1、ALL_PROXY和http_proxy,https_proxy的区别与联系
2、apt设置代理
vi /etc/apt/apt.conf.d/proxy.conf
Acquire::http::Proxy "http://127.0.0.1:7890/";
Acquire::https::Proxy "http://127.0.0.1:7890/";
Acquire::http::Proxy "http://127.0.0.1:10809/";
Acquire::https::Proxy "http://127.0.0.1:10809/";
3、linux中使用export命令和使用set命令设置环境变量的区别
