title: RVM finding system gems' executables
body: <p>I have installed RVM along with ruby versions. However if I fire up the console and run the command rails server, bundle install, etc. I get this error</p>
  
  <pre><code>bash: /usr/bin/rails: /usr/bin/ruby1.8: bad interpreter: No such file or directory
  </code></pre>
  
  <p>But if I run <code>rvm use 1.9.2</code> first, then everything is ok. I tried using `rvm use --default 1.9.2' but nothing changed. Does this mean it uses a different ruby from the ones in RVM? Thanks in advance!</p>