LAN ip detection survival status

#!/bin/bash
for i in `seq 1 250`
do
  ping -c 1 192.168.146.$i > /dev/null
  if [ $? -eq 0 ];then
    echo "192.168.146.$i存活"
  else
    echo "192.168.146.$i不存活" >> /root/ip.log
  fi
done