How to dump a Mysql with ANT to a file?

Hello!

I manage to dump a database to a file if I from the cmd write:
mysqldump -u root -pmy_pass --database howto > howto.sql

This creates a file like below:
-- MySQL dump 10.10
--
-- Host: localhost    Database: howto
-- ------------------------------------------------------
-- Server version    5.0.15-nt

/*!40101 SET @OLD_CHARACTER_SET_CLIENT=@@CHARACTER_SET_CLIENT */;
/*!40101 SET @OLD_CHARACTER_SET_RESULTS=@@CHARACTER_SET_RESULTS */;
/*!40101 SET @OLD_COLLATION_CONNECTION=@@COLLATION_CONNECTION */;
/*!40101 SET NAMES utf8 */;
/*!40103 SET @OLD_TIME_ZONE=@@TIME_ZONE */;
/*!40103 SET TIME_ZONE='+00:00' */;
/*!40014 SET @OLD_UNIQUE_CHECKS=@@UNIQUE_CHECKS, UNIQUE_CHECKS=0 */;
/*!40014 SET @OLD_FOREIGN_KEY_CHECKS=@@FOREIGN_KEY_CHECKS, FOREIGN_KEY_CHECKS=0 */;
/*!40101 SET @OLD_SQL_MODE=@@SQL_MODE, SQL_MODE='NO_AUTO_VALUE_ON_ZERO' */;
/*!40111 SET @OLD_SQL_NOTES=@@SQL_NOTES, SQL_NOTES=0 */;

--
-- Current Database: `howto`
--

CREATE DATABASE /*!32312 IF NOT EXISTS*/ `howto` /*!40100 DEFAULT CHARACTER SET utf8 */;

USE `howto`;

--
-- Table structure for table `pages`
--

DROP TABLE IF EXISTS `pages`;
CREATE TABLE `pages` (
  `id` int(11) NOT NULL,
  `name` varchar(100) NOT NULL,
  PRIMARY KEY  (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

--
-- Dumping data for table `pages`
--


/*!40000 ALTER TABLE `pages` DISABLE KEYS */;
LOCK TABLES `pages` WRITE;
INSERT INTO `pages` VALUES (0,'Test Name');
UNLOCK TABLES;
/*!40000 ALTER TABLE `pages` ENABLE KEYS */;
/*!40103 SET TIME_ZONE=@OLD_TIME_ZONE */;

/*!40101 SET SQL_MODE=@OLD_SQL_MODE */;
/*!40014 SET FOREIGN_KEY_CHECKS=@OLD_FOREIGN_KEY_CHECKS */;
/*!40014 SET UNIQUE_CHECKS=@OLD_UNIQUE_CHECKS */;
/*!40101 SET CHARACTER_SET_CLIENT=@OLD_CHARACTER_SET_CLIENT */;
/*!40101 SET CHARACTER_SET_RESULTS=@OLD_CHARACTER_SET_RESULTS */;
/*!40101 SET COLLATION_CONNECTION=@OLD_COLLATION_CONNECTION */;
/*!40111 SET SQL_NOTES=@OLD_SQL_NOTES */;

But when I run this ANT target below:
    <target description="Export the database howto" name="export">
        <exec executable="mysqldump">
          <arg line="-u root -pmy_pass --database howto > howto.sql"/>
        </exec>
    </target>

Then all output gets written to the cmd and not to the file.

Do I miss anything?

Best regards
Fredrik