brew 安裝軟體比較方便，國內源下載會比較快，但是有時下載會失敗

所有有時需要切換國內與預設的源

切換國內源

# 替換brew.git:
$ cd "$(brew --repo)"
# 中國科大:
$ git remote set-url origin https://mirrors.ustc.edu.cn/brew.git
# 清華大學:
$ git remote set-url origin https://mirrors.tuna.tsinghua.edu.cn/git/homebrew/brew.git

# 替換homebrew-core.git:
$ cd "$(brew --repo)/Library/Taps/homebrew/homebrew-core
 
"
# 中國科大:
$ git remote set-url origin https://mirrors.ustc.edu.cn/homebrew-core.git
# 清華大學:
$ git remote set-url origin https://mirrors.tuna.tsinghua.edu.cn/git/homebrew/homebrew-core.git

# 替換homebrew-bottles:
# 中國科大:
$ echo 'export HOMEBREW_BOTTLE_DOMAIN=https://mirrors.ustc.edu.cn/homebrew-bottles' >> ~/.bash_profile
$ source 
 
~/.bash_profile
# 清華大學:
$ echo 'export HOMEBREW_BOTTLE_DOMAIN=https://mirrors.tuna.tsinghua.edu.cn/homebrew-bottles' >> ~/.bash_profile
$ source ~/.bash_profile

# 應用生效:
$ brew update

切換到官方預設

# 重置brew.git:
$ cd "$(brew --repo)"
$ git remote set-url origin https://github.com/Homebrew/brew.git

# 重置homebrew
 
-core.git:
$ cd "$(brew --repo)/Library/Taps/homebrew/homebrew-core"
$ git remote set-url origin https://github.com/Homebrew/homebrew-core.git