不知道为什么没有人提到这一点:当你从官方网站运行安装命令时，在最后几行你会看到如下内容，你需要遵循==>下一步:

==> Installation successful!

==> Homebrew has enabled anonymous aggregate formulae and cask analytics.
Read the analytics documentation (and how to opt-out) here:
  https://docs.brew.sh/Analytics
No analytics data has been sent yet (or will be during this `install` run).

==> Homebrew is run entirely by unpaid volunteers. Please consider donating:
  https://github.com/Homebrew/brew#donations

==> Next steps:
- Add Homebrew to your PATH in /Users/{YOUR USER NAME}/.bash_profile:
    echo 'eval $(/opt/homebrew/bin/brew shellenv)' >> /Users/{YOUR USER NAME}/.bash_profile
    eval $(/opt/homebrew/bin/brew shellenv)

这是bash shell的。对于每个不同的shell，您将看到不同的步骤，但是这些步骤的源是相同的。

检查是否安装了Xcode:

$ gcc --version

$ ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install.sh)"

$ brew doctor

$ brew update

http://techsharehub.blogspot.com/2013/08/brew-command-not-found.html“点击这里获取准确的指令更新”

如果运行后仍然报错，

ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"

然后尝试从https://developer.apple.com/download/more/下载并安装命令行工具，适用于特定的Mac os和Xcode版本。

然后试着跑，

/usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"

然后

brew install node

下面是一个将自制程序安装程序包装在bash函数中的版本，可以从部署脚本中运行:

install_homebrew_if_not_present() {
    echo "Checking for homebrew installation"
    which -s brew
    if [[ $? != 0 ]] ; then
        echo "Homebrew not found. Installing..."
        ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
    else
        echo "Homebrew already installed! Updating..."
        brew update
    fi
}

另一个函数将安装一个自制公式，如果它还没有安装:

brew_install () {       
    if brew ls --versions $1 > /dev/null; then
        echo "already installed: $1"
    else
        echo "Installing forumula: $1..."
        brew install $1
    fi
}

一旦你定义了这些函数，你可以在你的bash脚本中像下面这样使用它们:

install_homebrew_if_not_present
brew_install wget
brew_install openssl
...

首先，在MAC终端上粘贴命令来安装自制程序

ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)" 

然后编辑你的.bashrc文件

vi .bashrc

在最后粘贴下面的命令并保存它

export PATH=/opt/homebrew/bin:$PATH

要保存，只需输入:wq并按enter

如果bashrc文件不存在，则只需创建并编辑该文件，以创建类型

touch ~/.bashrc

然后简单地运行命令

source ~/.bashrc

现在尝试使用brew命令，希望它现在可以工作了

更新:如果你使用的是M1 mac，那么在安装homebrew后，只需运行下面提到的命令并重新加载终端

echo "export PATH=/opt/homebrew/bin:$PATH" >> ~/.zshrc

不知道为什么没有人提到这一点:当你从官方网站运行安装命令时，在最后几行你会看到如下内容，你需要遵循==>下一步:

==> Installation successful!

==> Homebrew has enabled anonymous aggregate formulae and cask analytics.
Read the analytics documentation (and how to opt-out) here:
  https://docs.brew.sh/Analytics
No analytics data has been sent yet (or will be during this `install` run).

==> Homebrew is run entirely by unpaid volunteers. Please consider donating:
  https://github.com/Homebrew/brew#donations

==> Next steps:
- Add Homebrew to your PATH in /Users/{YOUR USER NAME}/.bash_profile:
    echo 'eval $(/opt/homebrew/bin/brew shellenv)' >> /Users/{YOUR USER NAME}/.bash_profile
    eval $(/opt/homebrew/bin/brew shellenv)

这是bash shell的。对于每个不同的shell，您将看到不同的步骤，但是这些步骤的源是相同的。