APM: Dumb program acting funny...

[Bill Raty]

You have warnings enabled 'the -w switch on shebang'.

With warnings enabled perl will output a message whenever it detects an
undefined value in a join or string interpolation.  To demonstrate:

  use warnings;
  use strict;

  my $empty = undef;
  print "Perl will warn about this $empty string.\n";

I rarely use warnings in production code.  It is better to locally scope
warnings in code sections where you are certain you must always have data
that is not null.

Regards,

-Bill
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