@reboot cronjob not executing

Question

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\'
             


        

Answer 1

From what I've discovered just now, the @reboot syntax seems to depend on what crontab you're editing. I found that for the system-level /etc/cron.d/ folder, entries there must have a user, just like regular time-based crons.

Thus this worked for me, on Ubuntu 14.04, to run the specified command as root on startup:

@reboot root /home/vagrant/log.sh