ping local area network

#!/bin/bash
for i in `seq 1 254`
do
    ping -c 1 192.168.192.$i > /dev/null
    if  [ $? -eq 0 ];then
        echo "ping 192.168.192.$i成功"
    else
        echo "ping 192.168.192.$i失败" >> /root/a.txt
    fi
done