Crontab无法正常工作 [英] Crontab is not working

问题描述

我正在尝试使crontab在我的Linux Mint机器上正常运行.

I am trying to make a crontab working in my Linux Mint machine without success.

我使用以下命令打开crontab:

I open crontab with:

sudo crontab -e

然后我以这种方式编辑文件:

and I edit the file this way:

34 10 * * * root /home/dario/Desktop/back_up/prova_crono.sh

或:

34 10 * * * user /home/dario/Desktop/back_up/prova_crono.sh

，但未执行任何作业.

but no job has been performing.

如果我编写以下脚本，则prova_crono.sh脚本可以正常工作:

The script prova_crono.sh is working if I write:

./prova_crono.sh

所以我真的无法理解问题出在哪里.有什么建议吗?

so I really am not able to understand where is the problem. Any suggestions?

最诚挚的问候

推荐答案

好的，问题在于您的cron不接受用户名作为第六字段.删除root，使您的crontab条目看起来像

Okay, the problem is that your cron does not accept a username as the sixth field. Remove root so your crontab entry looks like

34 10 * * * /home/dario/Desktop/back_up/prova_crono.sh

cron会在root的收件箱中发送大量电子邮件，告诉您类似command not found: root的信息.我建议您不要将此crontab安装在root的crontab中，而应安装在您自己的(dario?)crontab中.这样，失败电子邮件将发送到您的收件箱，而不是root收件箱.

There should be tons of emails in root's inbox sent by cron telling you something like command not found: root. I suggest you install this crontab not in root's crontab, but in your own (dario?) crontab. That way, failure emails are sent to your inbox, not root's.

此外，有99％的用户惊讶地发现从cron继承的PATH几乎是空的.您应该使用

In addition, 99% of users are surprised to find that the PATH inherited from cron is next to empty. You should set it near the top of your script with

 #!/bin/sh
 PATH=$(/usr/bin/getconf PATH)
 ...rest of script...

您可以通过在极为简化的环境中运行脚本来测试其cron就绪性:

You can test the cron-readiness of your script by running it with an extremely reduced environment:

 env -i HOME=$HOME /home/dario/Desktop/back_up/prova_crono.sh

如果这有什么问题，请先修复它，然后再将其安装到crontab中.

If that complains about anything, fix it before installing it in the crontab.

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