Cron — the task scheduler

Cheat sheet

• crontab -e edit your own crontab
• crontab -l show the current crontab
• */15 * * * * /usr/local/bin/backup.sh every 15 minutes
• systemctl list-timers list systemd timers
• journalctl -u backup.service log for a specific job
• grep CRON /var/log/syslog what cron ran