BY following these few commands -
1. Login in SSH
2. cd public_html/<your directory>
3. php -a
4. include 'app/Mage.php';
5. include 'app/Mage.php';

<?php
    include_once 'app/Mage.php';
    umask(0);
    Mage::app("default");
    echo Mage::getVersion();
  ?>