Linux Administration Cookbook

cron

I'm not aware of an easy way to list information from cron; if you know of one, please write to me and blow my mind.

cron, as we said previously, is a daemon for executing commands on a schedule. It's still in wide use and there's many systems out there with a hybrid systemd timers/cron setup.

By default, cron features the following directories in /etc/:

cron.d/       cron.daily/   cron.hourly/  cron.monthly/ cron.weekly/

Within cron.d, we can see a single file named 0hourly, the contents of which are copied in the following:

cat 0hourly # Run the hourly jobsSHELL=/bin/bashPATH=/sbin:/bin:/usr/sbin:/usr/binMAILTO=root01 * * * * root run-parts /etc/cron.hourly

And within the /etc/cron.hourly directory, we have only 0anacron:

#!/bin/sh# Check whether ...