用终端 brew update 或 brew install ** 时遇到的问题，详细如下：

Error: Could not link:

/usr/local/etc/bash_completion.d/brew

Please delete these paths and run `brew update`.

Error: Could not link:

/usr/local/share/zsh/site-functions/_brew

Please delete these paths and run `brew update`.

Error: Could not link:

/usr/local/share/man/man1/brew.1

Please delete these paths and run `brew update`.

Error: Could not link:

/usr/local/share/doc/homebrew

Please delete these paths and run `brew update`.

Error: You must `brew link autoconf makedepend` before pyenv can be installed

如图所示：

解决办法是有几处路径Error 就全部rm -rf，如下

 $ rm -rf /usr/local/share/doc/homebrew

 $ rm -rf /usr/local/share/man/man1/brew-cask.1

 $ rm -rf /usr/local/share/man/man1/brew.1

 $ rm -rf /usr/local/share/zsh/site-functions/_brew

 $ rm -rf /usr/local/etc/bash_completion.d/brew

 $ brew update

PS: 其实提示中也把解决方法说了出来，即删除相应的目录，然后再运行 brew update

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