official site：https://brew.sh
install Homebrew
/usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
Paste that in a macOS Terminal prompt. 上面这行复制到terminal，之后会让你输入Mac的密码，然后等待。
==> Installation successful!
成功！
输入 brew help获取基础知识:
Example usage:
brew search [TEXT|/REGEX/]
brew info [FORMULA...]
brew install FORMULA...
brew update
brew upgrade [FORMULA...]
brew uninstall FORMULA...
brew list [FORMULA...]
Troubleshooting:
brew config
brew doctor
brew install --verbose --debug FORMULA
Contributing:
brew create [URL [--no-fetch]]
brew edit [FORMULA...]
Further help:
brew commands
brew help [COMMAND]
man brew
https://docs.brew.sh
输入brew command，看有哪些命令:
Built-in commands
--cache commands install readall uninstall
--cellar config leaves reinstall unlink
--env deps link search unpack
--prefix desc list sh unpin
--repository diy log shellenv untap
--version doctor migrate style update
analytics fetch missing switch update-report
cask gist-logs options tap update-reset
cat help outdated tap-info upgrade
cleanup home pin tap-pin uses
command info postinstall tap-unpin vendor-install
Built-in developer commands
audit extract mirror tap-new
bottle formula prof test
bump-formula-pr irb pull tests
create linkage release-notes update-test
edit man ruby vendor-gems
External commands
aspell-dictionaries postgresql-upgrade-database