关于Homebrew的一些错误总结

今天使用Homebrew时出现了一些错误，解决之后就记录了下来：

1.Brew update failed

描述：

Error: Failed while executing git pull

解决办法：卸载Homebrew，重新安装。

卸载：

ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/uninstall)"

安装：

ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"

2.安装Homebrew，出现一下错误：

It appears Homebrew is already installed. If your intent is to reinstall you
should do the following before running this installer again:
    ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/uninstall)"

但是卸载Homebrew时，提示Failed to locate Homebrew!，但是执行$ brew update命令时，提示brew: command not found

解决办法：

先删除/usr/local下的.git与Cellar文件夹，然后安装Homebrew即可。