Module 3 - Bash scripting

Lab 1: System Health Check Script

• How do you write a script (system_health.sh) that checks CPU, memory, and disk usage?

• How do you log the output to /var/log/sys-health.log?

• How do you make the script print “System Healthy” when all values are under 80%?

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Lab 2: Log File Analyzer

• How do you write a script (log_analyzer.sh) that reads /var/log/syslog?

• How do you print the top 10 most repeated error messages?

• How do you save the results to log_report.txt?

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Lab 3: Backup Automation Script

• How do you write a script (backup.sh) that compresses a directory into a .tar.gz file?

• How do you store the backup in /backup/ with a timestamp?

• How do you delete backups older than 7 days?

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Lab 4: User Management Script

• How do you write a script (create_user.sh) that accepts a username as input?

• How do you create the user and the group devops if it does not exist?

• How do you add the user to the devops group?

• How do you force the user to change their password on first login?

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Lab 5: Process Monitoring Script

• How do you write a script (monitor_process.sh) that checks whether a given process is running?

• How do you restart the process automatically if it is not running?

• How do you log all restart attempts?

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Lab 6: Menu-Driven Utility Script

• How do you create a menu script (menu.sh) with options to:

  • Show current date

  • Show running processes

  • Show disk usage

  • Show memory usage

  • Exit

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Lab 7: File Organizer Script

• How do you write a script (organize_files.sh) that scans a directory?

• How do you move files into folders based on file extensions (txt, log, jpg)?

• How do you automatically create folders if they do not exist?

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Lab 8: Find & Replace Automation

• How do you write a script (replace.sh) that accepts:

  • A filename

  • A search term

  • A replacement term

• How do you replace all occurrences in the file?

• How do you print the number of lines modified?

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Lab 9: Cron Job Setup Script

• How do you write a script (setup_cron.sh) that creates a cron job running every 5 minutes?

• How do you configure it to run health.sh and log output to /var/log/health.log?

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Lab 10: Automation Script for Server Info

• How do you write a script (server_info.sh) that displays:

  • OS version

  • Kernel version

  • IP address

  • Uptime

  • Last 5 logins

• How do you save this information into a timestamped file in /tmp/server-info/?