/usr/ is in ruby-file-tail 1.0.12-1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/ruby/vendor_ruby/file/tail/tailer.rb
/usr/lib/
/usr/lib/ruby/
/usr/lib/ruby/vendor_ruby/
/usr/lib/ruby/vendor_ruby/file-tail.rb
/usr/lib/ruby/vendor_ruby/file/
/usr/lib/ruby/vendor_ruby/file/tail.rb
/usr/lib/ruby/vendor_ruby/file/tail/
/usr/lib/ruby/vendor_ruby/file/tail/group.rb
/usr/lib/ruby/vendor_ruby/file/tail/logfile.rb
/usr/lib/ruby/vendor_ruby/file/tail/version.rb
/usr/lib/ruby/vendor_ruby/file/tail/line_extension.rb
/usr/share/
/usr/share/rubygems-integration/
/usr/share/rubygems-integration/1.8/
/usr/share/rubygems-integration/1.8/specifications/
/usr/share/rubygems-integration/1.8/specifications/file-tail-1.0.12.gemspec
/usr/share/rubygems-integration/1.9.1/
/usr/share/rubygems-integration/1.9.1/specifications/
/usr/share/rubygems-integration/1.9.1/specifications/file-tail-1.0.12.gemspec
/usr/share/doc/
/usr/share/doc/ruby-file-tail/
/usr/share/doc/ruby-file-tail/copyright
/usr/share/doc/ruby-file-tail/examples/
/usr/share/doc/ruby-file-tail/examples/tail.rb
/usr/share/doc/ruby-file-tail/examples/pager.rb
/usr/share/doc/ruby-file-tail/examples/rtail
/usr/share/doc/ruby-file-tail/changelog.Debian.gz
/usr/share/doc/ruby-file-tail/README.rdoc