树莓派上的 Crontab 没有运行

Question

I have a python file on my Raspberry pi and I'm trying to have it run daily. I've checked the script by runing it directly, which works perfectly. But when I set it up in crontab, it's not running on scheduled time. Can someone help me understand what's going wrong?

Here's what I put in crontab

27 09 * * * /usr/bin/python3 /home/pi/myfile.py

I feel it might be related the python version? At the beginning of my python script I have this line #!/usr/bin/env python

Answer 1

The shebang-Line ( #!/usr/bin/env python ) is only used when called by a shell to determine the interpreter to use.

If your script works with

/usr/bin/python3 /home/pi/myfile.py

in your shell, it should work in the Crontab File.

If it does not it is a possibility that the python script is not compatible with Python3 and you need to use Python 2. You may test your script with either

/usr/bin/python /home/pi/myfile.py

or simply

/home/pi/myfile.py

If either of these commands will run the script without problem use this command in your contab.