All cron examples

Cron expression: every 30 seconds (workaround)

Standard cron cannot run more often than once a minute — this page shows the common workaround.

* * * * *

Field by field

FieldValueMeaning
Minute*Every minute
Hour*Every hour
Day of month*Every day of the month
Month*Every month
Day of week*Every day of the week

Typical uses

  • High-frequency polling where a proper scheduler/daemon isn't available

Good to know

  • Workaround: schedule the job every minute twice — once as-is and once wrapped in a 30-second delay: * * * * * /path/job and * * * * * sleep 30; /path/job.
  • If you need sub-minute scheduling regularly, prefer a real scheduler (systemd timers with OnUnitActiveSec, a worker loop, or your platform's queue).

Related schedules

Every 10 minutes*/10 * * * *Every 15 minutes*/15 * * * *Every 30 minutes*/30 * * * *Every hour0 * * * *Every 2 hours0 */2 * * *Every 3 hours0 */3 * * *

Need a different schedule? Build and validate any cron expression visually with the free Cron Expression Builder.