brew update

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错误

/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:15:in `<main>'

原因

El Capitan’s new SIP process

先解决权限

$ sudo chown -R $(whoami):admin /usr/local

再重置homebrew目录，再更新

1. open terminal2. $ cd /usr/local3. $ git reset --hard4. $ git clean -df5. $ brew update

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