Quick Load Preset

Syntax Reference

• * : Any value (e.g. * in hour means every hour)
• , : Value list separator (e.g. 1,15 in day means 1st and 15th)
• - : Range of values (e.g. 1-5 in weekday means Mon to Fri)
• / : Step values (e.g. */5 in minute means every 5 minutes)

Command Reference

• crontab -e — Open the current user's crontab for editing
• crontab -l — List all scheduled jobs for the current user
• crontab -r — Remove all scheduled jobs (irreversible!)
• crontab -u <user> -e — Edit the crontab of a specific user (requires root)
• sudo systemctl status cron — Check if the cron daemon is running (Debian/Ubuntu)
• sudo systemctl status crond — Check if the cron daemon is running (RHEL/Fedora)
• grep CRON /var/log/syslog — Check cron execution logs (Debian/Ubuntu)
• journalctl -u cron -f — Follow cron logs in real time via systemd
• journalctl -t "my-tag" -f — Follow logs for a specific systemd-cat tag
• env -i /usr/bin/myscript.sh — Run a script with a clean environment (mimics cron)