo "Memory Usage:"

echo "$MEMORY_USAGE"

echo

echo "Uptime: $UPTIME"

echo "Load Average: $LOAD_AVG"

echo

echo "Active TCP Connections: $TCP_CONNECTIONS"

echo "Number of Running Processes: $RUNNING_PROCESSES"

echo

echo "Top 5 Memory-Hogging Processes:"

echo "$TOP_MEMORY_PROCESSES"

echo

echo "Top 5 CPU-Hogging Processes:"

echo "$TOP_CPU_PROCESSES"

echo

echo "Per-core CPU Utilization (mpstat):"

echo "$MPSTAT_OUTPUT"

echo

echo "Detailed CPU stats (iostat):"

echo "$IOSTAT_OUTPUT"

echo

echo "CPU Usage from /proc/stat: $PROC_STAT%"

echo

echo "Top 5 FIDs by Total CPU Utilization:"

echo "FID, Total CPU%"

echo "$TOP_FID_CPU"

} | tee "$OUTPUT_FILE"

# Optional message to confirm that the output has been saved

echo "CPU utilization, memory, and other system information saved to $OUTPUT_FILE"