/usr/ is in ruby-ruby2ruby 2.0.7-1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/rubygems-integration/2.0/
/usr/bin/
/usr/bin/r2r_show
/usr/share/
/usr/share/rubygems-integration/
/usr/share/rubygems-integration/1.9.1/
/usr/share/rubygems-integration/1.9.1/specifications/
/usr/share/rubygems-integration/1.9.1/specifications/ruby2ruby-2.0.7.gemspec
/usr/share/rubygems-integration/2.0/specifications/
/usr/share/rubygems-integration/2.0/specifications/ruby2ruby-2.0.7.gemspec
/usr/share/doc/
/usr/share/doc/ruby-ruby2ruby/
/usr/share/doc/ruby-ruby2ruby/README.txt
/usr/share/doc/ruby-ruby2ruby/copyright
/usr/share/doc/ruby-ruby2ruby/changelog.Debian.gz
/usr/lib/
/usr/lib/ruby/
/usr/lib/ruby/vendor_ruby/
/usr/lib/ruby/vendor_ruby/ruby2ruby.rb