Cron

In order to setup a chronological repeating task without a for loop that checks every second, you will use cron library installed on most linux distros.

Setups

1. crontab -e
2. https://crontab.guru find the time that you want to repeat.
3. Write your task: * */5 * * * /sbin/shutdown -r now (will reboot every 5hrs)
4. After saving, cron will update right away, no extra steps required.
5. crontab -l to view saved tasks