Various services from cron exist, e.g.
sudo apt -y install cronie
start the cronie with
sudo Systemctl start cronie
start a cron with
You can run a script with:
*/10 * * * * /home/pi/script.sh
… which would run every 10 minutes.
To run something as root, do:
sudo crontab -e
For example, you can update the database, meaning searches with ’locate’ command will be faster.
*/30 * * * * /usr/bin/updatedb