What a shell script is in Bash Scripting

Introduction

A shell script is a simple way to tell your computer to do many tasks automatically, saving you time and effort.

You want to open several programs at once without clicking each one.

You need to organize many files quickly, like renaming or moving them.

You want to repeat a task every day without doing it manually.

You need to check system information regularly, like disk space or memory.

You want to combine small commands into one easy-to-run file.

Syntax

Bash Scripting

#!/bin/bash

# Your commands go here
command1
command2
...

The first line #!/bin/bash tells the computer this is a bash script.

Each command is written on its own line, just like typing in the terminal.

Examples

This script prints the message Hello, world! on the screen.

Bash Scripting

#!/bin/bash
echo "Hello, world!"

This script lists files in detail and then shows the current folder path.

Bash Scripting

#!/bin/bash
ls -l
pwd

Sample Program

This script shows a welcome message and the current date and time.

Bash Scripting

#!/bin/bash
# Simple script to greet the user

echo "Welcome to your computer!"
echo "Today is: $(date)"

Important Notes

Make sure to give your script permission to run by typing chmod +x scriptname.sh in the terminal.

You can run your script by typing ./scriptname.sh in the terminal if you are in the same folder.

Use comments starting with # to explain what each part of your script does.

Summary

A shell script is a file with commands that the computer runs automatically.

It helps you do repetitive tasks faster and without mistakes.

You write commands just like you would type them in the terminal.