Get and print the page type of a Magento page layout.

magento-get-page-type.php

<?php
  //Identify the page type
	$pageIdentifier = Mage::app()->getFrontController()->getAction()->getFullActionName();
	echo  $pageIdentifier;
?>

<!-- Do something if on the specific page you need -->
<?php if(Mage::getBlockSingleton('page/html_header')->getIsHomePage()): ?>
  	home page
<?php elseif(Mage::app()->getRequest()->getRouteName()=='cms'): ?>
	cms page
<?php elseif($this->getRequest()->getControllerName()=='product'): ?>
	product page
<?php elseif($this->getRequest()->getControllerName()=='category'): ?>
	category page
<?php elseif(Mage::app()->getRequest()->getRouteName()=='checkout'): ?>
	checkout page
<?php elseif(Mage::app()->getRequest()->getRouteName()=='onestepcheckout'): ?>
	onestepcheckout page
<?php endif; ?>