13-测试活跃的主机-while版本

#!/bin/bash
#Author:Willem

i=1
while [ $i -le 254 ] 
do
        ping -c 2 -i 0.3 -W 1 192.168.1.$i &>/dev/null
        if [ $? -eq 0 ];then
                echo "192.168.1.$i is up"
        else
                echo "192.168.1.$i is down"
        fi
        let i++
done