#Aide Crontab # ┌────────── minute (0 - 59) │ ┌──────── hour (0 - 23) │ │ ┌────── day of month (1 - 31) │ │ │ ┌──── month (1 - 12) │ │ │ │ ┌── day of week (0 - 6 => Sunday - Saturday, or 1 - 7 => Monday - Sunday) │ │ │ │ │ ↓ ↓ ↓ ↓ ↓ * * * * * command to be executed 58 23 * * * /sbin/iptables-save > /etc/firewall.iptables-cron 2>&1 string meaning ------ ------- @reboot Run once, at startup. @yearly Run once a year, "0 0 1 1 *". @annually (same as @yearly) @monthly Run once a month, "0 0 1 * *". @weekly Run once a week, "0 0 * * 0". @daily Run once a day, "0 0 * * *". @midnight (same as @daily) @hourly Run once an hour, "0 * * * *". ##### Hope it will help ;)