Ruby Version Manager(RVM)是用于管理和切换多个版本ruby环境的命令行工具。

安装RVM

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curl -sSL https://get.rvm.io | bash -s stable --ruby

安装完成有提示:

To start using RVM you need to run `source /Users/xuguoxing/.rvm/scripts/rvm`
in all your open shell windows, in rare cases you need to reopen all shell windows.

安装Ruby 1.9.3(Octopress使用)

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rvm install 1.9.3
rvm use 1.9.3
rvm rubygems latest