Cron - any advanced options?

[Kurian Thayil <kurianmthayil@gmail.com>]

Hi All,

 

I have 3 cron jobs enabled and all are relating to RSYNC. Now, all of these scripts are run once in every 7 minutes all day. The problem occurs when the scripts doesn't finish to execute in 7 minutes. This will result in starting execution of the same script again and this will malfunction the setup. 

Is there an option in CRON, which always check if CRON has started the process and is already running? Cron should execute the script only if the the process isn't running already. Any hints on this?

Regards,

Kurian Thayil.