简单脚本编写（仅仅if与for）

1.仅仅if与for     //for循环是某范围内的循环

#!/bin/bash
for ip in `cat ip.txt`
do
ping -c 3 -i 0.2 -w3 $ip
if [ $? -eq 0 ]
then
echo "haha $ip is life"
else
echo "haha $ ip is no life"
fi
done

2.if 与while