文档：The Missing Package Manager for macOS (or Linux) — Homebrew
1.简介
Homebrew 安装了Apple（或 Linux 系统）不需要的东西。
Homebrew 将软件包安装到自己的目录，然后将文件符号链接到/usr/local
Homebrew 不会在其目录之外安装文件，可以将 Homebrew 安装放置喜欢的任何位置。
2.安装
需要在命令行执行脚本来安装，安装完必须执行 Next Steps，否则找不到命令
% /bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"
==> Checking for `sudo` access (which may request your password)...
Password:
==> This script will install:
/opt/homebrew/bin/brew
/opt/homebrew/share/doc/homebrew
/opt/homebrew/share/man/man1/brew.1
/opt/homebrew/share/zsh/site-functions/_brew
/opt/homebrew/etc/bash_completion.d/brew
/opt/homebrew
Press RETURN/ENTER to continue or any