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Bash Shell

What is Bash?​

Bash stands for:

Bourne Again Shell

It is the default shell for most Linux distributions.​

Architecture

User
 ↓
Terminal
 ↓
Bash
 ↓
Kernel
 ↓
Hardware

Responsibilities of Bash

  • Execute commands
  • Manage variables
  • Handle scripts
  • Perform expansions
  • Manage jobs

Check Current Shell

echo $SHELL

Example:

/bin/bash

Start New Bash Session

bash

Exit:

exit

Features

✅ Variables ✅ Pipes ✅ Redirections ✅ Job Control ✅ Tab Completion ✅ Scripting​

Bash Configuration Files

System-wide​

/etc/profile

User Configuration​

~/.bashrc

Login Shell​

~/.profile

Reload Configuration

source ~/.bashrc

Bash Prompt

Example:

aayan@ubuntu:~$

Meaning:

PartDescription
aayanUsername
ubuntuHostname
~Current directory
$Normal user

Root user:

root@ubuntu:~#

Useful Bash Commands

History:

history

Aliases:

alias

Shell variables:

set

Environment variables:

env

Why Bash Matters

Bash is essential for:

  • Linux Administration
  • Ethical Hacking
  • DevOps
  • Server Automation
  • PocketMine Hosting

Summary

Bash is the heart of Linux command-line operations.