Linux Shell/Bash Scripting

Shell/Bash Scripting is a practical, beginner-friendly guide designed to help you learn Bash scripting from the ground up while building the skills required for real-world Linux administration and technical interviews.

Rather than focusing only on syntax, this guide explains how Bash scripting is used in production environments to automate repetitive tasks, manage systems efficiently, and simplify day-to-day operations.

Inside this ebook, you'll learn:

• Introduction to Shell and Bash
• Difference between Shell and Bash
• Shebang (#!/bin/bash) and script execution
• Variables, constants, and command substitution
• Arrays and associative arrays
• String operations and manipulation
• Arithmetic, comparison, string, and logical operators
• Conditional statements (if, elif, else)
• case statements
• for, while, until, and infinite loops
• Functions, local variables, and positional parameters
• Passing arguments to scripts
• Useful Bash variables and environment variables
• File and directory tests
• Input, output, and error redirection
• Standard Input, Output, and Error (STDIN, STDOUT, STDERR)
• Logging using echo and the logger command
• Script debugging with bash -x, set -x, and set -e
• Running scripts in the background using nohup
• Task automation using At and Cron