实现如何在cocoa中运行shell指令。并获取shell的返回信息。最终显示在NStextView中-a Sample code about how to running shell command in cocoa, and get info from the shell return value. finally show them in a NSTextView.

在ios6.1上编写了一个简单的界面，执行shell命令。可以逐行显示ping命令的结果，也可通过按键结束ping命令的执行。也可以终结正在执行的命令，并立即执行新的命令。-This project offers a simple window interface to execute shell commands in ios6.1 with ARC. This program can display the result of shell command ping by row.You