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On Linux, make a php file anywhere in your filesystem while including the magento Mage file.

<?php

require_once "/home/cliper/magento/app/Mage.php";

Mage::app();

$config  = Mage::getConfig()->getResourceConnectionConfig("default_setup");

$dbinfo = array(“host” => $config->host,
                “user” => $config->username,
                “pass” => $config->password,
                “dbname” => $config->dbname
);
?>

where /home/cliper/magento/ is your magento absolute path.

In windows, change the directory like:

require_once “C:\magento\path\app\Mage.php”;

You can then use the array like:

echo $dbinfo[“host”];