"ERROR 1044 (42000) at line 39: Access denied for user 'drupal_user'@'localhost' to database 'mydb'"

$local_sites = '/Users/steve/Sites/';
$aliases['local'] = array(
  'uri' => 'default',
  'root' => $local_sites . 'mysite/public_html',
  'path-aliases' => array(
    '%files' => $local_sites . 'mysite/public_html/sites/default/files',
    '%dump-dir' => '/Users/steve/Sites/mysite',
   ),
);

$aliases['prod'] = array(
  'uri' => 'default',
  'os' => 'Linux',
  'root' => '/cluster/www_system/www/www.mysite.org/current_build/public_html',
  'remote-host' => 'control.cphwf01.local',
  'remote-user' => 'sedwards',
  'path-aliases' => array(
    '%files' => 'sites/default/files',
    '%dump-dir' => '/scratch',
   ),
);

Calling system(mysql --database=mydb --host=localhost --user=drupal_user --password=mypass --silent < /Users/steve/Sites/mysite/mysiteLeW4G5);

mysql --database=mydb --host=localhost --user=drupal_user --password=mypass