Bash Scripting Project – Summary by Days

This repository contains a set of Bash scripts created across multiple days as part of a learning and automation project.
Each “day” includes one or more scripts demonstrating key Bash skills — loops, conditionals, file operations, process management, and automation.

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Day 1 – Explorer & Backup Rotation

explorer.sh

An interactive script that lists files and directories in the current working directory.
It displays file names with their sizes and allows the user to enter text lines to count characters interactively.

Key skills:

• ls, awk, read, while, and string length operations in Bash.

backup_script.sh

Creates timestamped compressed backups (.tar.gz) of a given directory and automatically deletes older ones, keeping only the last three.

Key skills:

• tar archiving
• Filename timestamping with date
• Conditional checks and array manipulation for rotation

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Day 2 – User Management

user_management.sh

Manages Linux users from the command line — allows creation, deletion, listing, and password reset using flags.

Key skills:

• Command-line argument parsing
• System administration commands (useradd, userdel, passwd)
• Input validation and error handling

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Day 3 – Process and System Monitoring

monitor_process.sh

Checks whether a given process (service) is running using pgrep.
If it isn’t, the script tries to start it automatically up to three times with systemctl.

Key skills:

• Process management with pgrep and systemctl
• Conditional retries and error handling

monitor_script.sh

Provides an interactive menu to monitor system resource usage (CPU, memory, disk) and check or start specific services.

Key skills:

• Reading user input in menus
• Using top, free, and df for system stats
• Service management with systemctl

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Day 4 - Analyze System Log Files

log_analyzer.sh

Analyzes system log files to find error and critical messages, count occurrences, and create summary reports.
Optionally archives the report after analysis.

Key skills:

• Text processing with grep, awk, and sort
• Pattern matching and file archiving with tar
• Report generation with timestamps

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Day 5 – Restaurant Order System

restaurant_order.sh

A fun interactive script that simulates a restaurant ordering system.
Reads menu items from menu.txt, validates orders, and calculates the total bill.

Key skills:

• Working with associative arrays in Bash
• File reading and string parsing
• Arithmetic operations and user input validation

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Summary of Learned Topics

Topic	Covered In
File handling, I/O loops	Explorer, Log Analyzer
Archiving & backups	Backup Rotation
Process management	Process Monitor
Resource monitoring	System Monitor
Text parsing with grep/awk/sed	Log Analyzer
Arrays and user input	Restaurant Order
System administration basics	User Manager

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