There is a little known command in linux that is very handy when scheduling a task. Normally server administrators prefer using CRON for handling all scheduling. However, CRON is primarily designed for setting up recurring schedules and isn't really the right tool for one time jobs. If you have a server task that needs to be run at a particular time just once, then I suggest using `at`.

Exampleat -f /usr/local/bin/reboot.pl