A Bash snippet

We have a problem with Cron we cannot debug, very seldom but it happens Cron goes wild and incorrectly submits jobs. We have not been able to debug and fix the problem. We only schedule shell scripts (Bash) in Cron so I wrote a snippet to add at the beginning of such shell scripts to prevent execution daytime:

This snippet is far from perfect but it should capture most of these "spurious" submits, until we find the cause, if the submit is trapped by the snippet we will have some more info about the incident and hopefully catch the bug(ger).