/usr/share/php/PicoFeed/Rules/cad-comic.com.php is in php-picofeed 0.1.18-1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13  | <?php
return array(
    'grabber' => array(
        '%/cad/.+%' => array(
            'test_url' => 'http://www.cad-comic.com/cad/20150417',
            'body' => array(
                '//*[@id="content"]/img',
            ),
            'strip' => array(),
        ),
    ),
);
 |