Creating a script file (.sh) in Bash Scripting

Introduction

A script file (.sh) lets you save commands to run them easily anytime without typing again.

You want to automate daily tasks like backups.

You need to run a set of commands repeatedly.

You want to share a set of commands with a friend or colleague.

You want to organize commands for a project in one place.

You want to run commands on a remote server automatically.

Syntax

Bash Scripting

#!/bin/bash

# Your commands go here

The first line #!/bin/bash tells the system to use the bash shell to run the script.

Make sure to give your script file execute permission with chmod +x filename.sh.

Examples

A simple script that prints Hello, world! to the screen.

Bash Scripting

#!/bin/bash

echo "Hello, world!"

A script that lists files in the /home/user directory.

Bash Scripting

#!/bin/bash

ls -l /home/user

A script that shows the current date and time.

Bash Scripting

#!/bin/bash

# This script shows the current date and time
date

Sample Program

This script prints a welcome message when run.

Bash Scripting

#!/bin/bash

# This script greets the user

echo "Welcome to your script!"

Important Notes

Always start your script with #!/bin/bash to ensure it runs with bash.

Use chmod +x yourscript.sh to make the script executable.

Run your script by typing ./yourscript.sh in the terminal.

Summary

A .sh file saves commands so you can run them anytime.

Start with #!/bin/bash to tell the system how to run it.

Make the file executable with chmod +x before running.