title: Linux: where are environment variables stored?
body: <p>If I type into a terminal,</p>
  
  <pre><code>export DISPLAY=:0.0
  </code></pre>
  
  <p>... where is the shell storing that environment variable?</p>
  
  <p>I'm using Ubuntu 8.10. I've looked in the files ~/.profile and /etc/profile and can find no trace of DISPLAY.</p>