def get_rc
      res = []
      Execute.task_popen3(*@override_a, "_show") do |i, o, e, t|
        res = o.read.each_line.map { |l| l.chomp }
      end
      Taskrc.new(res, :array)
    end
def get_rc
      res = []
      Execute.task_popen3(*@override_a, "_show") do |i, o, e, t|
        res = o.read.each_line.map { |l| l.chomp }
      end
      Taskrc.new(res, :array)
    end
Calls `task _show` with initial overrides returns a Taskrc object of the
 result

 @return [Rtasklib::Taskrc]
 @api public