How to Run Shell Script as SystemD Service in Linux

Systemd is a software application that provides an array of system components for Linux operating systems. It is the first service to initialize the boot sequence. This always runs with pid 1. This also helps use to manage system and application service on our Linux operating system.

We can also run any custom script as systemd service. It helps the script to start on system boot. This can be helpful for you to run any script which required to run at boot time only or to run always.

In our previous tutorial we have provides you instructions to run a Python script using Systemd. This tutorial coverts to run a shell script as Systemd service.

Step 1 – Create a Shell Script

First of all, create a sample shell script to run always until the system is running.

sudo vi /usr/bin/script.sh 

Add the following sample script.

#!/bin/bash

while true
do
 // Your statements here
 sleep 10
done

Save script and set execute permission.

sudo chmod +x /usr/bin/script.sh 

To run a script once during system boot time doesn’t required any infinite loop. Instead of the above script, you can use your shell script to run as Systemd service.

Step 2 – Create A SystemD File

Next, create a service file for the systemd on your system. This file must have .service extension and saved under the under /lib/systemd/system/ directory

sudo vi /lib/systemd/system/shellscript.service 

Now, add the following content and update the script filename and location. You can also change the description of the service.

[Unit]
Description=My Shell Script

[Service]
ExecStart=/usr/bin/script.sh

[Install]
WantedBy=multi-user.target

Step 3 – Enable New Service

Your system service has been added to your service. Let’s reload the systemctl daemon to read new file. You need to reload this deamon each time after making any changes in in .service file.

sudo systemctl daemon-reload 

Now enable the service to start on system boot, also start the service using the following commands.

sudo systemctl enable shellscript.service 
sudo systemctl start shellscript.service 

Finally verify the script is up and running as a systemd service.

sudo systemctl status shellscript.service 

Output looks like below:

Conclusion

This tutorial helped you to configure a shell script as systemd service.

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