ping命令看似小小的一个工具，但它带有许多参数，要完全掌握它的使用方法还真不容易，要达到熟练使用则更是难下加难，但不管怎样我们还得来看看它的源程序吧！-a tool may seem a little ping command, but it comes with a number of parameters, to fully grasp its really not easy to use, to achieve even more difficult under the skilled