不能在MAC OS X el capitan中更新brew，并且通过`require`不断更新Load错误
我不知道为什么会发生这种情况，但我无法更新MAC OS X El Capitan中的brew。 我做了：
brew update
并得到：
warning: unable to unlink CONTRIBUTING.md: Permission denied warning: unable to unlink SUPPORTERS.md: Permission denied fatal: cannot create directory at '.github': Permission denied
为了解决这个问题，我提到了上面的命令，但是得到了更多的问题：
sudo brew update Password: /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:55:in `require': cannot load such file -- mach (LoadError) from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:55:in `require' from /usr/local/Library/Homebrew/extend/pathname.rb:2:in `<top (required)>' from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:55:in `require' from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:55:in `require' from /usr/local/Library/Homebrew/global.rb:3:in `<top (required)>' from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:55:in `require' from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:55:in `require' from /usr/local/Library/brew.rb:16:in `<main>'
现在每当我做brew安装，我得到：
brew update /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:55:in `require': cannot load such file -- mach (LoadError) from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:55:in `require' from /usr/local/Library/Homebrew/extend/pathname.rb:2:in `<top (required)>' from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:55:in `require' from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:55:in `require' from /usr/local/Library/Homebrew/global.rb:3:in `<top (required)>' from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:55:in `require' from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:55:in `require' from /usr/local/Library/brew.rb:16:in `<main>'
事实上，似乎每当我做任何事情，就像inputbrew ，就会得到相同的信息。 有谁知道如何解决这一问题？
你不应该用自制软件sudo 。 首先运行以下命令以确保您拥有/usr/local下的所有内容：
sudo chown -R $(whoami):admin /usr/local
然后重置你的自制软件仓库到一个干净的状态：
cd /usr/local && git fetch && git reset --hard origin/master
它应该解决你的问题。
（如果你在其他地方安装了Homebrew，用/usr/local $(brew --prefix)replace/usr/local ）
