/usr/ is in ruby-rash-alt 0.4.3-1.
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/hashie/
/usr/lib/ruby/vendor_ruby/hashie/mash/
/usr/lib/ruby/vendor_ruby/hashie/mash/rash.rb
/usr/lib/ruby/vendor_ruby/rash/
/usr/lib/ruby/vendor_ruby/rash/version.rb
/usr/lib/ruby/vendor_ruby/rash.rb
/usr/share/
/usr/share/doc/
/usr/share/doc/ruby-rash-alt/
/usr/share/doc/ruby-rash-alt/README.rdoc
/usr/share/doc/ruby-rash-alt/changelog.Debian.gz
/usr/share/doc/ruby-rash-alt/copyright
/usr/share/rubygems-integration/
/usr/share/rubygems-integration/all/
/usr/share/rubygems-integration/all/specifications/
/usr/share/rubygems-integration/all/specifications/rash_alt-0.4.3.gemspec