I'm trying to set up a cron, and wanted to see first how this works whole. I followed this tutorial: https://www.digitalocean.com/community/articles/how-to-use-cron-to-automate-tasks-on-a-vps There is also in it, that you should tell the cron he should run in the background: You'll need to make sure it runs in the background too: sudo / sbin / chkconfig crond on sudo / sbin / service crond start But as soon as I type one of these commands, I get the message "/ sbin / service: command not found ...