/usr/ is in ruby-childprocess 0.3.9-2.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/ruby/
/usr/share/
/usr/share/rubygems-integration/
/usr/share/rubygems-integration/1.9.1/
/usr/share/rubygems-integration/1.9.1/specifications/
/usr/share/rubygems-integration/1.9.1/specifications/childprocess-0.3.9.gemspec
/usr/share/rubygems-integration/1.8/
/usr/share/rubygems-integration/1.8/specifications/
/usr/share/rubygems-integration/1.8/specifications/childprocess-0.3.9.gemspec
/usr/share/lintian/
/usr/share/lintian/overrides/
/usr/share/lintian/overrides/ruby-childprocess
/usr/share/doc/
/usr/share/doc/ruby-childprocess/
/usr/share/doc/ruby-childprocess/copyright
/usr/share/doc/ruby-childprocess/README.md
/usr/share/doc/ruby-childprocess/changelog.Debian.gz
/usr/lib/
/usr/lib/ruby/vendor_ruby/
/usr/lib/ruby/vendor_ruby/childprocess.rb
/usr/lib/ruby/vendor_ruby/childprocess/
/usr/lib/ruby/vendor_ruby/childprocess/jruby.rb
/usr/lib/ruby/vendor_ruby/childprocess/errors.rb
/usr/lib/ruby/vendor_ruby/childprocess/version.rb
/usr/lib/ruby/vendor_ruby/childprocess/windows.rb
/usr/lib/ruby/vendor_ruby/childprocess/jruby/
/usr/lib/ruby/vendor_ruby/childprocess/jruby/process.rb
/usr/lib/ruby/vendor_ruby/childprocess/jruby/pump.rb
/usr/lib/ruby/vendor_ruby/childprocess/jruby/io.rb
/usr/lib/ruby/vendor_ruby/childprocess/tools/
/usr/lib/ruby/vendor_ruby/childprocess/tools/generator.rb
/usr/lib/ruby/vendor_ruby/childprocess/unix/
/usr/lib/ruby/vendor_ruby/childprocess/unix/fork_exec_process.rb
/usr/lib/ruby/vendor_ruby/childprocess/unix/process.rb
/usr/lib/ruby/vendor_ruby/childprocess/unix/lib.rb
/usr/lib/ruby/vendor_ruby/childprocess/unix/platform/
/usr/lib/ruby/vendor_ruby/childprocess/unix/platform/x86_64-linux.rb
/usr/lib/ruby/vendor_ruby/childprocess/unix/platform/x86_64-macosx.rb
/usr/lib/ruby/vendor_ruby/childprocess/unix/platform/i386-solaris.rb
/usr/lib/ruby/vendor_ruby/childprocess/unix/platform/i386-linux.rb
/usr/lib/ruby/vendor_ruby/childprocess/unix/posix_spawn_process.rb
/usr/lib/ruby/vendor_ruby/childprocess/unix/io.rb
/usr/lib/ruby/vendor_ruby/childprocess/windows/
/usr/lib/ruby/vendor_ruby/childprocess/windows/process.rb
/usr/lib/ruby/vendor_ruby/childprocess/windows/lib.rb
/usr/lib/ruby/vendor_ruby/childprocess/windows/structs.rb
/usr/lib/ruby/vendor_ruby/childprocess/windows/process_builder.rb
/usr/lib/ruby/vendor_ruby/childprocess/windows/io.rb
/usr/lib/ruby/vendor_ruby/childprocess/windows/handle.rb
/usr/lib/ruby/vendor_ruby/childprocess/abstract_io.rb
/usr/lib/ruby/vendor_ruby/childprocess/unix.rb
/usr/lib/ruby/vendor_ruby/childprocess/abstract_process.rb