I was not aware of the /all switch. Thanks! That's very useful.

Just to round out the thread:

#! Perl -w
use strict;

open (READ, "ipconfig /all|") or die "$!";
  while (<READ>) {
       chomp;
            if (/Physical Address/) {
                my @pieces =    split(/:/);
               print $pieces[1];
            }
  }
  close READ;
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