如何做一个cron工作每72分钟 [英] How to do a cron job every 72 minutes

问题描述

我如何获得cron作业，每72分钟运行一次？

How would I get a cron job to run every 72 minutes? Or some not so pretty number like that?

推荐答案

由于 cron 运行工作基于时间，而不是基于时间间隔，没有明显简单的方法。然而，虽然它有点黑客，你可以在 crontab 中设置多行，直到找到公分母。由于您希望每72分钟运行一次作业，因此必须在以下时间执行：

Since cron runs jobs time-based, not interval-based, there's no blindingly simple way to do it. However, although it's a bit of a hack, you can set up multiple lines in crontab until you find the common denominator. Since you want a job to run every 72 minutes, it must execute at the following times:

• 00:00


• 01:12


• 02:24


• 03:36


• 04:48


• 06:00


• 07:12


• ...

• 00:00
• 01:12
• 02:24
• 03:36
• 04:48
• 06:00
• 07:12
• ...

如您所见，该模式每6小时重复5个作业。因此，您的 crontab 中将有5行：

As you can see, the pattern repeats every 6 hours with 5 jobs. So, you will have 5 lines in your crontab:

0  0,6,12,18  * * * command
12 1,7,13,19  * * * command
24 2,8,14,20  * * * command
36 3,9,15,21  * * * command
48 4,10,16,22 * * * command

，是创建一个包装器守护程序或shell脚本，执行并睡眠所需的时间，直到停止。

The other option, of course, is to create a wrapper daemon or shell script that executes and sleeps for the desired time until stopped.

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