Advanced Bash Scripting Examples for Ubuntu

Here are some powerful Bash scripting examples that will take your Ubuntu terminal skills to the next level:

1. System Monitoring Script

bash

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#!/bin/bash

# System Monitor
echo "===== SYSTEM MONITOR ====="
echo "Date: $(date)"
echo "Uptime: $(uptime -p)"
echo "CPU Load: $(uptime | awk -F'load average: ' '{print $2}')"
echo "Memory Usage: $(free -h | grep Mem | awk '{print $3"/"$2}')"
echo "Disk Usage: $(df -h / | tail -1 | awk '{print $5}')"

Usage:

1. Save as monitor.sh

2. chmod +x monitor.sh

3. Run with ./monitor.sh

2. Automated Backup Script

bash

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#!/bin/bash

# Auto Backup
BACKUP_DIR="/backups"
SOURCE_DIR="$HOME/Documents"
DATE=$(date +%Y-%m-%d)

mkdir -p $BACKUP_DIR
tar -czf "$BACKUP_DIR/backup_$DATE.tar.gz" "$SOURCE_DIR"
echo "Backup created: $BACKUP_DIR/backup_$DATE.tar.gz"

Usage:

1. Save as backup.sh

2. Make executable (chmod +x backup.sh)

3. Run daily with cron

3. Network Scanner

bash

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#!/bin/bash

# Network Scanner
echo "Scanning local network..."
for ip in 192.168.1.{1..254}; do
    ping -c 1 -W 1 $ip &>/dev/null && echo "$ip is UP"
done

Usage:

1. Save as netscan.sh

2. chmod +x netscan.sh

3. Run with sudo ./netscan.sh

4. File Organizer

bash

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#!/bin/bash

# File Organizer
for file in *; do
    if [[ -f "$file" ]]; then
        ext="${file##*.}"
        mkdir -p "$ext"
        mv "$file" "$ext/"
    fi
done

Usage:

1. Save as organizer.sh

2. chmod +x organizer.sh

3. Run in any directory to sort files by extension

5. Password Generator

bash

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#!/bin/bash

# Password Generator
length=12
echo "Generating $length-character password:"
tr -dc 'A-Za-z0-9!@#$%^&*()' < /dev/urandom | head -c $length
echo

Usage:

1. Save as passgen.sh

2. chmod +x passgen.sh

3. Run with ./passgen.sh

6. Log File Analyzer

bash

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#!/bin/bash

# Log Analyzer
logfile="/var/log/syslog"
echo "Top 10 IPs in $logfile:"
grep -o '[0-9]\{1,3\}\.[0-9]\{1,3\}\.[0-9]\{1,3\}\.[0-9]\{1,3\}' $logfile | sort | uniq -c | sort -nr | head

Usage:

1. Save as loganalyzer.sh

2. chmod +x loganalyzer.sh

3. Run with sudo ./loganalyzer.sh

7. Automated Updates

bash

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#!/bin/bash

# System Updater
echo "Starting system update..."
sudo apt update
sudo apt upgrade -y
sudo apt autoremove -y
echo "Update complete!"

Usage:

1. Save as update.sh

2. chmod +x update.sh

3. Run weekly with cron

8. Weather Checker

bash

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#!/bin/bash

# Weather Check
city=${1:-London}
curl -s "wttr.in/$city?0"

Usage:

1. Save as weather.sh

2. chmod +x weather.sh

3. Run with ./weather.sh Paris

9. SSH Connection Manager

bash

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#!/bin/bash

# SSH Manager
echo "Available servers:"
echo "1) Web Server (user@192.168.1.10)"
echo "2) Database (user@192.168.1.20)"
read -p "Choose server: " choice

case $choice in
    1) ssh user@192.168.1.10 ;;
    2) ssh user@192.168.1.20 ;;
    *) echo "Invalid choice" ;;
esac

Usage:

1. Save as ssh-manager.sh

2. chmod +x ssh-manager.sh

3. Run with ./ssh-manager.sh

10. Disk Space Alert

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#!/bin/bash

# Disk Space Monitor
THRESHOLD=90
CURRENT=$(df / | grep / | awk '{print $5}' | sed 's/%//g')

if [ "$CURRENT" -gt "$THRESHOLD" ]; then
    echo "Warning: Disk space is at ${CURRENT}%!" | mail -s "Disk Alert" admin@example.com
fi

Usage:

1. Save as disk-alert.sh

2. chmod +x disk-alert.sh

3. Add to cron for daily checks

Bonus: Make Scripts Executable Everywhere

bash

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# Add to ~/.bashrc
export PATH=$PATH:~/scripts

Then store all scripts in ~/scripts and run them from anywhere!

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Next Steps

• Learn about cron for scheduling (crontab -e)

• Explore awk and sed for text processing

• Study grep with regular expressions

• Try making interactive scripts with read

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