Cron作业创建空文件每次运行 [英] Cron job creating empty file each time it runs

问题描述

我有一个php脚本我想运行每一分钟，看看是否有新闻稿需要张贴。我在cPanel中使用wget的cron命令，但我注意到（几天后），这是在主目录中创建一个空白文件，每次运行。

谢谢。

解决方案

当wget运行时，默认情况下，它会从我需要记住的内容生成一个输出文件。

您可能需要使用wget的一些选项并且使用 / dev / null 作为目标文件（这是一个特殊文件，它将写入）

从man w判断， -O 或 - output-file 选项将是一个很好的候选项：

-O文件

- output-document = file

文档不会被写入

因此，您可能需要使用类似这样的文件：

  wget -O / dev / null http://www.example.com/your-script.php 
  

并且，btw，从crontab运行的脚本输出通常被重定向到日志文件 - 它总是可以帮助。 >

这样可能会有帮助：

  wget -O / dev / null http://www.example.com/your-script.php>> /YOUR_PATH_logfile.log 
  

您可能还想将错误输出重定向到另一个文件可以有用，帮助调试，一天出错）：

  wget -O / dev / null http://www.example.com/your-script.php>> /YOUR_PATH/log-output.log 2>>> /YOUR_PATH/log-errors.log 
  

I have a php script I want to run every minute to see if there are draft news posts that need to be posted. I was using "wget" for the cron command in cPanel, but i noticed (after a couple days) that this was creating a blank file in the main directory every single time it ran. Is there something I need to stop that from happening?

Thanks.

解决方案

When wget runs, by default, it generates an output file, from what I need to remember.

You probably need to use some option of wget, to specify to which file it should write its output -- and use /dev/null as destination file (It's a "special file" that will "eat" everything you can write to it)

Judging from man wget, the -O or --output-file option would be a good candidate :

-O file
--output-document=file
The documents will not be written to the appropriate files, but all will be concatenated together and written to file.

so, you might need to use something like this :

wget -O /dev/null http://www.example.com/your-script.php

And, btw, the output of scripts run from the crontab is often redirected to a logfile -- it can always help.

Something like this might help, about that :

wget -O /dev/null http://www.example.com/your-script.php >> /YOUR_PATH_logfile.log

And you might also want to redirect the error output to another file (can be useful, to help with debugging, the day something goes wrong) :

wget -O /dev/null http://www.example.com/your-script.php >>/YOUR_PATH/log-output.log 2>>/YOUR_PATH/log-errors.log

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