/usr/ is in ruby-rack-rewrite 1.3.3-1.
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/rack/
/usr/lib/ruby/vendor_ruby/rack/rewrite/
/usr/lib/ruby/vendor_ruby/rack/rewrite/rule.rb
/usr/lib/ruby/vendor_ruby/rack/rewrite/version.rb
/usr/lib/ruby/vendor_ruby/rack/rewrite.rb
/usr/lib/ruby/vendor_ruby/rack-rewrite.rb
/usr/share/
/usr/share/rubygems-integration/
/usr/share/rubygems-integration/1.8/
/usr/share/rubygems-integration/1.8/specifications/
/usr/share/rubygems-integration/1.8/specifications/rack-rewrite-1.3.3.gemspec
/usr/share/rubygems-integration/1.9.1/
/usr/share/rubygems-integration/1.9.1/specifications/
/usr/share/rubygems-integration/1.9.1/specifications/rack-rewrite-1.3.3.gemspec
/usr/share/doc/
/usr/share/doc/ruby-rack-rewrite/
/usr/share/doc/ruby-rack-rewrite/copyright
/usr/share/doc/ruby-rack-rewrite/changelog.Debian.gz