[macOS] brew 설치/업데이트 오류시 대처방법

brew update 또는 brew install 을 할 때에 아래와 같은 오류가 발생하는 경우가 있습니다.

Error: Cowardly refusing to 'sudo brew update'  You can use brew with sudo, but only if the brew executable is owned by root.  However, this is both not recommended and completely unsupported so do so at your own risk.

아래 명령어를 입력한 후 다시 실행하면 됩니다.

sudo chown root /usr/local/bin/brew

* 출처: http://stackoverflow.com/questions/19039404/error-cowardly-refusing-to-sudo-brew-install-for-installing-glue-0-3-for-mac