Getopt::Std::getopt simply fills the %opt hash with keys d, h or p (setting values to 1). You then delete all the values of the hash by your second "%opts =" assignment.

For example, using the -d switch on your command line fills the hash with the following after the getopt call:

$VAR1 = {
          'd' => 1
        };
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You then overwrite the hash entirely.

I don't think Getopt::Std works the way you want it to. Perhaps Getopt::Long does (User defined subroutines to handle options).