List (-l), edit (-e) and remove (-r) crontab entries
crontab -l
crontab -e
crontab -r
Edit crontab for a different user
sudo -u <user> crontab -e
Example crontab entry (run php script every 30 minutes)
30 * * * * cd /path/to/script; php -q script.php > /dev/null
Timing format
- min (0-59) / hour (0-23) / day of month (1-31) / month (1-12) / day of week (0-6, 0=Sunday)
- Use asterisk in a specific slot to represent every instance (eg. every hour, day etc)
Crontab Command Tips
- Separate multiple statements for one cron instruction with
; - Suppress error/output by redirecting result to
> /dev/null