Xác thực và tạo crontab và lấy mô tả đọc được của lịch trình cron.
┌──────────── [optional] seconds (0 - 59) | ┌────────── minute (0 - 59) | | ┌──────── hour (0 - 23) | | | ┌────── day of month (1 - 31) | | | | ┌──── month (1 - 12) OR jan,feb,mar,apr ... | | | | | ┌── day of week (0 - 6, sunday=0) OR sun,mon ... | | | | | | * * * * * * command
| Symbol | Meaning | Example | Equivalent |
|---|---|---|---|
| * | Any value | * * * * | Every minute |
| - | Range of values | 1-10 * * * | Minutes 1 through 10 |
| , | List of values | 1,10 * * * | At minutes 1 and 10 |
| / | Step values | */10 * * * | Every 10 minutes |
| @yearly | Once every year at midnight of 1 January | @yearly | 0 0 1 1 * |
| @annually | Same as @yearly | @annually | 0 0 1 1 * |
| @monthly | Once a month at midnight on the first day | @monthly | 0 0 1 * * |
| @weekly | Once a week at midnight on Sunday morning | @weekly | 0 0 * * 0 |
| @daily | Once a day at midnight | @daily | 0 0 * * * |
| @midnight | Same as @daily | @midnight | 0 0 * * * |
| @hourly | Once an hour at the beginning of the hour | @hourly | 0 * * * * |