title: how to make changes in .bashrc effective in current terminal
body: <p>I have an open terminal in ubuntu lucid in which I need a new env variable set.So,I open the .bashrc file and edit it ,to add the new env variable( say PYTHONPATH)</p>
  
  <p>.bashrc</p>
  
  <pre><code>PYTHONPATH=/some/path
  export PYTHONPATH
  </code></pre>
  
  <p>But,in order to get this effective ,I need to close my terminal and open it again.Is there some command with which I can get this effect,without close/open the terminal again.</p>