% brew doctor Please note that these warnings are just used to help the Homebrew maintainers with debugging if you file an issue. If everything you use Homebrew for is working fine: please don't worry and just ignore them. Thanks! Warning: You have external commands with conflicting names. Found command `brew-cask` in following places: /usr/local/bin/brew-cask /usr/local/Library/Taps/caskroom/homebrew-cask/cmd/brew-cask.rb % brew uninstall --force brew-cask Uninstalling brew-cask... (2,976 files, 1.5M) % brew update Already up-to-date.