system timers
A systemd timer is the modern replacement for a cron job. Instead of a line in /etc/crontab, a scheduled task on a systemd box is two files that work as a pair:
- A
.timerunit — the schedule. It says "when." It does nothing on its own except wait for its time and then activate its partner. - A
.serviceunit — the work. It says "what to run and as whom." The timer starts this service each time it fires.