title: how to use rvm in shell scripting
body: <p>is it possible to load rvm in shell script . can any one give an example of it.
  when i try a shell script . i am using ubuntu system</p>
  
  <pre><code>#!/bin/bash
  rvm use 1.9.3
  </code></pre>
  
  <p>it gives me error </p>
  
  <pre><code>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.
  </code></pre>