用户 crontab +蟒蛇 +随机壁纸=不起作用？
我有一个 python 脚本，可以通过 gconf 将桌面壁纸正确设置为给定文件夹中的随机图片。
然后，我的 crontab 中有以下条目
* * * * * python /home/bolster/bin/change-background.py
并且 syslog 正确报告执行情况
Apr 26 14:11:01 bolster-desktop CRON[9751]: (bolster) CMD (python /home/bolster/bin/change-background.py)
Apr 26 14:12:01 bolster-desktop CRON[9836]: (bolster) CMD (python /home/bolster/bin/change-background.py)
Apr 26 14:13:01 bolster-desktop CRON[9860]: (bolster) CMD (python /home/bolster/bin/change-background.py)
Apr 26 14:14:01 bolster-desktop CRON[9905]: (bolster) CMD (python /home/bolster/bin/change-background.py)
Apr 26 14:15:01 bolster-desktop CRON[9948]: (bolster) CMD (python /home/bolster/bin/change-background.py)
Apr 26 14:16:01 bolster-desktop CRON[9983]: (bolster) CMD (python /home/bolster/bin/change-background.py)
，但没有桌面变化，有什么想法吗？
I have a python script that correctly sets the desktop wallpaper via gconf to a random picture in a given folder.
I then have the following entry in my crontab
* * * * * python /home/bolster/bin/change-background.py
And syslog correctly reports execution
Apr 26 14:11:01 bolster-desktop CRON[9751]: (bolster) CMD (python /home/bolster/bin/change-background.py)
Apr 26 14:12:01 bolster-desktop CRON[9836]: (bolster) CMD (python /home/bolster/bin/change-background.py)
Apr 26 14:13:01 bolster-desktop CRON[9860]: (bolster) CMD (python /home/bolster/bin/change-background.py)
Apr 26 14:14:01 bolster-desktop CRON[9905]: (bolster) CMD (python /home/bolster/bin/change-background.py)
Apr 26 14:15:01 bolster-desktop CRON[9948]: (bolster) CMD (python /home/bolster/bin/change-background.py)
Apr 26 14:16:01 bolster-desktop CRON[9983]: (bolster) CMD (python /home/bolster/bin/change-background.py)
But no desktopy changey, Any ideas?
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您的脚本取决于
DISPLAY环境变量，该变量在您从 X 会话中的 shell 执行脚本时设置，但在从 cron 运行脚本时取消设置。Your script depends on the
DISPLAYenvironment variable, which is set when you execute the script from the shell in an X session, but unset when the script is run from cron.要设置 DISPLAY 环境变量，我会将其直接放入 crontab 中。另外，我将使脚本可执行并为其提供适当的标头（
#!/usr/bin/env python），以便可以直接执行。此外，您可以依赖在 crontab 运行时将 PWD 设置为 HOME。我的 crontab 看起来像这样：
您还可以设置 PATH（以与 DISPLAY 相同的方式），这样就不需要
bin/了。在 crontab 中设置环境的主要问题是值不是变量插值的。例如，这不会给出预期的结果：
To set the DISPLAY environment variable, I would put it directly in the crontab. Also, I would make the script executable and give it a proper header (
#!/usr/bin/env python) so that it can be executed directly. Additionally, you can rely on the PWD being set to HOME when the crontab runs.My crontab would look like this:
You can also set the PATH (in the same manner as DISPLAY) so that the
bin/is not even needed.The main gotcha for setting environment in the crontab is that values are not variable-interpolated. For example, this not give the expected results:
根据 Bolo 的观察，我忘记了将 DISPLAY 构建到脚本或 crontab 中。
最简单的解决方案是在 crontab 前面添加
env DISPLAY=:0.0这样：
As per Bolo's observation, I forgot about building in the DISPLAY into either the script or the crontab.
Easiest solution is to prepend the crontab with
env DISPLAY=:0.0so: