Is perl's file check IO intensive?
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I've come up with a way to turn on debugging without having to edit any scripts.  Simply touching the filename with .debug turns on my debugging.

    $ touch fancy.pl.debug

My fear is that the filecheck (Being at the very start of EVERY script) might be IO intensive in some way

    $opts{d}++ if (-e "$0.debug");

Could this be true?  Is there a better way to do this check or turn on/off debugging in many scripts?
