一次性

export http_proxy="http://192.168.0.188:7890"
export https_proxy="http://192.168.0.188:7890"

一直生效

写入 ~/.bashrc（或 ~/.bash_profile）

nano ~/.bashrc

 加入这一行：

export http_proxy="http://192.168.0.188:7890"
export https_proxy="http://192.168.0.188:7890"

保存后，执行一次：

source ~/.bashrc