mac中brew update出错：
brew update error: could not lock config file .git/config: Permission denied
搜：
brew update error could not lock config file .git/config: Permission denied
amazon ec2 – git error "could not lock config file .git/config permission denied" – Stack Overflow
lion – Homebrew permissions & multiple users needing to brew update – Ask Different
后来参考：
lion – Homebrew permissions & multiple users needing to brew update – Ask Different
去执行：
［总结］
sudo chgrp -R admin /usr/local sudo chmod -R g+w /usr/local
（不用去管/Library/Caches/Homebrew，因为找不到对应路径）
然后就可以继续正常的：
brew update
了。
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