grep myperlscript will always output the PID of the grep process. If you're already running Linux, I recommend looking at Highlander - allow only one invocation at a time of an expensive CGI script, which should give you an idea of how to limit a script to at most one instance.

Alternatively, use grep [m]yperlscript, which is a command line that will not match itself.

In reply to Re^2: Unwanted instances of perl script by Corion
in thread Unwanted instances of perl script by rafalwoycicki

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