Bash Shell
What is Bash shell ?
Bash (Bourne Again SHell) is the most commonly used Linux shell.
It is a command-line interpreter that allows you to run commands and write scripts.
Bash is the default and most widely used Linux shell, used to run commands and write scripts for automation.
Simple Meaning:
Bash = A program where you type commands in Linux.
It is an improved version of the older Bourne Shell (sh).
Why it is called Bourne Again SHell ?
Because it is a new, improved version of the Bourne shell (sh) → “born again”.
What Bash shell Does ?
Reads and executes commands
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Examples:
ls, cd, mkdir, rm, cat
Runs shell scripts
Automation using .sh files.
Provides features like:
- Command history
- Auto-completion
- Aliases
- Loops, variables, functions
- Error handling
- Wildcards (
*,?)
Why Bash Is Used in Linux Systems
Bash is used in Linux because it is:
- Default shell on most Linux distributions
- Powerful and flexible for system management
- Scriptable, allowing automation of repetitive tasks
- Lightweight, works without a graphical interface
- Compatible with older
sh(Bourne shell) scripts
It is essential for server administration, DevOps, cloud computing, and automation.
Where is Bash is Used ?
Linux servers
- DevOps environments
- Cloud (AWS, Azure, GCP)
- CI/CD pipelines
- Automation scripts
- Local Linux terminal
Almost every Linux machine has bash installed.
