Run cron job only if it isn't already running

Question

I\'m trying to set up a cron job as a sort of watchdog for a daemon that I\'ve created. If the daemon errors out and fails, I want the cron job to periodically restart it...

Answer 1

I would recommend to use an existing tool such as monit, it will monitor and auto restart processes. There is more information available here. It should be easily available in most distributions.