/usr/ is in ruby-mixlib-shellout 2.2.6-1.
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/mixlib/
/usr/lib/ruby/vendor_ruby/mixlib/shellout/
/usr/lib/ruby/vendor_ruby/mixlib/shellout/exceptions.rb
/usr/lib/ruby/vendor_ruby/mixlib/shellout/unix.rb
/usr/lib/ruby/vendor_ruby/mixlib/shellout/version.rb
/usr/lib/ruby/vendor_ruby/mixlib/shellout/windows/
/usr/lib/ruby/vendor_ruby/mixlib/shellout/windows/core_ext.rb
/usr/lib/ruby/vendor_ruby/mixlib/shellout/windows.rb
/usr/lib/ruby/vendor_ruby/mixlib/shellout.rb
/usr/share/
/usr/share/doc/
/usr/share/doc/ruby-mixlib-shellout/
/usr/share/doc/ruby-mixlib-shellout/README.md
/usr/share/doc/ruby-mixlib-shellout/changelog.Debian.gz
/usr/share/doc/ruby-mixlib-shellout/copyright
/usr/share/rubygems-integration/
/usr/share/rubygems-integration/all/
/usr/share/rubygems-integration/all/specifications/
/usr/share/rubygems-integration/all/specifications/mixlib-shellout-2.2.6.gemspec