/usr/ is in ruby-sinatra-contrib 1.4.1-1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/
/usr/share/rubygems-integration/
/usr/share/rubygems-integration/1.9.1/
/usr/share/rubygems-integration/1.9.1/specifications/
/usr/share/rubygems-integration/1.9.1/specifications/sinatra-contrib-1.4.1.gemspec
/usr/share/rubygems-integration/2.0/
/usr/share/rubygems-integration/2.0/specifications/
/usr/share/rubygems-integration/2.0/specifications/sinatra-contrib-1.4.1.gemspec
/usr/share/doc/
/usr/share/doc/ruby-sinatra-contrib/
/usr/share/doc/ruby-sinatra-contrib/README.md
/usr/share/doc/ruby-sinatra-contrib/changelog.Debian.gz
/usr/share/doc/ruby-sinatra-contrib/copyright
/usr/share/doc/ruby-sinatra-contrib/ideas.md
/usr/lib/
/usr/lib/ruby/
/usr/lib/ruby/vendor_ruby/
/usr/lib/ruby/vendor_ruby/sinatra/
/usr/lib/ruby/vendor_ruby/sinatra/json.rb
/usr/lib/ruby/vendor_ruby/sinatra/capture.rb
/usr/lib/ruby/vendor_ruby/sinatra/respond_with.rb
/usr/lib/ruby/vendor_ruby/sinatra/content_for.rb
/usr/lib/ruby/vendor_ruby/sinatra/test_helpers.rb
/usr/lib/ruby/vendor_ruby/sinatra/reloader.rb
/usr/lib/ruby/vendor_ruby/sinatra/namespace.rb
/usr/lib/ruby/vendor_ruby/sinatra/link_header.rb
/usr/lib/ruby/vendor_ruby/sinatra/decompile.rb
/usr/lib/ruby/vendor_ruby/sinatra/extension.rb
/usr/lib/ruby/vendor_ruby/sinatra/contrib.rb
/usr/lib/ruby/vendor_ruby/sinatra/engine_tracking.rb
/usr/lib/ruby/vendor_ruby/sinatra/multi_route.rb
/usr/lib/ruby/vendor_ruby/sinatra/contrib/
/usr/lib/ruby/vendor_ruby/sinatra/contrib/all.rb
/usr/lib/ruby/vendor_ruby/sinatra/contrib/setup.rb
/usr/lib/ruby/vendor_ruby/sinatra/contrib/version.rb
/usr/lib/ruby/vendor_ruby/sinatra/streaming.rb
/usr/lib/ruby/vendor_ruby/sinatra/cookies.rb
/usr/lib/ruby/vendor_ruby/sinatra/config_file.rb