You can refer to a valid nis netgroup or unix group by appending an " @ " to the group name . valid users example to allow drobbins and the members of the wheel group access to the shares 虽然我最先是用expect编写dom 2监视程序，但随后的实例将使用python来编写，这只是为了强调其中的这些观念适用于很多不同的语言。
