What 0 * * * * means
Runs once at the top of every hour — the default choice for hourly reports, log rotation and hourly backups.
In plain English, cron reads this as: every hour, every day.
Field-by-field breakdown
| Field | Value | Meaning |
|---|---|---|
| Minute | 0 | at 0 |
| Hour | * | every value |
| Day of month | * | every value |
| Month | * | every value |
| Day of week | * | every value |
Editing this schedule
To adjust this expression or explain a different one, open the full cron expression parser — it explains any crontab line, lists upcoming runs and breaks down each field as you type. New to the syntax? The practical guide to cron expressions walks through every field with worked examples.