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I used to have only one Python script, the output of which would be directed to a log file.

It works like this: I have it in autostart, using crontab

@reboot /bin/sleep 30; sudo /usr/bin/python3 -u /home/admin/Desktop/main/main.py >> /home/admin/Desktop/main/log.log

This just waits 30 seconds after reboot to start the python script and direct the output to the log file.

Now I made a second python script, which basically watches over the activity of that script, but also writing any relevant data to that same log file. I added it just the same way I did the one before:

@reboot /bin/sleep 40; sudo /usr/bin/python3 -u /home/admin/Desktop/main/mainWatchdog.py >> /home/admin/Desktop/main/log.log

However, my problem right now is, that any output of the watchdog is not written to the log file.

I am not too familiar with this topic, so I am not sure if it's even possible to write to the same file using this method.

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  • Maybe the watchdog output is redirected to stderr. Try something like: python_pogram &>>/home/admin/Desktop/main/log.log or python_pogram >> /home/admin/Desktop/main/log.log 2>&1
    – Edgar Magallon
    Commented Dec 22, 2023 at 0:00
  • 2
    Not sure what you're running (you don't mention it), but consider using a systemd service instead of a crontab and collect logs using journalctl instead of logging to a file on disk.
    – Panki
    Commented Dec 22, 2023 at 1:17

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