I start with -w and use strict so I generally catch errors as I go. I use a lot of print statements as I am creating a script to make sure everything is where I expect it to be, and if I am stuck chasing something specific, good old perl -d usually does the trick.
-Kevin
my $a='62696c6c77667269656e6440676d61696c2e636f6d';
while ($a=~m/(^.{2})/s)
{print unpack('A',pack('H*',"$1"));$a=~s/^.{2}//s;}
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