How do I run a Linux script from startup?

This is the way I do it on Red Hat Linux systems. Put your script in /etc/init. d , owned by root and executable.
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Test Test Test:

1. Run your test script without cron to make sure it actually works.
2. Make sure you saved your command in cron, use sudo crontab -e.
3. Reboot the server to confirm it all works sudo @reboot.

How do I run a script as root on startup?

This worked for me on Ubuntu 17.04:

1. create a script file like disable_cdrom in convenient for you location. In my case home/yterle/disable_cdrom . …
2. make it executable chmod 775 disable_cdrom.
3. navigate to /etc/systemd/system and create there a service file. For example sudo gedit /etc/systemd/system/disable_cdrom.service.