cron

minute / hour / dOM / month / dOW

global:

  • * — any value

  • , — set of values

  • - — value range

  • minute

    • 159
  • hour

    • 023
  • dOM

    • 131
  • month

    • 112
    • JANDEC
  • dOW

    • 06
    • SUNSAT
# 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