/usr/ is in ruby-raindrops 0.12.0-2.
This file is owned by root:root, with mode 0o755.
..
/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/2.0.0/
/usr/lib/x86_64-linux-gnu/ruby/vendor_ruby/2.0.0/raindrops_ext.so
/usr/lib/ruby/
/usr/lib/ruby/vendor_ruby/
/usr/lib/ruby/vendor_ruby/1.9.1/
/usr/lib/ruby/vendor_ruby/1.9.1/x86_64-linux/
/usr/lib/ruby/vendor_ruby/1.9.1/x86_64-linux/raindrops_ext.so
/usr/lib/ruby/vendor_ruby/raindrops.rb
/usr/lib/ruby/vendor_ruby/raindrops/
/usr/lib/ruby/vendor_ruby/raindrops/watcher.rb
/usr/lib/ruby/vendor_ruby/raindrops/aggregate.rb
/usr/lib/ruby/vendor_ruby/raindrops/last_data_recv.rb
/usr/lib/ruby/vendor_ruby/raindrops/middleware/
/usr/lib/ruby/vendor_ruby/raindrops/middleware/proxy.rb
/usr/lib/ruby/vendor_ruby/raindrops/linux.rb
/usr/lib/ruby/vendor_ruby/raindrops/aggregate/
/usr/lib/ruby/vendor_ruby/raindrops/aggregate/last_data_recv.rb
/usr/lib/ruby/vendor_ruby/raindrops/aggregate/pmq.rb
/usr/lib/ruby/vendor_ruby/raindrops/middleware.rb
/usr/lib/ruby/vendor_ruby/raindrops/struct.rb
/usr/share/
/usr/share/doc/
/usr/share/doc/ruby-raindrops/
/usr/share/doc/ruby-raindrops/changelog.Debian.gz
/usr/share/doc/ruby-raindrops/copyright
/usr/share/doc/ruby-raindrops/NEWS.gz
/usr/share/doc/ruby-raindrops/README
/usr/share/doc/ruby-raindrops/LATEST
/usr/share/doc/ruby-raindrops/examples/
/usr/share/doc/ruby-raindrops/examples/middleware.ru
/usr/share/doc/ruby-raindrops/examples/zbatery.conf.rb
/usr/share/doc/ruby-raindrops/examples/linux-listener-stats.rb
/usr/share/doc/ruby-raindrops/examples/watcher_demo.ru
/usr/share/doc/ruby-raindrops/examples/watcher.ru
/usr/share/doc/ruby-raindrops/TODO
/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/raindrops-0.12.0.gemspec
/usr/share/rubygems-integration/2.0/
/usr/share/rubygems-integration/2.0/specifications/
/usr/share/rubygems-integration/2.0/specifications/raindrops-0.12.0.gemspec