Bash (Bourne Again SHell)

Bash is a command-line interpreter and scripting language widely used on Unix-based systems, including Linux and macOS. It is the default shell for many Linux distributions and provides powerful tools for automating tasks, managing files, and interacting with the operating system.

Key Features

• Command History: Stores previously executed commands for recall using history.
• Tab Completion: Auto-completes commands, file names, and directory paths.
• Environment Variables: Stores system-wide or session-specific settings (e.g., PATH, HOME).
• Pipelines and Redirection: Combines commands and directs input/output using |, >, and <.
• Scripting: Supports writing scripts to automate repetitive tasks using loops (for, while), conditionals (if, case), and functions.

Common Commands

• ls - List directory contents.
• cd - Change the current directory.
• pwd - Print the current working directory.
• echo - Display text or variables.
• grep - Search for patterns in text.
• find - Search for files and directories.
• chmod - Change file permissions.
• man - Display manual pages for commands.

Example Script

#!/bin/bash
# A simple script to print "Hello, World!"
echo "Hello, World!"