cron

minute / hour / dOM / month / dOW

global:

  • * — any value

  • , — set of values

  • - — value range

  • minute

    • 1–59

  • hour

    • 0–23

  • dOM

    • 1–31

  • month

    • 1–12
    • JAN–DEC

  • dOW

    • 0–6
    • SUN–SAT
# For scripts that don't need root privileges
crontab -e

# For scripts that need to be run as root
sudo crontab -e 

0 0 * * * command
0 0 1 * * certbot renew

Links

  • https://crontab.guru