程序的功能是根据终端号杀死进程并激活终端，操作上只要在另一台终端上执行 killtty ttyname即可，其中ttyname 是需要激活的终端号-procedures function is based on the terminal, killing process and activation terminals, as long as the operation in another terminal can be implemented killtty ttyname, ttyname

eval( this ) in anonymous code called as a function should return that function s activation object.