25 Bash Scripts For Engineers

1. Hello World Script

• Prints “Hello, World!” to the terminal.

#!/bin/bash
echo "Hello, World!"

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2. System Info Script

• Displays system information like hostname, kernel version, and uptime.

#!/bin/bash
echo "Hostname: $(hostname)"
echo "Kernel Version: $(uname -r)"
echo "Uptime: $(uptime -p)"

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3. Backup Script

• Creates a backup of a specified directory.

#!/bin/bash
src="/path/to/source"
dest="/path/to/backup"
tar -czvf "$dest/backup_$(date +%Y%m%d).tar.gz" "$src"

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4. Disk Usage Script

• Checks disk usage and alerts if it exceeds a threshold.

#!/bin/bash
threshold=80
usage=$(df / | tail -1 | awk '{print $5}' | sed 's/%//')
if [ "$usage" -gt "$threshold" ]; then
  echo "Warning: Disk usage is above $threshold%"
fi

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5. Find and Replace Script

• Finds and replaces text in files.

#!/bin/bash
find . -type f -name "*.txt" -exec sed -i 's/old_text/new_text/g' {} +

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6. Process Monitor Script

• Checks if a process is running and restarts it if not.

#!/bin/bash
process="nginx"
if ! pgrep -x "$process" > /dev/null; then
  echo "$process is not running. Restarting..."
  systemctl start "$process"
fi

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7. Password Generator Script

• Generates a random password of specified length.

#!/bin/bash
length=12
echo "$(tr -dc A-Za-z0-9 </dev/urandom | head -c $length)"

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8. Cleanup Script

• Deletes files older than a certain number of days.

#!/bin/bash
find /path/to/directory -type f -mtime +30 -delete

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9. Weather Checker Script

• Fetches the current weather using an API.

#!/bin/bash
api_key="your_api_key"
location="New York"
curl -s "http://api.openweathermap.org/data/2.5/weather?q=$location&appid=$api_key" | jq '.weather[0].description'

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10. Log File Analyzer Script

• Extracts specific information from log files.

#!/bin/bash
grep "ERROR" /var/log/syslog | tail -10

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11. File Organizer Script

• Moves files into directories based on extensions.

#!/bin/bash
for file in *; do
  ext="${file##*.}"
  mkdir -p "$ext"
  mv "$file" "$ext/"
done

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12. Reminder Script

• Sends a notification or reminder at a specific time.

#!/bin/bash
echo "Don't forget to take a break!" | at 14:00

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13. Internet Speed Test Script

• Measures internet speed using speedtest-cli.

#!/bin/bash
speedtest-cli

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14. Directory Size Script

• Displays the size of a directory.

#!/bin/bash
du -sh /path/to/directory

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15. Auto-Updater Script

• Updates system packages.

#!/bin/bash
sudo apt update && sudo apt upgrade -y

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16. Screenshot Taker Script

• Takes a screenshot and saves it.

#!/bin/bash
scrot ~/Pictures/screenshot_$(date +%Y%m%d_%H%M%S).png

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17. Port Checker Script

• Checks if a port is open.

#!/bin/bash
port=80
if nc -zv localhost $port; then
  echo "Port $port is open."
else
  echo "Port $port is closed."
fi

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18. Todo List Script

• Manages a simple todo list.

#!/bin/bash
echo "1. Add a task"
echo "2. View tasks"
read choice
if [ "$choice" -eq 1 ]; then
  echo "Enter task:" >> todo.txt
elif [ "$choice" -eq 2 ]; then
  cat todo.txt
fi

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19. Archive Extractor Script

• Extracts files from tar.gz archives.

#!/bin/bash
tar -xzvf archive.tar.gz

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20. Service Status Script

• Checks the status of a service.

#!/bin/bash
service="nginx"
systemctl status "$service"

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21. Battery Status Script

• Displays the battery status of a laptop.

#!/bin/bash
acpi -b

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22. System Resource Monitor Script

• Displays CPU and memory usage.

#!/bin/bash
echo "CPU Usage: $(top -bn1 | grep "Cpu(s)" | awk '{print $2 + $4}')%"
echo "Memory Usage: $(free -m | awk 'NR==2{printf "%.2f", $3*100/$2 }')%"

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23. IP Address Checker Script

• Shows the public and private IP addresses.

#!/bin/bash
echo "Public IP: $(curl -s ifconfig.me)"
echo "Private IP: $(hostname -I)"

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24. File Downloader Script

• Downloads files using wget.

#!/bin/bash
url="https://example.com/file.zip"
wget "$url"

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25. Schedule Cron Job Script

• Automates scheduling of a cron job.

#!/bin/bash
echo "0 2 * * * /path/to/script.sh" | crontab -

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Conclusion

The 25 Bash scripts outlined above demonstrate the immense flexibility and practicality of Bash scripting for everyday tasks. From automating backups and monitoring system resources to generating passwords and managing files, these scripts can significantly enhance productivity and save time.

By mastering Bash scripting, you gain the ability to automate complex workflows, reduce human error, and customize solutions tailored to your specific needs. Whether you’re a beginner or an experienced user, these scripts serve as a foundation for building more advanced and robust solutions. Start experimenting with these examples, and you’ll quickly discover the endless possibilities that Bash scripting offers.