As you get acquainted with Pod::Usage, consider the normal layout of manual pages, and use it. You'll find that Pod::Usage::pod2usage provides the means to display just the SYNOPSIS portion or the whole manual. As for testing that the user gives you exactly one command-line "option":

#!/usr/bin/perl

=head1 NAME

name_of_utility_or_module

=head1 SYNOPSIS

  brief example/template/summary of typical use(s), e.g.:

  prog_name -d
  prog_name -h
  prog_name -p foobar

=head1 DESCRIPTION

Paragraphs that describe the purpose, usage and various
behaviors of the utility or module in suitable detail...

=cut

use strict;
use Getopt::Std;
use Pod::Usage;

my %opt;
getopts('dp:h', \%opt);

pod2usage(2) if (keys %opt != 1);  # die here if too many options were
+ given

print "ok, here we go...\n";

if ( $opt{d} ) { 
   # do this..
}
if ( $opt{p} ) {
   # do that...
}
if ( $opt{h} ) {
    pod2usage(-exitstatus => 0, -verbose => 2); # exit & show full man
+ page
}
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