note 71421 added to function.system

Mi code is: <?php echo '<pre>'; // Muestra el resultado completo del comando "cat prueba.txt", y devuelve la // ultima linea de la salida en $ultima_linea. Almacena el valor de // retorno del comando en $retval. $ultima_linea = system('cat prueba.txt', $retval); // Imprimir informacion adicional echo ' </pre> <hr />Ultima linea de la salida: ' . $ultima_linea . ' <hr />Valor de retorno: ' . $retval; ?> The problem consists thar de $retval return me 1 and don't execute nothing. I checked the permissions and all are be right. I don't know why doesn't works. ---- Server IP: 200.59.45.3 Probable Submitter: 80.33.31.51 ---- Manual Page -- http://www.php.net/manual/en/function.system.php Edit -- https://master.php.net/note/edit/71421 Del: integrated -- https://master.php.net/note/delete/71421/integrated Del: useless -- https://master.php.net/note/delete/71421/useless Del: bad code -- https://master.php.net/note/delete/71421/bad+code Del: spam -- https://master.php.net/note/delete/71421/spam Del: non-english -- https://master.php.net/note/delete/71421/non-english Del: in docs -- https://master.php.net/note/delete/71421/in+docs Del: other reasons-- https://master.php.net/note/delete/71421 Reject -- https://master.php.net/note/reject/71421 Search -- https://master.php.net/manage/user-notes.php