在00h和13:30每天执行crontab两次 [英] execute crontab twice daily at 00h and 13:30

问题描述

我想在每天的00:00和13:30执行一个脚本，所以我写：

i want to execute a script twice daily at 00:00 and 13:30 so i write :

0,30 0,13 * * *

这似乎对我来说是错误的，因为这样， 00:00，00:30，13:00和13:30。任何想法？

it seems wrong for me, because like this, the script will fire at 00:00 , 00:30 , 13:00 and 13:30. Any idea ?

推荐答案

为什么不放两个cron条目？一个是00:00，一个是13:30？我不认为你可以在一个条目中做你想要的，因为两分钟定义将适用于两个小时定义（如你所确定的）。

Why not put in two cron entries ? One for 00:00 and one for 13:30 ? I don't think you can do what you want in one entry, since the two minute definitions will apply for both hour definitions (as you've identified).

另一种方法是在00:00执行一个脚本。该脚本将执行原始脚本，然后等待13.5小时，然后再次执行该脚本。这很容易通过一个简单的sleep命令，但我认为这是不直观的，我不知道 cron 如何管理这样长时间运行进程（如果你编辑 crontab - 会杀死生成的作业等等）。

The alternative is perhaps to execute one script at 00:00. That script would execute your original script, then wait 13.5 hours and then execute that script again. It would be easy to do via a simple sleep command, but I think it's unintuitive, and I'm not sure how cron manages such long running processes (what happens if you edit the crontab - does it kill a spawned job etc.)

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