rails32.sh中:
      source ~/.bash_profile
      rvm 1.9.3@rails32

执行：  $ ./rails32.sh
输出结果：
      RVM is not a function, selecting rubies with 'rvm use ...' will not work.

You need to change your terminal emulator preferences to allow login shell.
Sometimes it is required to use `/bin/bash --login` as the command.
Please visit https://rvm.io/integration/gnome-terminal/ for a example.

rvm的环境变量初始化失败。

解决办法：   用source命令执行shell
                $ source rails32.sh














参考：http://wenku.baidu.com/view/cddffdf20242a8956bece4fb.html