def del
      if current_dir.path != '/'
        dir_was = times == 1 ? current_dir.name : File.basename(current_dir.join(['..'] * (times - 1)))
        cd File.expand_path(current_dir.join(['..'] * times))
        find dir_was
      end
    end
def del
      if current_dir.path != '/'
        dir_was = times == 1 ? current_dir.name : File.basename(current_dir.join(['..'] * (times - 1)))
        cd File.expand_path(current_dir.join(['..'] * times))
        find dir_was
      end
    end
cd to the upper hierarchy.