echo "局域网内主机："
duan=`ifconfig|grep 255|awk '{print $2}'|awk -F. '{print $3}'`
echo $duan
for (( i = 1; i < 255; i++ )); do
{
	nc -zw2 192.168.$duan.$i 22
	if [ $? -eq 0 ]; then
		echo "find host:${lan_ip}$i"
	fi
} &
done