Bash Shell Scripting Collection

🚀 About This Repository

A comprehensive collection of Bash scripts demonstrating fundamental to advanced shell scripting concepts. This repository serves as both a learning resource and a practical reference for Linux/Unix shell scripting techniques. It includes both educational scripts covering core concepts and real-world practical projects for system administration tasks.

📋 Contents

This repository contains scripts covering:

• Basics: Basic syntax, comments, variables, and constants
• Data Structures: Arrays, key-value pairs, string operations
• Control Flow: If-else statements, case statements, logical operators
• Loops: For, while, until loops with various implementations
• Functions: Creation and usage with arguments
• File Operations: Reading from files, CSV processing
• System Management: Connectivity checks, file existence checks
• Debugging: Logging, error handling techniques
• Advanced Concepts: Background processing, redirection
• Real-world Projects: File archiving, system monitoring, user management

🗂️ Script Categories

Fundamentals

• 01_basic.sh - Hello world example
• 02_comments.sh - Single and multi-line comments
• 03_var.sh - Variable declaration and usage
• 04_constant_var.sh - Constants and readonly variables

Data Handling

• 05_array.sh - Array operations
• 06_keyvalues.sh - Key-value pair handling
• 07_string_ops.sh - String manipulation
• 08_user_int.sh - User input handling
• 09_arithmetic.sh - Mathematical operations

Control Structures

• 10_if_else.sh - Basic conditionals
• 11_elif.sh - Multiple condition handling
• 12_choice.sh - Case statements
• 13_logical.sh - AND/OR operators
• 14_ternary_ops.sh - Ternary operations

Loops

• 15_loops.sh - For loop basics
• 16_for_with_file.sh - File processing with loops
• 17_for-with_array.sh - Array iteration
• 18_while_loop.sh - While loop implementation
• 19_until_loop.sh - Until loop example
• 20_infinite_loop.sh - Infinite loop demonstrations
• 21_while_with_file.sh - File processing with while
• 23_while_with_csv.sh - CSV processing

Functions & Arguments

• 24_function.sh - Function definition and calling
• 25_func_with_args.sh - Function arguments
• 26-args.sh - Script arguments
• 27_shift_args.sh - Shift argument technique

System Operations

• 28_break.sh - Loop breaking
• 29_connectivity_check.sh - Network connectivity testing
• 30_file_exists_or_not.sh - File existence verification
• 31_random_dice.sh - Random number generation
• 32_root_user.sh - User privilege checking
• 33_redirect.sh - Output redirection
• 34_dev_null.sh - Discarding output
• 35_name_retrieve.sh - Script name retrieval

Advanced Techniques

• 36_logger.sh - System logging
• 37_debug.sh - Script debugging
• 38_debugging.sh - Error handling with set -e
• 39_running_background.sh - Background process execution

Practical Projects

• archieve_files.sh - Automatically archives large files (20MB+) to save disk space
• file_sys_status.sh - Monitors filesystem space and sends email alerts when space is low
• ram_monitoring.sh - Checks available RAM and provides alerts when memory is running low
• user_make.sh - Creates new system users with auto-generated passwords and proper permissions

🛠️ Usage

Each script is standalone and can be executed directly after making it executable:

# Make a script executable
chmod +x script_name.sh

# Execute a script
./script_name.sh

📚 Learning Path

This repository is organized in a progressive learning path:

1. Start with basics (01-09)
2. Move to control structures (10-14)
3. Learn loops (15-23)
4. Understand functions and arguments (24-27)
5. Explore system operations (28-35)
6. Master advanced techniques (36-39)
7. Apply knowledge with real-world projects

🔍 Requirements

• Bash shell (version 4.0 or higher recommended)
• Linux/Unix environment or Windows with WSL
• Root/sudo access (for some system administration scripts)

🤝 Contributing

Contributions are welcome! Please feel free to submit a Pull Request.

1. Fork the repository
2. Create your feature branch (git checkout -b feature/amazing-feature)
3. Commit your changes (git commit -m 'Add some amazing feature')
4. Push to the branch (git push origin feature/amazing-feature)
5. Open a Pull Request

📝 License

This project is licensed under the MIT License - see the LICENSE file for details.

👤 Author

Rohan

• GitHub: Ruhon Deb

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This repository is maintained and updated regularly. Last update: May 2025