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 use of additional difficulties, but in any case we have to look at Its source code now!