/usr/ is in ruby-rubypants 0.6.0-1.
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/rubypants/
/usr/lib/ruby/vendor_ruby/rubypants/core.rb
/usr/lib/ruby/vendor_ruby/rubypants/version.rb
/usr/lib/ruby/vendor_ruby/rubypants.rb
/usr/share/
/usr/share/doc/
/usr/share/doc/ruby-rubypants/
/usr/share/doc/ruby-rubypants/README.rdoc
/usr/share/doc/ruby-rubypants/changelog.Debian.gz
/usr/share/doc/ruby-rubypants/copyright
/usr/share/rubygems-integration/
/usr/share/rubygems-integration/all/
/usr/share/rubygems-integration/all/specifications/
/usr/share/rubygems-integration/all/specifications/rubypants-0.6.0.gemspec