Ubuntu Server 内配置代理方法

# 配置代理
export http_proxy="http://1.2.3.4:1234/"
export https_proxy="http://1.2.3.4:1234/"
export ftp_proxy="http://1.2.3.4:1234/"
export no_proxy="127.0.0.1,localhost"

# 移除代理
unset http_proxy
unset https_proxy
unset ftp_proxy
unset no_proxy