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DevOps & Automation · Foundational

Cron

A time-based job scheduler and its five-field schedule syntax (minute, hour, day of month, month, day of week).

Definition

Cron syntax is used by Linux crontab, Kubernetes CronJobs, GitHub Actions schedule triggers, and cloud schedulers. GitHub Actions schedules run in UTC on the default branch.

Example

0 3 * * 1-5 runs at 03:00 every weekday.

Exam tip

Read cron fields left to right: minute, hour, day-of-month, month, day-of-week.

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