You're getting the warning because when you invoke the CGI from the command line, you're not defining the form variable Submit. A quick workaround is to change   if ($cgi->param('Submit') eq "Go") ... to 
  my $submit = $cgi->param('Submit') || "";
  if ($submit eq "Go") ...

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This ensures that you'll be testing against a defined value.

In reply to Re: Help with uninitialized value warning by dws
in thread Help with uninitialized value warning by XplodBoom

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