yii框架如何通过控制台命令创建定时任务

<?php
$yii = '/home/apps/framework/yii.php';
require_once($yii);
$configFile = dirname(__FILE__).'/../config/console.php';
Yii::createConsoleApplication($configFile)->run();

<?php 
return array(
    'basePath'=>dirname(__FILE__).DIRECTORY_SEPARATOR.'..',
    'name'=>'Emergency',
    'import'=>array( 
            'application.models.*',
            'application.components.*',
            'application.extensions.*',
    ),
    'components'=>array(
        'log'=>array(
            'class'=>'CLogRouter',
            'routes'=>array(
                array(
                    'class'=>'CFileLogRoute',
                    'levels'=>'info, warning, error',
                ),
            ),
        ),
        'db'=>array(
            'class'=>'application.extensions.PHPPDO.CPdoDbConnection',
            'pdoClass' => 'PHPPDO',
            'connectionString' => 'mysql:host=xxxx;dbname=xxx',
            'emulatePrepare' => true,
            'username' => 'xxx',
            'password' => 'xxx',
            'charset' => 'utf8',
            'tablePrefix' => 'tbl_',
        ),
    ), 

    'params' => require('params.php'),
);

<?php 
class TestCommand  extends CConsoleCommand 
{ 
    public function run()
    { 
        ...
    } 
}