Magento version Check can be done from the back end using the file app/Mage.php of your Magento installation, simply search for getVersionInfo() function there:
public static function
{
return array(
'major' => '1',
'minor' => '6',
'revision' => '1',
'patch' => '0',
'stability' => '', '
number' => '',
); }
The version is 1.6.1.0
You can list all magento versions on a server:
find /home/*/public_html/ -type f -name Mage.php -exec grep -A 3 "'major' =>;" {} \; -print
