test_connection.rb

class TestConnection
  def repeat_test
    while true do
      if packet_loss > 0
        `say 'link down'`
      end
    end
  end

  def packet_loss
    ping_google.split(",").last =~ /(\d+\.\d+)\%/
    $1.to_i
  end

  def ping_google
    `ping -t 5 -q google.com`
  end
end

if __FILE__ == $0
  tc = TestConnection.new
  tc.repeat_test
end