How do I make sure my bash script isn't already running?

Question

I have a bash script I want to run every 5 minutes from cron... but there\'s a chance the previous run of the script isn\'t done yet... in this case, i want the new run to j

Answer 1

You might want to have a look at the man page for the flock command, if you're lucky enough to get it on your distribution.

NAME
       flock - Manage locks from shell scripts
SYNOPSIS
       flock [-sxon] [-w timeout] lockfile [-c] command...