/usr/lib/ruby/ is in ruby-commander 4.4.0-1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/ruby/vendor_ruby/
/usr/lib/ruby/vendor_ruby/commander/
/usr/lib/ruby/vendor_ruby/commander/user_interaction.rb
/usr/lib/ruby/vendor_ruby/commander/core_ext.rb
/usr/lib/ruby/vendor_ruby/commander/core_ext/
/usr/lib/ruby/vendor_ruby/commander/core_ext/object.rb
/usr/lib/ruby/vendor_ruby/commander/core_ext/array.rb
/usr/lib/ruby/vendor_ruby/commander/help_formatters.rb
/usr/lib/ruby/vendor_ruby/commander/blank.rb
/usr/lib/ruby/vendor_ruby/commander/command.rb
/usr/lib/ruby/vendor_ruby/commander/configure.rb
/usr/lib/ruby/vendor_ruby/commander/import.rb
/usr/lib/ruby/vendor_ruby/commander/version.rb
/usr/lib/ruby/vendor_ruby/commander/platform.rb
/usr/lib/ruby/vendor_ruby/commander/delegates.rb
/usr/lib/ruby/vendor_ruby/commander/runner.rb
/usr/lib/ruby/vendor_ruby/commander/help_formatters/
/usr/lib/ruby/vendor_ruby/commander/help_formatters/terminal_compact.rb
/usr/lib/ruby/vendor_ruby/commander/help_formatters/terminal_compact/
/usr/lib/ruby/vendor_ruby/commander/help_formatters/terminal_compact/help.erb
/usr/lib/ruby/vendor_ruby/commander/help_formatters/terminal_compact/command_help.erb
/usr/lib/ruby/vendor_ruby/commander/help_formatters/terminal.rb
/usr/lib/ruby/vendor_ruby/commander/help_formatters/terminal/
/usr/lib/ruby/vendor_ruby/commander/help_formatters/terminal/help.erb
/usr/lib/ruby/vendor_ruby/commander/help_formatters/terminal/command_help.erb
/usr/lib/ruby/vendor_ruby/commander/help_formatters/base.rb
/usr/lib/ruby/vendor_ruby/commander/methods.rb
/usr/lib/ruby/vendor_ruby/commander.rb