如何将 cronjob 设置为 2 天? [英] how to set cronjob for 2 days?

问题描述

我们想使用 cronjob 来创建数据库备份.

We would like to use a cronjob to create a database backup.

备份应该每两天进行一次.可以使用以下cron-entry吗?

The backup should occur ones every two days. Can the following cron-entry be used?

0 0 2 * * * backup-command

如果这是错误的，请告诉我设置 cron 2 天的正确命令.

If this is wrong please tell me the correct command for setting the cron for 2 days.

推荐答案

来自 这里:

Cron 还支持 'step' 值.

Cron also supports 'step' values.

dom 字段中的 */2 值将意味着该命令每两天运行一次同样，小时字段中的 */5将意味着该命令每 5 次运行一次小时.例如

A value of */2 in the dom field would mean the command runs every two days and likewise, */5 in the hours field would mean the command runs every 5 hours. e.g.

* 12 10-16/2 * * root backup.sh

等同于:

* 12 10,12,14,16 * * root backup.sh

所以我想你想要0 0 */2 * *.

您所拥有的 (0 0 2 * *) 将在每月 2 日午夜运行该命令.

What you've got (0 0 2 * *) will run the command on the 2nd of the month at midnight, every month.

附言您的答案中似乎多了一个星号.格式应为:

p.s. You seem to have an extra asterisk in your answer. The format should be:

minute hour dom month dow user cmd

因此，您的额外星号将位于 user 字段中.这是故意的吗?

So your extra asterisk would be in the user field. Is that intended?

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