/usr/ is in ruby-metaclass 0.0.1-2.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/
/usr/lib/ruby/
/usr/lib/ruby/vendor_ruby/
/usr/lib/ruby/vendor_ruby/metaclass/
/usr/lib/ruby/vendor_ruby/metaclass/object_methods.rb
/usr/lib/ruby/vendor_ruby/metaclass/version.rb
/usr/lib/ruby/vendor_ruby/metaclass.rb
/usr/share/
/usr/share/rubygems-integration/
/usr/share/rubygems-integration/1.8/
/usr/share/rubygems-integration/1.8/specifications/
/usr/share/rubygems-integration/1.8/specifications/metaclass-0.0.1.gemspec
/usr/share/rubygems-integration/1.9.1/
/usr/share/rubygems-integration/1.9.1/specifications/
/usr/share/rubygems-integration/1.9.1/specifications/metaclass-0.0.1.gemspec
/usr/share/doc/
/usr/share/doc/ruby-metaclass/
/usr/share/doc/ruby-metaclass/README.md
/usr/share/doc/ruby-metaclass/copyright
/usr/share/doc/ruby-metaclass/changelog.Debian.gz