The cron daemon
It starts at boot and remains up.
Almost anything you can do in a shell window can be done in cron.
SGI: /etc/cron.d directory for defaults (deny, allow) and /usr/var/spool/cron directory for crontabs.
Crontabs are the scheduling files. See an example here. Are created by user, e.g. root, abento, etc.
- format: min hour daymo month daywk cmd