This is Perl module WWW::Shorten::RevCanonical.

INSTALLATION

WWW::Shorten::RevCanonical installation is straightforward. If your CPAN shell is set up,
you should just be able to do

   % cpan WWW::Shorten::RevCanonical

Download it, unpack it, then build it as per the usual:

   % perl Makefile.PL
   % make && make test

Then install it:

   % make install

DOCUMENTATION

WWW::Shorten::RevCanonical documentation is available as in POD. So you can do:

   % perldoc WWW::Shorten::RevCanonical

to read the documentation online with your favorite pager.

Tatsuhiko Miyagawa