brew 설치 오류 https://stackoverflow.com/questions/69826334/homebrew-no-available-formula-or-cask-fatal-needed-a-single-revision
zsh 설치방법 https://blog.dnd.ac/settings-mac-terminal/
brew update 방법 brew update --auto-update
brew update --auto-update
느려지는 이유로 삭제 https://designdepot.tistory.com/212
추가 참고 사이트 https://ooeunz.tistory.com/21 https://velog.io/@saemsol/Oh-My-Zsh
https://miracleground.tistory.com/entry/Mac%EC%97%90%EC%84%9C-Homebrew-%EC%84%A4%EC%B9%98-%ED%9B%84-zsh-command-not-found-brew-%EC%98%A4%EB%A5%98%ED%95%B4%EA%B2%B0