Shell Scripting Automation Suite

Production-ready shell scripts for Linux system administration and automation

📂 View Scripts • 🚀 Quick Start • 💡 Usage Examples

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🎯 Overview

A comprehensive collection of Bash scripts demonstrating real-world system administration automation, user management, and DevOps best practices. Built with security, error handling, and production environments in mind.

✨ Skills Demonstrated

System Administration ✅ User & permissions management ✅ Automated backup solutions ✅ Package management automation ✅ System validation & health checks

Shell Scripting Proficiency ✅ Functions & modular design ✅ Input validation & error handling ✅ Loops & control structures ✅ Variables & command substitution ✅ Silent/secure input handling

📂 Script Inventory

👥 User Management

Script	Description	Usage
create_user.sh	Interactive user creation with secure password input	./create_user.sh
create_User_usingParameter.sh	Create user via command-line parameters	./create_User_usingParameter.sh <username>
delete_user.sh	Safe user deletion with verification	./delete_user.sh
check_if_user_exists.sh	Validate user existence on system	./check_if_user_exists.sh

🛠️ System Administration

Script	Description	Usage
backups.sh	Automated timestamped ZIP backups	./backups.sh <source> <destination>
create_shell_backup.sh	Enhanced backup with detailed logging	./create_shell_backup.sh <source> <destination>
install_package.sh	Automated package installation	./install_package.sh <package-name>

📚 Shell Scripting Fundamentals

Script	Description	Concepts
Variables.sh	Variable declaration and usage patterns	Variables, command substitution
Variables_2.sh	Advanced variable operations	Variable manipulation
loops_shell.sh	Looping constructs (for, while)	Iteration, counters
function_greet.sh	Basic function definition	Functions
function_with_parameters.sh	Functions with arguments	Parameter passing
function_with_returnType.sh	Functions with return values	Return codes, output capture
function_test.sh	Comprehensive function examples	Modular programming
read_input.sh	User input handling	stdin, read command
read_silent_flag.sh	Secure password input with -s flag	Silent input, readonly vars
args_input.sh	Command-line argument processing	$1, $2, $@, $#
greet_user.sh	Interactive greeting script	Basic I/O

🚀 Quick Start

# Clone the repository
git clone https://github.com/H1manshu-Kumar/shell-scripts.git

# Navigate to directory
cd shell-scripts

# Make scripts executable
chmod +x *.sh

# Run any script
./create_user.sh

💡 Usage Examples

Create Automated Backups

# Backup your project directory
./backups.sh /home/user/project /home/user/backups

# Output: backup-2024-01-15-14-30.zip created

User Management Workflow

# Check if user exists
./check_if_user_exists.sh

# Create new user with secure password prompt
./create_user.sh

# Remove user when needed
./delete_user.sh

Install Multiple Packages

# Install packages in automated workflow
./install_package.sh docker
./install_package.sh nginx

🔒 Security Features

• 🔐 Silent password input (-s flag) prevents credential exposure
• ✅ User existence validation before operations
• 🛡️ sudo privilege separation for system-level changes
• 📝 Input sanitization and error checking

📋 Requirements

• Linux-based OS (Ubuntu, Debian, CentOS, RHEL)
• Bash 4.0+
• sudo privileges (for user management and package installation)

🎓 Learning Path

This repository progressively covers:

1. Basics: Variables, input/output, arguments
2. Intermediate: Functions, loops, conditionals
3. Advanced: User management, system automation, backup solutions

🤝 Contributing

Contributions are welcome! Help improve these automation scripts.

# Fork the repo and create a feature branch
git checkout -b feature/enhanced-backup

# Commit your changes
git commit -m "Add incremental backup support"

# Push and create a Pull Request
git push origin feature/enhanced-backup

📝 Best Practices Implemented

✅ Shebang line (#!/bin/bash) for interpreter specification
✅ Comments and documentation blocks
✅ Error handling and validation
✅ Modular function-based design
✅ Secure credential handling
✅ Output redirection for clean execution

👨‍💻 Author

Himanshu Kumar - Building, Containerizing, and Deploying One Step at a Time 🚀

🔗 GitHub: https://github.com/H1manshu-Kumar
🔗 LinkedIn: https://www.linkedin.com/in/h1manshu-kumar

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💻 Happy Scripting! 🚀