Running scripts in Bash Scripting

Introduction

Running scripts lets you tell your computer to do many tasks automatically, saving time and effort.

You want to automate daily tasks like backups or cleaning files.

You need to run a set of commands repeatedly without typing them each time.

You want to share a set of instructions with others to run on their computers.

You want to test a series of commands quickly.

You want to schedule tasks to run at specific times.

Syntax

Bash Scripting

# To run a script named script.sh
./script.sh

# Or run it with bash explicitly
bash script.sh

Make sure the script file has execute permission using 'chmod +x script.sh'.

You can run scripts by giving the path, like './script.sh' or '/path/to/script.sh'.

Examples

Give execute permission and then run the script from the current folder.

Bash Scripting

chmod +x myscript.sh
./myscript.sh

Run the script using the bash command without changing permissions.

Bash Scripting

bash myscript.sh

Run a script by giving its full path.

Bash Scripting

/home/user/scripts/myscript.sh

Sample Program

This script prints a friendly greeting message when run.

Bash Scripting

#!/bin/bash
# This script prints a greeting

echo "Hello, friend! Running scripts is easy!"

Important Notes

If you get 'Permission denied', use 'chmod +x script.sh' to allow running it.

Scripts must start with a 'shebang' line like '#!/bin/bash' to tell the system how to run them.

You can run scripts from any folder by giving the correct path.

Summary

Running scripts automates tasks by executing saved commands.

Use './script.sh' after making it executable or 'bash script.sh' to run scripts.

Always check permissions and use the shebang line for smooth running.