/usr/ is in ruby-ferret 0.11.8.6-1build3.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/ruby/
/usr/lib/ruby/vendor_ruby/
/usr/bin/
/usr/bin/ferret-browser
/usr/lib/
/usr/lib/x86_64-linux-gnu/
/usr/lib/x86_64-linux-gnu/ruby/
/usr/lib/x86_64-linux-gnu/ruby/vendor_ruby/
/usr/lib/x86_64-linux-gnu/ruby/vendor_ruby/2.3.0/
/usr/lib/x86_64-linux-gnu/ruby/vendor_ruby/2.3.0/ferret_ext.so
/usr/lib/ruby/vendor_ruby/ferret.rb
/usr/lib/ruby/vendor_ruby/ferret/
/usr/lib/ruby/vendor_ruby/ferret/document.rb
/usr/lib/ruby/vendor_ruby/ferret/index.rb
/usr/lib/ruby/vendor_ruby/ferret/field_infos.rb
/usr/lib/ruby/vendor_ruby/ferret/number_tools.rb
/usr/lib/ruby/vendor_ruby/ferret/field_symbol.rb
/usr/lib/ruby/vendor_ruby/ferret/version.rb
/usr/lib/ruby/vendor_ruby/ferret/browser.rb
/usr/lib/ruby/vendor_ruby/ferret/browser/
/usr/lib/ruby/vendor_ruby/ferret/browser/s/
/usr/lib/ruby/vendor_ruby/ferret/browser/s/style.css
/usr/lib/ruby/vendor_ruby/ferret/browser/s/global.js
/usr/lib/ruby/vendor_ruby/ferret/browser/webrick.rb
/usr/lib/ruby/vendor_ruby/ferret/browser/views/
/usr/lib/ruby/vendor_ruby/ferret/browser/views/layout.rhtml
/usr/lib/ruby/vendor_ruby/ferret/browser/views/term/
/usr/lib/ruby/vendor_ruby/ferret/browser/views/term/termdocs.rhtml
/usr/lib/ruby/vendor_ruby/ferret/browser/views/term/index.rhtml
/usr/lib/ruby/vendor_ruby/ferret/browser/views/document/
/usr/lib/ruby/vendor_ruby/ferret/browser/views/document/list.rhtml
/usr/lib/ruby/vendor_ruby/ferret/browser/views/document/show.rhtml
/usr/lib/ruby/vendor_ruby/ferret/browser/views/help/
/usr/lib/ruby/vendor_ruby/ferret/browser/views/help/index.rhtml
/usr/lib/ruby/vendor_ruby/ferret/browser/views/term-vector/
/usr/share/man/man1/ferret-browser.1.gz
/usr/lib/ruby/vendor_ruby/ferret/browser/views/term-vector/index.rhtml
/usr/lib/ruby/vendor_ruby/ferret/browser/views/error/
/usr/lib/ruby/vendor_ruby/ferret/browser/views/error/index.rhtml
/usr/lib/ruby/vendor_ruby/ferret/browser/views/home/
/usr/lib/ruby/vendor_ruby/ferret/browser/views/home/index.rhtml
/usr/share/
/usr/share/rubygems-integration/
/usr/share/rubygems-integration/2.3.0/
/usr/share/rubygems-integration/2.3.0/specifications/
/usr/share/rubygems-integration/2.3.0/specifications/ferret-0.11.8.6.gemspec
/usr/share/doc/
/usr/share/doc/ruby-ferret/
/usr/share/doc/ruby-ferret/TUTORIAL.gz
/usr/share/doc/ruby-ferret/RELEASE_NOTES
/usr/share/doc/ruby-ferret/copyright
/usr/share/doc/ruby-ferret/changelog.Debian.gz
/usr/share/doc/ruby-ferret/README
/usr/share/man/
/usr/share/man/man1/