/usr/ is in ruby-mtrc 0.0.4-1.
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/mtrc.rb
/usr/lib/ruby/vendor_ruby/mtrc/
/usr/lib/ruby/vendor_ruby/mtrc/samples.rb
/usr/lib/ruby/vendor_ruby/mtrc/version.rb
/usr/lib/ruby/vendor_ruby/mtrc/rate.rb
/usr/lib/ruby/vendor_ruby/mtrc/sorted_samples.rb
/usr/lib/ruby/vendor_ruby/mtrc/sample.rb
/usr/share/
/usr/share/doc/
/usr/share/doc/ruby-mtrc/
/usr/share/doc/ruby-mtrc/copyright
/usr/share/doc/ruby-mtrc/changelog.Debian.gz
/usr/share/doc/ruby-mtrc/README.markdown
/usr/share/rubygems-integration/
/usr/share/rubygems-integration/all/
/usr/share/rubygems-integration/all/specifications/
/usr/share/rubygems-integration/all/specifications/mtrc-0.0.4.gemspec