for实例1

#!/bin/bash

for n in {100...200};do

        host=192.168.4.$n

        ping -c2 $host &>/dev/null

        if [$?=0];then

                   echo "$host is UP"

                    echo "$host">>/root/alive.txt

        else

                     echo "$host is down"

        fi

done

转载于:https://blog.51cto.com/liuniansishuixi/1079542