Crontab has an @reboot key which is convenient for quick hacks without making a whole systemd unit. Speaking of systemd, "man systemd-rc-local-generator" alleg

Crontab has an @reboot key which is convenient for quick hacks without making a whole systemd unit. Speaking of systemd, "man systemd-rc-local-generator" alleges you can still create an rc.local and it will handle it.