Shell-Scripts Collection

This repository contains collection of Bash scripts I created to automate DevOps tasks from basic to advanced

01. Scripting Basics

Focus: Fundamentals of Bash Script

• hello.sh: First script with Shebang usage.
• variables.sh: Understanding quotes and variable assignment.
• greet.sh: Handling user input via read.
• check_number.sh & file_check.sh : Logical conditions and if-else statements.
• server_check.sh: Basic service status automation.

02. Loops and Error Handling

Focus: Automation logic and script robustness.

• for_loop.sh: Iterating through lists and ranges.
• countdown.sh: Implementing while-loops.
• args_demo.sh: Using Command-Line Arguments ($1, $@, $#).
• install_packages.sh: Automating package installation with checks.
• safe_script.sh: Error handling using set -e and ||.

03. Functions and Strict Mode

Focus: Clean code and production-ready "Strict Mode."

• functions.sh: Reusable code blocks with arguments.
• disk_check.sh: System health checks within functions.
• strict_demo.sh: Mastering set -euo pipefail.
• system_info.sh: A comprehensive System Info Reporter tool.

04. Automation Projects

Focus: Real-world DevOps automation.

• log_rotate.sh: Cleaning up old logs and compressing files.
• backup.sh: Creating timestamped backups with auto-deletion of old archives.
• maintenance.sh: Scheduled task combining rotation and backups.

05. Log Analyzer Challenge

Focus: Advanced text processing and report generation.

• input.sh: Validates command-line arguments and verifies the existence of target log files.
• error_count.sh : Scans logs to calculate the total frequency of "ERROR" and "Failed" keywords.
• critical.sh: Extracts high-priority "CRITICAL" events with line numbers for rapid debugging.
• top_err.sh: Identifies the top 5 most frequent error messages
• log_analyzer_report.sh: A tool to parse logs, count errors, identify critical events using grep/awk, and generate an automated text report.

06. Cheat-Sheet