$ brew update warning: unable to unlink CONTRIBUTING.md: Permission denied warning: unable to unlink SUPPORTERS.md: Permission denied fatal: cannot create directory at '.github': Permission denied Error: Failure while executing: git pull -q origin refs/heads/master:refs/remotes/origin/master $ sudo brew update /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/core_
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