# File cli/ruby-debug/helper.rb, line 34
    def get_onoff(arg, default=nil, print_error=true)
      if arg.nil? or arg == ''
        if default.nil?
          if print_error
            print "Expecting 'on', 1, 'off', or 0. Got nothing.\n"
            raise RuntimeError
          end
          return default
        end
      end
      case arg.downcase
      when '1', 'on'
        return true
      when '0', 'off'
        return false
      else
        if print_error
          print "Expecting 'on', 1, 'off', or 0. Got: %s.\n" % arg.to_s
          raise RuntimeError
        end
      end
    end