生产环境判断网段IP是否存活

#!/bin/bash
for i in  `seq 1 254`
do
        ping -c 1 192.168.237.$i > /dev/null
        if [ $? -eq 0 ]
        then
                echo "192.168.237.$i存活"
        else
                echo "192.168.237.$i不存活" >>/root/a.txt
        fi
done