@reboot cronjob未执行 [英] @reboot cronjob not executing

问题描述

我有一个Python脚本，它只是写一些文本并保存到一个文件中。

 ＃！ / usr / bin / python3 
 def main（）：
 filename ='/home/user/testHello.txt'
 openfile = open（filename，w）
 print （Hello CRON，file = openfile）
如果__name__ ==__main__：
 main（）; 
  

我想在启动时通过CRON执行这个脚本。所以我使用

编辑crontab列表。

 > crontab -e 
  pre> 
 
 
我的整个crontab看起来像：
  SHELL = / bin / bash 
 PATH = / sbin：/ bin：/ usr / sbin：/ usr / bin 
 MAILTO = root 
 HOME = / 
＃run-parts 
 1 * * * * /home/user/tester.py 
 @reboot /home/user/tester.py 
  
这是文件的位置，并且该文件具有执行权限。我可以运行文件没有问题作为脚本从命令行。然而，当我重新启动机器，没有生成文件。我试图理解为什么，并玩crontab条目。
  @reboot / usr / bin / python3 / home / user / tester.py 
  
这也无效。
 
 
 
编辑：
  ps aux | grep crond 
  
给我
  user 2259 0.0 0.0。 9436 948 pts / 0 S + 23:39 0:00 grep --color = auto crond 
  
不确定如何检查crond是否正在运行，或者如果有问题的用户在CRON之前/之后安装。我将尝试：
  sudo crontab -e 
   
 
 
运行：
  pgrep cron 
  
返回957 
解决方案
 Mark Roberts指出了一些我做错了的事情。 
 
 
 
也就是这里的空间
  MAIL = root 
 HOME = / 
  
删除这些空格。
 
 
 
接下来，将Cron配置固定为电子邮件每分钟..而不是我有：
  * / 1 * * * * /home/user/tester.py 
  
看来我Lubuntu不支持@Reboot Cron语法。
 
I have a Python script which simply writes some text and saves it to a file
#! /usr/bin/python3
def main():
     filename = '/home/user/testHello.txt'
     openfile = open(filename,"w")
     print("Hello CRON", file = openfile)
if __name__ == "__main__":
     main();
I want to execute this script at startup via CRON.  So I edit the crontab listing by using
>crontab -e
My entire crontab looks like :
SHELL = /bin/bash
PATH = /sbin:/bin:/usr/sbin:/usr/bin
MAILTO = root
HOME = /
# run-parts
1 * * * * /home/user/tester.py
@reboot /home/user/tester.py
This is the location of the file, and the file has permissions to execute.  I can run the file no problem as a script from the commandline.  Yet when I restart the machine, no file is generated.  I am trying to understand why, and played around with the crontab entry.
@reboot /usr/bin/python3 /home/user/tester.py
This didn't work either.

Edit: 
ps aux | grep crond 
gives me
user     2259 0.0 0.0.  9436  948 pts/0 S+ 23:39   0:00 grep --color=auto crond
I am unsure how to check if crond is running, or if the user in question is mounted before/after CRON.  I'll try with:
sudo crontab -e 
but that hasn't worked either.

Running:
pgrep cron
returns 957
解决方案
Mark Roberts pointed out a few things I'd done wrong. 

Namely, the spaces here
MAIL = root
HOME = /
Get rid of those spaces..

Next, having Cron configuration fixed to email every minute.. instead of what I had :
*/1 * * * * /home/user/tester.py
Seems to me Lubuntu doesn't support the @Reboot Cron syntax.

                        
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