# File lib/rfilter/delivery_agent.rb, line 156
    def pipe(command, continue = false)
      log(2, "Action: pipe to #{command.inspect}")
      deliver_pipe(command, @message)
      if $? != 0
        m = "pipe failed for command #{command.inspect}"
        log(1, "Error: " + m)
        raise DeliveryCommandFailure.new(m, $?)
      end
      unless continue
        raise DeliverySuccess.new("pipe to #{command.inspect}")
      end
    end