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There is a certain amount of flexibility on how duplicate is determined:
- when comparing content, various hashing algorithm is supported;
- when comparing size, a certain tolerance % is allowed;
- when comparing filename, munging can first be done.

There is flexibility on what to do with duplicate files:
- just print unique/duplicate files (and let other utilities down the pipe deal
  with them);
- move duplicates to some location;
- open the files first and prompt for action;
- let a Perl code process the files.

Interface is loosely based on the C<uniq> Unix command-line program.

=head1 OPTIONS

C<*> marks required options.

=head2 Main options