my $var;
while (...) {
   ++$var;
   ...
}

[download]
And for "every third", 
my $var;
while (...) {
   ++$var;
   ...
   if ($var % 3 == 0) {
      # Stuff for every third pass.
      ...
   }
}

[download]

In reply to Re: Auto Incrementing Variable in While Statement by ikegami
in thread Auto Incrementing Variable in While Statement by htmanning

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