Mac上面不能安裝Homebrew

這個stackoverflow的答案解決了個人問題：

http://stackoverflow.com/questions/18039029/mac-can-t-install-homebrew

問題以下：

it appears Homebrew is already installed. If your intent is to reinstall you
should do the following before running this installer again:
rm -rf /usr/local/Cellar /usr/local/.git && brew cleanup

解決方案：

rm -rf /usr/local/Cellar /usr/local/.git
ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"