我刚开始阅读MichaelHartl的RubyonRails 3教程。他建议使用Ruby的最新版本，目前为1.9.2。我的Mac是一台最初的英特尔iMac，现在运行Snow Leopard，安装了Ruby 1.8.7。
Michael建议使用Ruby版本管理器（RVM）安装最新版本的Ruby和Rails。所以我去了RVM网站，安装了RVM。。。
bash < <(curl -s https://rvm.beginrescueend.com/install/rvm)
这似乎奏效了。航站楼里突然出现一条信息，感谢我使用RVM。
按照Michael的下一个指示，即确保RVM是最新的：
rvm update --head
这导致-bash:rvm:找不到命令
一个脚注表明，我可能需要安装Subversion，所以安装了它，但当我运行rvm update--head时，仍然会收到相同的错误消息。
有什么建议吗？我真的很想超越设置，开始构建我的Rails应用程序。
rvm在安装后也给出了一条消息，说您需要在~/.bashrc（或等效代码）中添加一行：
echo [[ -s "$HOME/.rvm/scripts/rvm" ]] && source "$HOME/.rvm/scripts/rvm" >> ~/.bashrc
执行该操作，然后键入.~/。bashrc或打开一个新的终端。
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