Script 1: Monitor CPU Usage

#!/bin/bash
# Display CPU usage every 5 seconds

echo "Monitoring CPU usage..."
while true; do
    echo "-------------------------"
    echo "$(date)"
    top -bn1 | grep "Cpu(s)"
    sleep 5
done

Benefit:

• Real-time CPU usage monitoring

• Can be stopped anytime with Ctrl+C

Script 2: Monitor Memory Usage

#!/bin/bash
# Check free and used memory

echo "Memory status:"
free -h
echo "Top 5 memory-consuming processes:"
ps aux --sort=-%mem | head -n 6

Benefit:

• Quickly identify memory usage and top memory-consuming processes

• Useful for diagnosing slow systems

Script 3: List Large Files

#!/bin/bash
# Find files larger than 100MB in home directory

echo "Searching for files larger than 100MB..."
find $HOME -type f -size +100M -exec ls -lh {} \; | awk '{ print $9 ": " $5 }'

Benefit:

• Identify large files taking unnecessary space

• Helps clean up disk space efficiently

Script 4: Monitor Running Processes

#!/bin/bash
# List top CPU-consuming processes

echo "Top CPU-consuming processes:"
ps -eo pid,ppid,cmd,%mem,%cpu --sort=-%cpu | head -n 11

Benefit:

• Quickly see which processes are consuming the most CPU

• Useful for server performance monitoring

Script 5: Automatic Cleanup

#!/bin/bash
# Remove old log files and cache

echo "Cleaning up old logs and cache..."
find /var/log -type f -name "*.log" -mtime +30 -exec rm -f {} \;
rm -rf ~/.cache/*
echo "Cleanup completed!"

Benefit:

• Keeps logs and cache from filling up disk

• Can be automated with cron weekly or monthly

Summary

These scripts help you:

1. Monitor CPU and memory usage

2. Identify large files and clean disk space

3. Check running processes for resource usage

4. Automate cleanup tasks