Cron job cannot read the previous cron logs

  cron, python, python-3.x

In order to detect a fault that would happen in my cron job, I set an other cron job to check the previous log issued by the crontab:

def check_last_cron():
    with open('/home/pi/Desktop/cron_output.log') as f:
        txt = f.read()
        f.close()
        if 'Traceback' in txt:
            print('Traceback detected')
            send_to_phone(txt)
        else:
            print('no Traceback detected')

When run manually, everything goes well:

  • the script reads
  • detects the word "Traceback"
  • sends me the log

Crontab:

*/5 * * * * python3 /home/pi/Desktop/initialize.py > /home/pi/Desktop/cron_output.log 2>&1
*/5 * * * * python3 /home/pi/Desktop/checker.py > /home/pi/Desktop/log.log 2>&1

But when run with the crontab, the log read is empty. What am I missing ?

Source: Python-3x Questions

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