This is Perl module App::YG.
App::YG installation is straightforward. If your CPAN shell is set up, you should just be able to do
% cpan App::YG
Download it, unpack it, then build it as per the usual:
% perl Makefile.PL % make && make test
Then install it:
% sudo make install
App::YG documentation is available as in POD. So you can do:
% perldoc App::YG
App::YG is hosted on github http://github.com/bayashi/App-YG
This module is free software; you can redistribute it and/or modify it under the same terms as Perl itself. See perlartistic.
Dai Okabayashi <email@example.com>