Online verification and parsing of Crontab expressions
Linux crontab is a command used to execute programs regularly. The time format is as follows:
┌──────────── [Optional, this field is not supported by the standard implementation] second (0 - 59)
| ┌────────── minute (0 - 59)
| | ┌──────── hour (0 - 23)
| | | ┌────── Day of the month (1 - 31)
| | | | ┌──── month (1 - 12)
| | | | | ┌── Day of the week (0 - 6) (Sunday is 0)
| | | | | |
* * * * * * commandDescription analysis:
| symbol | meaning | example | Description |
|---|---|---|---|
| * | Indicates any value matching this field | * * * * * | Execute once every minute |
| - | Indicates range | 1-10 * * * * | Trigger every minute from 1 minute to 10 minutes |
| , | List enumeration values | 1,10 * * * * | Trigger every minute at 1 and 10 minutes |
| / | Trigger starts at the starting time, and then triggers every fixed time | */10 * * * * | Trigger every 10 minutes |