Bash (Bourne Again Shell) is a command-line interpreter that allows users to interact with a Unix-based operating system (Linux, macOS, and WSL on Windows). It is a powerful tool for automation, scripting, and system administration. Below is a detailed breakdown of Bash commands, categorized for ease of learning.

1️⃣ Basics of Bash Commands

Syntax

• Commands are usually structured as:

  command [options] [arguments]
  

• Example:

  ls -l /home/user
  

Command Execution

• Execute a command:

  echo "Hello, World!"
  
  

• Execute multiple commands:

  command1; command2  # Runs sequentially
  command1 && command2  # Runs command2 only if command1 is successful
  command1 || command2  # Runs command2 only if command1 fails
  
  

Command Help

• man command → Open manual page
• command --help → Show basic usage

2️⃣ File and Directory Commands 📂

Navigation

• pwd → Show current directory
• ls → List files & directories
  • ls -l (detailed list)
  • ls -a (show hidden files)
• cd directory → Change directory
  • cd ~ (Home directory)
  • cd .. (Move up one level)

File Operations