临时
export http_proxy=http://ip:port
export https_proxy=http://ip:port
永久
vim /etc/profile
http_proxy=http://127.0.0.1:9666 #代理程序地址
https_proxy=http://127.0.0.1:9666
ftp_proxy=http://127.0.0.1:9666
export http_proxy
export ftp_proxy
export https_proxy