... 非特权用户程序 nonprivileged user program 转入特权用户模式 enable 用户特权 user privilege ...
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电子邮件、远程登录和超级用户特权都需要密码，这些密码最好各不相同而且难以通过自动化攻击猜测或推断出来。
To wit, e-mail, remote login, and superuser privileges all require a password—preferably disparate and each difficult to guess or derive using an automated attack.
这使 set-user-ID（非根）程序能够放弃它的所有用户特权，执行一些非特权操作，然后恢复原来的有效用户 ID。
This allows a set-user-ID (other than root) program to drop all of its user privileges, do some un-privileged work, and then re-engage the original effective user ID in a secure manner.
PUBLIC实际上并不是外部安全设施中定义的一个组，而是一种向成功经过身份验证的用户分配特权的方式。
PUBLIC is not actually a group defined in the external security facility, but is rather a way to assign privileges to any user who successfully authenticates.
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