说明：  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 is need to activate the terminal,)