Online Crontab expression generation tool makes it easy to create scheduled task scheduling rules. There is no need to write complex code manually and quickly generate standard Crontab expressions to help you efficiently manage task automation. Works on Linux, Unix and other systems that support Crontab.
使用说明
Guide to using Crontab
crontab is a tool for scheduling tasks in Unix and Unix-like systems. By writing cron expressions, you can perform tasks on a regular basis.
basic syntax
* * * * * command_to_execute
- - - - -
| | | | |
| | | | └ -- What day of the week (0-7) (Sunday = 0 or 7)
| | | └ -- Month (1-12)
| | └ -- -- Date (1-31)
| └ -- -- hour (0-23)
└ -- -- Minutes (0-59)
1 time field description:
*: matches any value.Numer: specify a specific time.,: indicates multiple time values. For example, 1, 3, 5 means the 1st, 3rd, 5th minute.-: indicates the range, for example, 1-5 means from the 1st minute to the 5th minute./: indicates the step size. For example, * / 2 means that it is executed every 2 minutes.
example
# perform a task every 5 minutes
* / 5 * / path/to/command
# perform the task at 8: 00 a.m. every Monday
0 8 * * 1 / path/to/command
# perform tasks at 2: 00 p.m. on the 1st and 15th of each month
0 14 1,15 * * /path/to/command
# perform tasks every hour from 9: 00 a.m. to 5: 00 p.m. Every working day
0 9-17 * 1-5 / path/to/command
2. Special time string
| Special string | equivalent expression | description |
|---|---|---|
@reboot |
NumberA | execute when the system starts |
@yearly |
0 0 1 1 * |
execute once a year (January 1) |
@monthly |
0 0 1 * * |
execute once a month |
@roomly |
0 0 * * 0 |
execute once a week |
@daily |
0 0 * * * |
execute once a day |
@hourly |
0 * * * * |
execute every hour |