/usr/ is in ruby-redis-rack 2.0.2-2.
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..
/usr/lib/ruby/vendor_ruby/redis/rack/
/usr/lib/
/usr/lib/ruby/
/usr/lib/ruby/vendor_ruby/
/usr/lib/ruby/vendor_ruby/rack/
/usr/lib/ruby/vendor_ruby/rack/session/
/usr/lib/ruby/vendor_ruby/rack/session/redis.rb
/usr/lib/ruby/vendor_ruby/redis/
/usr/lib/ruby/vendor_ruby/redis/rack/version.rb
/usr/lib/ruby/vendor_ruby/redis-rack.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/changelog.Debian.gz
/usr/share/doc/ruby-redis-rack/copyright
/usr/share/rubygems-integration/
/usr/share/rubygems-integration/all/
/usr/share/rubygems-integration/all/specifications/
/usr/share/rubygems-integration/all/specifications/redis-rack-2.0.2.gemspec