Python脚本不运行的cron

问题描述

我试图由cron Python脚本。我使用crontab来运行该命令为用户而不是根源。我的Python脚本有家当在顶部＃！在/ usr /斌/包膜蟒蛇和我做使用chmod + X 它使脚本可执行。

I am trying to run a Python script from cron. I am using crontab to run the command as a user instead of root. My Python script has the shebang at the top #! /usr/bin/env python and I did chmod +x it to make the script executable.

该脚本并从shell中运行它的时候，但使用crontab的时候不起作用。我做了检查 /无功/日志/ cron的文件，看到脚本运行但绝对没有从标准输出或标准错误打印任何地方。

The script does work when running it from a shell but not when using crontab. I did check the /var/log/cron file and saw that the script runs but that absolutely nothing from stdout or stderr prints anywhere.

最后，我做了一个小的脚本，打印日期和一个字符串，并呼吁每一分钟的工作，但这个其它脚本不。我不知道为什么我得到这些变量的结果...

Finally, I made a small script that prints the date and a string and called that every minute that worked but this other script does not. I am not sure why I am getting these variable results...

下面是我在输入的crontab

SHELL=/bin/bash



#min    #hour   day-of-month    month   day-of-week     command
#-------------------------------------------------------------------------
*/5     *       *                *        *             /path/to/script/script.py

下面是我的脚本源$ C ​​$ C，不会从crontab中运行，但会从它在叫的时候像这样 ./ script.py 。该脚本是可执行的我用使用chmod + X 命令后，就可以了，顺便说一句...：

Here is the source code of my script that will not run from crontab but will run from the shell it is in when called like so ./script.py. The script is executable after I use the chmod +x command on it, by the way...:

#! /usr/bin/env python

#create a file and write to it
import time

def create_and_write():
    with open("py-write-out.out", "a+") as w:
        w.write("writing to file. hello from python. :D\n")
        w.write("the time is: " + str(time.asctime()) + "\n")
        w.write("--------------------------------\n")


def main():
    create_and_write()

if __name__ == "__main__":
    main()

修改
我想通了什么事情错了。我需要把绝对的文件路径中的脚本，否则会写一些目录中我还没有计划。

EDITI figured out what was going wrong. I needed to put the absolute file paths in the script otherwise it would write to some directory I had not planned for.

推荐答案

您可以将此自己被以下步骤解决：

You can resolve this yourself by following these steps:

1. 修改的cron为 /path/to/script/script.py＆GT;的/ tmp /日志2 - ; ＆放大器; 1


2. 现在，让我们的cron运行


3. 现在，读取文件的/ tmp /日志


4. 您会发现，你所面对的，这样就可以解决它问题的原因。

在我的经验，这个问题主要是与环境。结果
cron中的ENV变量未设置。所以，你可能要明确设置为ENV的cron中的脚本。

In my experience, the issue is mostly with the environment.
In cron, the env variables are not set. So you may have to explicitly set the env for your script in cron.

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