Cron Job仅在一周的特定日期运行几天 [英] Cron Job to run on a range of days only on a particular day of week

问题描述

0 0 2-31 * sun         /home/ubuntu/x.h
0 0 2-31 * mon-sat     /home/ubuntu/y.h

这最终会同时运行它们。我在这里做错了吗？

This ends up running both of them. Am I doing something wrong here?

推荐答案

这是crontab格式：

This is the crontab format:

* * * * *
| | | | |
| | | | +---- Day of the Week   (range: 0-6, 0 standing for Sunday)
| | | +------ Month of the Year (range: 1-12)
| | +-------- Day of the Month  (range: 1-31)
| +---------- Hour              (range: 0-23)
+------------ Minute            (range: 0-59)

Ubuntu man 5 crontab 说：

  field          allowed values
  -----          --------------
  minute         0-59
  hour           0-23
  day of month   1-31
  month          1-12 (or names, see below)
  day of week    0-7 (0 or 7 is Sun, or use names)

因此，这应该对您有用：

So, this should work for you:

0 0 2-31 * 0         /home/ubuntu/x.h
0 0 2-31 * 1-6       /home/ubuntu/y.h

我不确定为什么在周六运行7-您的系统时间是否正确且在正确的时区？

I'm not sure why 7 would run on Saturday--is your system time accurate and in the right timezone?

编辑：嗯，是的，很遗憾，您不能同时指定星期几和每月几号。从 man 5 crontab 开始：

Edit: Ah, yes, unfortunately you cannot specify both the day of the week and the day of the month. From man 5 crontab:

注意：命令的执行日期可以是由两个字段指定-每月的日期和星期几。如果两个字段都受限制（即不是*），则当任一字段与当前时间匹配时，将运行该命令。例如， 30 4 1,15 * 5会导致命令在每月的1号和15号的凌晨4:30以及每个星期五运行。但是，可以通过在命令中添加测试来获得所需的结果（请参见下面的示例CRON文件中的最后一个示例）。

Note: The day of a command's execution can be specified by two fields — day of month, and day of week. If both fields are restricted (i.e., aren't *), the command will be run when either field matches the current time. For example, ``30 4 1,15 * 5'' would cause a command to be run at 4:30 am on the 1st and 15th of each month, plus every Friday. One can, however, achieve the desired result by adding a test to the command (see the last example in EXAMPLE CRON FILE below).

因此，答案是：

0 0 2-31 * *       test $(date +\%u) -eq 7 && /home/ubuntu/x.h
0 0 2-31 * *       test $(date +\%u) -ne 7 && /home/ubuntu/y.h

$（date'+％u'） 返回1-7，代表星期一至星期日。以 echo $（date'+％u'）为例。

$(date '+%u') returns 1-7 representing Monday thru Sunday. Try echo $(date '+%u') for an example.

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