/usr/ is in ruby-redis-rack 1.5.0-7.
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/redis/
/usr/lib/ruby/vendor_ruby/redis/rack/
/usr/lib/ruby/vendor_ruby/redis/rack/version.rb
/usr/lib/ruby/vendor_ruby/redis-rack.rb
/usr/lib/ruby/vendor_ruby/rack/
/usr/lib/ruby/vendor_ruby/rack/session/
/usr/lib/ruby/vendor_ruby/rack/session/redis.rb
/usr/share/
/usr/share/doc/
/usr/share/doc/ruby-redis-rack/
/usr/share/doc/ruby-redis-rack/README.md
/usr/share/doc/ruby-redis-rack/copyright
/usr/share/doc/ruby-redis-rack/changelog.Debian.gz
/usr/share/rubygems-integration/
/usr/share/rubygems-integration/all/
/usr/share/rubygems-integration/all/specifications/
/usr/share/rubygems-integration/all/specifications/redis-rack-1.5.0.gemspec