Adds URL to pages window

add_filter('manage_page_posts_columns', 'my_custom_column', 10);

add_action('manage_page_posts_custom_column', 'add_my_custom_column', 10, 2);

function my_custom_column($defaults) {

  $defaults['url'] = 'URL';

  return $defaults;

}

function add_my_custom_column($column_name, $post_id) {

  if ($column_name == 'url') {

      $siteURL=get_site_url($post_id);

      $link= get_permalink( $post_id );

      echo str_replace($siteURL,"",$link);

   }

}