樹莓派不重開機改IP
https://home.gamer.com.tw/creationDetail.php?sn=4210419
$ sudo nano /etc/dhcpcd.conf
$ sudo nano /etc/resolv.conf
$ sudo /etc/init.d/networking restart
$ sudo service networking restart
$ sudo service networking reload
$ sudo ifconfig eth0 down
$ sudo ifconfig eth0 up