Ruby file/folder shredding

shred.rb

      def cleanup(target)
        if FileTest.file?(target)
          shred(target)
        else
          Find.find(File.absolute_path(target)) do |thing|
            if FileTest.file?(thing)
              shred(thing)
            end
          end
        end
        FileUtils.remove_entry_secure target
      end

      def shred(target)
        size = File.size(target)
        7.times do
          File.open(target, 'wb') do |f|
            byte = Random.rand(0xff)
            size.times { f.print(byte.chr) }
          end
        end
      end