/usr/ is in ruby-daemons 1.1.9-2.
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/daemons/
/usr/lib/ruby/vendor_ruby/daemons/pid.rb
/usr/lib/ruby/vendor_ruby/daemons/pidmem.rb
/usr/lib/ruby/vendor_ruby/daemons/etc_extension.rb
/usr/lib/ruby/vendor_ruby/daemons/cmdline.rb
/usr/lib/ruby/vendor_ruby/daemons/change_privilege.rb
/usr/lib/ruby/vendor_ruby/daemons/daemonize.rb
/usr/lib/ruby/vendor_ruby/daemons/pidfile.rb
/usr/lib/ruby/vendor_ruby/daemons/exceptions.rb
/usr/lib/ruby/vendor_ruby/daemons/monitor.rb
/usr/lib/ruby/vendor_ruby/daemons/controller.rb
/usr/lib/ruby/vendor_ruby/daemons/application.rb
/usr/lib/ruby/vendor_ruby/daemons/application_group.rb
/usr/lib/ruby/vendor_ruby/daemons.rb
/usr/share/
/usr/share/rubygems-integration/
/usr/share/rubygems-integration/all/
/usr/share/rubygems-integration/all/specifications/
/usr/share/rubygems-integration/all/specifications/daemons-1.1.9.gemspec
/usr/share/doc/
/usr/share/doc/ruby-daemons/
/usr/share/doc/ruby-daemons/README.gz
/usr/share/doc/ruby-daemons/changelog.Debian.gz
/usr/share/doc/ruby-daemons/examples/
/usr/share/doc/ruby-daemons/examples/run/
/usr/share/doc/ruby-daemons/examples/run/ctrl_multiple.rb
/usr/share/doc/ruby-daemons/examples/run/ctrl_optionparser.rb
/usr/share/doc/ruby-daemons/examples/run/ctrl_normal.rb
/usr/share/doc/ruby-daemons/examples/run/ctrl_proc_rand.rb
/usr/share/doc/ruby-daemons/examples/run/ctrl_crash.rb
/usr/share/doc/ruby-daemons/examples/run/ctrl_proc_multiple.rb
/usr/share/doc/ruby-daemons/examples/run/ctrl_slowstop.rb
/usr/share/doc/ruby-daemons/examples/run/ctrl_keep_pid_files.rb
/usr/share/doc/ruby-daemons/examples/run/myserver_slowstop.rb
/usr/share/doc/ruby-daemons/examples/run/ctrl_exit.rb
/usr/share/doc/ruby-daemons/examples/run/myserver_hanging.rb
/usr/share/doc/ruby-daemons/examples/run/ctrl_proc.rb
/usr/share/doc/ruby-daemons/examples/run/ctrl_proc_simple.rb
/usr/share/doc/ruby-daemons/examples/run/ctrl_ontop.rb
/usr/share/doc/ruby-daemons/examples/run/ctrl_exec.rb
/usr/share/doc/ruby-daemons/examples/run/myserver.rb
/usr/share/doc/ruby-daemons/examples/run/ctrl_monitor.rb
/usr/share/doc/ruby-daemons/examples/run/ctrl_hanging.rb
/usr/share/doc/ruby-daemons/examples/run/myserver_exiting.rb
/usr/share/doc/ruby-daemons/examples/run/myserver_crashing.rb
/usr/share/doc/ruby-daemons/examples/call/
/usr/share/doc/ruby-daemons/examples/call/call.rb
/usr/share/doc/ruby-daemons/examples/call/call_monitor.rb
/usr/share/doc/ruby-daemons/examples/daemonize/
/usr/share/doc/ruby-daemons/examples/daemonize/daemonize.rb
/usr/share/doc/ruby-daemons/copyright