About the Cron Expression
Cron is use in Linux for the time schedule
Format
Seconds Minutes Hours DayofMonth DayofWeek [Year]
The value of each row
| Second | Minute | Hours | DayofMonth | DayofWeek | Year |
|---|---|---|---|---|---|
| , - * / 0-59 | , - * / 0-59 | , - * / 0-23 | , - * / 1-12 JAN-DEc | , - * / ? L C # 1-7 SUN-SAT | , - * / 1970-2099 |
Special character:
1. * every
2. ? If the DayofMonth use *, the DayofWeek must use ? to match any
3. - Rang 5-7 means5, 6, 7 match
4. / interval for each, 0/30 means start when 0 and each 30 will match.
5. , It use for list
6. L Means Last
7. W Work day
Sample
0 5,15, * * * ? every week every month each hours 5 and 15 minute match.
0 0 10,14,16 * * ? Every day 10am, 2pm, 4 pm match.
0 15 10 L * ? The last day of each month at 10:15 am