Fix Spotlight continually re-indexing your hard drive | MacIssues http://www.macissues.com/2014/07/07/fix-spotlight-continually-re-indexing-your-hard-drive/#more-1438
How to install Xcode, Homebrew, Git, RVM, Ruby & Rails on Mac OS X (from Snow Leopard to Yosemite) – Moncef Belyamani http://www.moncefbelyamani.com/how-to-install-xcode-homebrew-git-rvm-ruby-on-mac/#step-2