mac 更新brew镜像源
cd "$(brew --repo)/Library/Taps/homebrew/homebrew-core" git remote set-url origin git://mirrors.ustc.edu.cn/homebrew-core.git echo ‘export HOMEBREW_BOTTLE_DOMAIN=https://mirrors.ustc.edu.cn/homebrew-bottles‘ >> ~/.bash_profile source ~/.bash_profile brew update
原文：http://www.cnblogs.com/jackylee92/p/6619143.html