参考http://stackoverflow.com/questions/26238884/brew-versions-unkown-command-mavericks

设定以后提示

Error: The `versions` command is no longer supported.

You can use the homebrew-versions tap instead:

  https://github.com/Homebrew/homebrew-versions

 

解决方案如下

1，安装homebrew-versions

命令：sudo brew tap homebrew/versions

2，brew查看软件版本

命令：brew install homebrew/versions/mongodb

提示如下：

These similarly named formulae were found:

homebrew/versions/mongodb24              homebrew/versions/mongodb26            

To install one of them, run (for example):

  brew install homebrew/versions/mongodb24

3，安装

brew install homebrew/versions/mongodb24