/usr/ is in ruby-rufus-scheduler 3.4.2-1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/ruby/vendor_ruby/rufus/
/usr/lib/ruby/vendor_ruby/rufus/scheduler/
/usr/lib/
/usr/lib/ruby/
/usr/lib/ruby/vendor_ruby/
/usr/lib/ruby/vendor_ruby/rufus/scheduler/cronline.rb
/usr/lib/ruby/vendor_ruby/rufus/scheduler/job_array.rb
/usr/lib/ruby/vendor_ruby/rufus/scheduler/jobs.rb
/usr/lib/ruby/vendor_ruby/rufus/scheduler/locks.rb
/usr/lib/ruby/vendor_ruby/rufus/scheduler/util.rb
/usr/lib/ruby/vendor_ruby/rufus/scheduler.rb
/usr/lib/ruby/vendor_ruby/rufus-scheduler.rb
/usr/share/
/usr/share/doc/
/usr/share/doc/ruby-rufus-scheduler/
/usr/share/doc/ruby-rufus-scheduler/README.md.gz
/usr/share/doc/ruby-rufus-scheduler/changelog.Debian.gz
/usr/share/doc/ruby-rufus-scheduler/copyright
/usr/share/rubygems-integration/
/usr/share/rubygems-integration/all/
/usr/share/rubygems-integration/all/specifications/
/usr/share/rubygems-integration/all/specifications/rufus-scheduler-3.4.2.gemspec