Simple Cronjob Example

Cron is a utility program for scheduling tasks, or cron jobs, in ubuntu and other linux based systems.

Cron is a daemon --  a background process. They are similar to Windows services. 

The command crontab -e while logged in as root will open a contab for editting where you can place a cronjob.

This exmaple will delete the contents of a folder every 60 minutes:
*/60 * * * *  find  /usr/place/folder/* -delete

You can find a time cheatsheet here: https://onecompiler.com/cheatsheets/cron