I am just starting to learn cron jobs. Basically I am going to use webmin to manage my cron jobs, I am also reading some basic information about cron jobs.
So far I've learned that
/etc/crontab stores the cronjobs and
/var/spool/cron/crontabs has cron jobs for different users, and that when I do
crontab -e I can see and edit the cron jobs for current user.
Root is the only user in my Ubuntu 14.04, and there are only several lines in the crontab files I found in above locations. However, in webmin, this is what I see
It is a lot more than what I see in those files. So my question is: where do all these cronjobs I see in webmin come from?