Ruby安装

rvmuse2.2.2 --default 可能报错：

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 an example.

解决办法：参考：http://www.cnblogs.com/fantiantian/p/3392357.html

 然后执行如下命令： 

1 /bin/bash --login

 解决此问题。