我这边是写了一个定时脚本去获取 ip
```
#!/bin/sh

ipaddrnew=`curl ip.sb`
ipaddrold=`cat /tmp/addr.txt`
current=$(date "+%H:%M:%S")
echo $current
echo "ipaddrnew:$ipaddrnew"
echo "ipaddrold:$ipaddrold"
if [ -n "$ipaddrnew" ] && [ "$ipaddrnew" != "$ipaddrold" ];then
echo $ipaddrnew > /tmp/addr.txt
text="ip 变动通知:${ipaddrnew}"
else
echo "没有变化"
fi
```