function add_task($task, $hosts)
{
/*{{{*/
// check task
CronTask::parseRule($task);
$matched_hosts = get_hosts($hosts);
foreach ((array) $matched_hosts as $host) {
color_echo("add task [{$task}] to {$host}\n", 'green');
if (!add_task_to_host($task, $host)) {
color_echo("add task to {$host} failed\n", "red");
}
}
return true;
}