Shell Scripts

A collection of practical Bash scripting projects, exercises, and reference materials covering Linux automation, system administration, log analysis, backup automation, scheduling, and shell scripting fundamentals.

Overview

This repository documents my hands-on journey learning Bash scripting through real-world projects and automation tasks. The scripts focus on practical Linux administration, DevOps automation, error handling, reporting, and system maintenance.

Repository Structure

Shell-Scripts/
├── Shell Scripting Basics/
├── Shell Scripting Loops Arguments Error Handling/
├── Shell Scripting Functions intermediate Concepts/
├── Shell Scripting Project Log Rotation Backup Crontab/
├── Bash Scripting Challenge Log Analyzer and Report/
├── Shell Scripting Cheat Sheet Build Your Own Reference Guide/
└── README.md

Topics Covered

Shell Scripting Basics

• Shebang and script execution
• Variables and quoting
• User input handling
• Conditional statements
• File operations
• Service status checks

Loops, Arguments & Error Handling

• For loops
• While loops
• Command-line arguments
• Package installation automation
• Error handling techniques
• Root privilege validation

Functions & Intermediate Concepts

• Function creation and usage
• Function arguments
• Return values
• Local variables
• Strict mode (set -euo pipefail)
• System information reporting

Log Rotation, Backup & Crontab

• Automated log rotation
• Backup automation
• Archive management
• Scheduled maintenance
• Cron job configuration
• Production-style automation

Log Analyzer & Report Generator

• Log file validation
• Error detection
• Critical event extraction
• Error statistics
• Report generation
• Linux text processing tools

Shell Scripting Cheat Sheet

• Bash syntax reference
• Loops and conditionals
• Functions
• Text processing commands
• Error handling
• DevOps one-liners

Projects Included

System Information Reporter

Collects and displays:

• Hostname and OS information
• System uptime
• Disk usage statistics
• Memory utilization
• Top CPU-consuming processes

Package Installation Automation

Automatically:

• Checks installed packages
• Installs missing packages
• Validates root privileges
• Reports installation status

Log Rotation Utility

Features:

• Compresses old log files
• Removes outdated archives
• Tracks processed files
• Provides execution reports

Backup Automation Script

Features:

• Creates timestamped backups
• Verifies archive integrity
• Cleans up old backups
• Reports backup statistics

Maintenance Automation

Combines:

• Log rotation
• Backup operations
• Timestamped logging
• Cron scheduling

Log Analyzer

Provides:

• Error counting
• Critical event detection
• Top error summaries
• Daily report generation

Skills Demonstrated

• Bash Scripting
• Linux Administration
• Process Automation
• Log Analysis
• Backup Management
• Task Scheduling
• Text Processing
• Error Handling
• System Monitoring
• DevOps Fundamentals

Tools Used

• Bash
• grep
• awk
• sed
• cut
• sort
• uniq
• find
• tar
• gzip
• cron
• systemctl
• df
• free
• ps

Learning Outcomes

Through these projects I gained practical experience with:

• Writing modular and maintainable Bash scripts
• Automating repetitive Linux administration tasks
• Processing and analyzing log files
• Implementing backup and recovery procedures
• Creating scheduled maintenance workflows
• Applying production-safe scripting practices
• Using Linux text-processing utilities effectively

Author

Khalid Khan

Linux System Administrator | DevOps Engineer

GitHub: https://github.com/krmaryum

LinkedIn: https://www.linkedin.com/in/khalid-khan-93760a360

License

This repository is created for learning, practice, and demonstration purposes.