/usr/lib/ruby/ is in ruby-sshkit 1.9.0-1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/ruby/vendor_ruby/
/usr/lib/ruby/vendor_ruby/core_ext/
/usr/lib/ruby/vendor_ruby/core_ext/array.rb
/usr/lib/ruby/vendor_ruby/core_ext/hash.rb
/usr/lib/ruby/vendor_ruby/sshkit.rb
/usr/lib/ruby/vendor_ruby/sshkit/
/usr/lib/ruby/vendor_ruby/sshkit/all.rb
/usr/lib/ruby/vendor_ruby/sshkit/backends/
/usr/lib/ruby/vendor_ruby/sshkit/backends/abstract.rb
/usr/lib/ruby/vendor_ruby/sshkit/backends/connection_pool.rb
/usr/lib/ruby/vendor_ruby/sshkit/backends/connection_pool/
/usr/lib/ruby/vendor_ruby/sshkit/backends/connection_pool/cache.rb
/usr/lib/ruby/vendor_ruby/sshkit/backends/connection_pool/nil_cache.rb
/usr/lib/ruby/vendor_ruby/sshkit/backends/local.rb
/usr/lib/ruby/vendor_ruby/sshkit/backends/netssh.rb
/usr/lib/ruby/vendor_ruby/sshkit/backends/printer.rb
/usr/lib/ruby/vendor_ruby/sshkit/backends/skipper.rb
/usr/lib/ruby/vendor_ruby/sshkit/color.rb
/usr/lib/ruby/vendor_ruby/sshkit/command.rb
/usr/lib/ruby/vendor_ruby/sshkit/command_map.rb
/usr/lib/ruby/vendor_ruby/sshkit/configuration.rb
/usr/lib/ruby/vendor_ruby/sshkit/coordinator.rb
/usr/lib/ruby/vendor_ruby/sshkit/deprecation_logger.rb
/usr/lib/ruby/vendor_ruby/sshkit/dsl.rb
/usr/lib/ruby/vendor_ruby/sshkit/exception.rb
/usr/lib/ruby/vendor_ruby/sshkit/formatters/
/usr/lib/ruby/vendor_ruby/sshkit/formatters/abstract.rb
/usr/lib/ruby/vendor_ruby/sshkit/formatters/black_hole.rb
/usr/lib/ruby/vendor_ruby/sshkit/formatters/dot.rb
/usr/lib/ruby/vendor_ruby/sshkit/formatters/pretty.rb
/usr/lib/ruby/vendor_ruby/sshkit/formatters/simple_text.rb
/usr/lib/ruby/vendor_ruby/sshkit/host.rb
/usr/lib/ruby/vendor_ruby/sshkit/log_message.rb
/usr/lib/ruby/vendor_ruby/sshkit/logger.rb
/usr/lib/ruby/vendor_ruby/sshkit/mapping_interaction_handler.rb
/usr/lib/ruby/vendor_ruby/sshkit/runners/
/usr/lib/ruby/vendor_ruby/sshkit/runners/abstract.rb
/usr/lib/ruby/vendor_ruby/sshkit/runners/group.rb
/usr/lib/ruby/vendor_ruby/sshkit/runners/null.rb
/usr/lib/ruby/vendor_ruby/sshkit/runners/parallel.rb
/usr/lib/ruby/vendor_ruby/sshkit/runners/sequential.rb
/usr/lib/ruby/vendor_ruby/sshkit/version.rb