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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  • Removes outdated archives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.