/usr/ is in ruby-redis-namespace 1.5.2-3.
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-namespace.rb
/usr/lib/ruby/vendor_ruby/redis/
/usr/lib/ruby/vendor_ruby/redis/namespace.rb
/usr/lib/ruby/vendor_ruby/redis/namespace/
/usr/lib/ruby/vendor_ruby/redis/namespace/version.rb
/usr/share/
/usr/share/doc/
/usr/share/doc/ruby-redis-namespace/
/usr/share/doc/ruby-redis-namespace/copyright
/usr/share/doc/ruby-redis-namespace/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-namespace-1.5.2.gemspec