Monitor cron jobs on Ubuntu

If you need to monitor cron jobs to verify they run for a particular user open the terminal and type, $USER being the currently logged on user:

$ tail -F /var/log/syslog | egrep 'CRON.*'$USER

OR

$ SOME_USER="root"
$ tail -F /var/log/syslog | egrep 'CRON.*'$SOME_USER

You could also call tail using Python in a timed while loop with subprocess in a thread and post results to a GTK list or create a shell script so you can call the command something shorter, like cronwatch.