Linux CLI 53 🐧 shell scripts introduction

a -  what is a shell script
shell script is a sequence of commands written in plain text file that is executed by Unix or Linux shell
This script automates the execution of tasks and can be used for a variety of purposes
Purpose → helps automate repetitive tasks, making them faster and less error-prone
Interpreted language →is interpreted by the shell (like bash), not compiled.
Command-based → consists of a series of commands that can be run manually in the terminal.
Extensibility → can include control structures like loops, conditionals, and functions.
Portability → can often be made portable across different Unix-like systems.
common uses: automation, deployment, system administration

b - How to write a shell script
Step 1 → open a text editor (nano, vim, gedit, vi, kate etc)
Step 2 → add the Shebang Line. It tells the system which interpreter to use
Step 3 → write your script
Step 4 → save and exit
Step 5 →make the script executable
Step 6 → run the script
In a shell script you can have variables, conditional statements, functions...
You can also take input from the user.

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