ping某网段是否连通脚本（案例）

#!/bin/bash
for i in {1..254}
do
ping -c2 -i0.3 -W1 192.168.4.$i &>/dev/null
if [ $? -eq 0 ];then
echo "192.168.4.$i is up"
else
echo "192.168.4.$i is down"
fi
done