/usr/ is in ruby-rc4 0.1.5-2.
This file is owned by root:root, with mode 0o755.
..
/usr/share/rubygems-integration/1.9.1/
/usr/share/rubygems-integration/1.9.1/specifications/
/usr/lib/
/usr/lib/ruby/
/usr/lib/ruby/vendor_ruby/
/usr/lib/ruby/vendor_ruby/rc4.rb
/usr/share/
/usr/share/rubygems-integration/
/usr/share/rubygems-integration/1.9.1/specifications/ruby-rc4-0.1.5.gemspec
/usr/share/rubygems-integration/1.8/
/usr/share/rubygems-integration/1.8/specifications/
/usr/share/rubygems-integration/1.8/specifications/ruby-rc4-0.1.5.gemspec
/usr/share/doc/
/usr/share/doc/ruby-rc4/
/usr/share/doc/ruby-rc4/README.md
/usr/share/doc/ruby-rc4/changelog.Debian.gz
/usr/share/doc/ruby-rc4/copyright