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Created May 31, 2020 14:28
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A guide to crontab
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README.md

Adding jobs

  • crontab -e: then add a line representing the job

Syntax

  • @reboot sleep 60 && my_script.sh
  • 59 12 * * * simon /usr/bin/sample.sh > /dev/null 2>&1

Known issues

  • silent failures: running a job with no permission for the current user fails silently, be careful to provide sudo when needed

Debug

  • Either sudo systemctl status crond or sudo systemctl status cron.service: Show recent systemd logs
  • Either journalctl --unit crond -n all or journalctl --unit cron -n all: Show all systemd logs Other ways
  • journalctl _COMM=cron
  • cat /var/log/syslog | grep crontab On some systems the logs are stored in /var/log/cron
  • cat /var/log/cron
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