How to execute a shell script in Linux

I am a new Linux system user. How do I execute a shell script in Linux? How do I write and execute a shell script on Linux system?

This page shows various steps to write and execute a shell script in Linux using the Terminal window or app.

Steps to execute a shell script in Linux

The procedure is as follows:

  1. Create a new file called demo.sh using a text editor such as nano or vi in Linux: nano demo.sh
  2. Add the following code:
    #!/bin/bash
    echo "Hello World"
  3. Set the script executable permission by running chmod command in Linux: chmod +x demo.sh
  4. Execute a shell script in Linux: ./demo.sh

Let us see all steps in details.

Step 1 – Open the terminal

To write a shell script, open the terminal app. Hit the keyboard shortcut Ctrl-Alt+T:

Step 2 – Write the shell script using an editor

Type the following command to write a shell script:
nano demo.sh
OR
vi demo.sh

Creating your first shell script named demo.sh

Add the following code:
#!/bin/bash
# My first shell script
echo "Hello $USER"
echo "Today is $(date)"
echo "Bye for now"

To Save and close the file in nano press CTRL+X and when prompted choose Y (Yes) to save the file and followed by the Enter key:

Writing your first shell script

Step 3 – Make the shell script executable

Let us verify newly created file, run [nicmd name=”ls”] and cat command:
ls -l demo.sh
cat demo.sh

To set executable permission, run the following chmod command:
chmod +x demo.sh
Verify permissions:
ls -l demo.sh

Give execute permission to your script on Linux

Step 4 – Execute the shell script in Linux

Now we have shell script named demo.sh. But, how do you run it? Try:
./demo.sh
The . refers to the current directory. Another option is to specify the full path:
/path/to/demo.sh
/home/vivek/demo.sh
~/demo.sh

Executing a shell script in Linux

Conclusion

For more info see Linux Shell Scripting Tutorial and bash command man page:
man bash
help read


🐧 Get the latest tutorials on Linux, Open Source & DevOps via RSS feed or Weekly email newsletter.

🐧 1 comment so far... add one


CategoryList of Unix and Linux commands
Disk space analyzersdf duf ncdu pydf
File Managementcat cp mkdir tree
FirewallAlpine Awall CentOS 8 OpenSUSE RHEL 8 Ubuntu 16.04 Ubuntu 18.04 Ubuntu 20.04
Modern utilitiesbat exa
Network UtilitiesNetHogs dig host ip nmap
OpenVPNCentOS 7 CentOS 8 Debian 10 Debian 8/9 Ubuntu 18.04 Ubuntu 20.04
Package Managerapk apt
Processes Managementbg chroot cron disown fg glances gtop jobs killall kill pidof pstree pwdx time vtop
Searchingag grep whereis which
User Informationgroups id lastcomm last lid/libuser-lid logname members users whoami who w
WireGuard VPNAlpine CentOS 8 Debian 10 Firewall Ubuntu 20.04
1 comment… add one
  • Tristan May 11, 2017 @ 8:05

    How do you execute .sh in Linux?
    Give execute permission to the script:
    chmod +x /path/to/script.sh
    To run your script:
    /path/to/script.sh
    ./script.sh

Leave a Reply

Your email address will not be published.

Use HTML <pre>...</pre> for code samples. Still have questions? Post it on our forum