brew update失败提示：/System/Library/Frameworks/Ruby.framework/的解决方法

本文转载自查看原文 2017-12-15 00:23 1038 杂记

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文章链接：http://www.cnblogs.com/wolfray/p/8040701.html

想用brew安装wget，但是提示失败，然后想先 brew update，然后再重新试一下，结果在brew update后出现了这个情况：

$ 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>'

不管执行什么brew命令提示依旧，这种情况多发生在 El Capitan系统上，原因大概是更新失败，下面是stackoverflow找到的答案，亲测有效：

The problem mainly occurs after updating OS X to El Capitan (OS X 10.11). This is mainly because of file permission issues with file El Capitan’s new SIP process. Try changing permissions of/usr/local directory.

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

如果运行完上面的命令还没有起作用的话，那么再运行下面的命令应该就可以了。这可能是因为homebrew还没有升级的原因。

1. 首先打开终端
2. $ cd /usr/local  
3. $ git reset --hard  
4. $ git clean -df
5. $ brew update

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