In this tutorial you will learn:
- How to create Systemd service unit
- How to create a simple disk space check script
- How to set permissions to Systemd service unit file
- How to set script permissions
- How to enable Systemd service unit to run at the system startup
|Category||Requirements, Conventions or Software Version Used|
|System||Ubuntu 22.04 Jammy Jellyfish|
|Other||Privileged access to your Linux system as root or via the
# – requires given linux commands to be executed with root privileges either directly as a root user or by use of
$ – requires given linux commands to be executed as a regular non-privileged user
How to run script on startup on Ubuntu 22.04 step by step instructions
The Ubuntu 22.04 is based on Systemd hence the simplest and recommended way to run a script on startup is to create a Systemd service file and execute any script such as bash, python etc, via this service during the system boot.
The below steps will show you to run an example bash script which reports disk space usage of the
/home directory and saves the report in the
/root directory every time the Ubuntu 22.04 system boots.
- First, create a Systemd service file as in an example below. We will store this file as
[Unit] After=network.target [Service] ExecStart=/usr/local/bin/disk-space-check.sh [Install] WantedBy=default.target
After: Instructs systemd on when the script should be run. In our case the script will run after network connection. Other example could be mysql.target etc.
ExecStart: This field provides a full path to the actual script to be executed on startup
WantedBy: Into what boot target the systemd unit should be installed
For more information on how to create Systemd service unit execute the
- Create a script to be executed on Ubuntu system startup. As specified in the above Step 1, the path and the name of the new script in our example will be
The below is an example of such script:
#!/bin/bash date > /root/disk_space_report.txt du -sh /home/ >> /root/disk_space_report.txt
- Set appropriate permissions for both, the Systemd service unit and script:
$ sudo chmod 744 /usr/local/bin/disk-space-check.sh $ sudo chmod 664 /etc/systemd/system/disk-space-check.service
- Next, enable the service unit:
$ sudo systemctl daemon-reload $ sudo systemctl enable disk-space-check.service
- Now you are ready to reboot your system. Once the system boots you should see the following file containing disk space usage within your
$ sudo ls /root/ disk_space_report.txt
In this tutorial, we saw how to configure Ubuntu 22.04 to run a script upon each system startup. This is a handy feature for system administrators to implement in order to make sure a Bash or Python script is executed every time Ubuntu loads in from a system reboot.