这将未经验证的用户重定向到登录屏幕，显示屏幕的用户访问被拒绝如果适用。
This will redirect unauthenticated users to the login screen and show users access denied screens if applicable.
pam_permission模块会检查是否存在选择性指定的文件，然后读取此文件来确定某个用户/组是否被赋予/拒绝访问。
The pam_permission module checks for the existence of an optionally specified file and then reads the file to determine if a user/group is granted/denied access.
被授予访问权限或由于在概要文件的访问列表中而被拒绝授予权限的用户ID和组将拥有它们已获得的访问权限，这是很明显的。
The user IDs and groups that had access granted or denied specifically because they are in the access list of the profile, would, obviously, have the access that they were granted.
如果登录成功则允许用户访问，若是登录被拒绝则显示消息指示找不到用户名和密码。
Allow the user access if the login succeeded or deny the user access and provide a message to indicate that the username and password could not be found.
比如，访问也许被设为：用户拥有某文件的读写权限，而组拥有该文件的只读权限，并且该文件拒绝这个系统上的其他用户访问。
For example, access should be set so that the user owning the file has read and write privileges, the group has read-only privileges, and other users on the system are denied access to the file.
比如，访问也许被设为：用户拥有某文件的读写权限，而组拥有该文件的只读权限，并且该文件拒绝这个系统上的其他用户访问。
For example, access should be set so that the user owning the file has read and write privileges, the group has read-only privileges, and other users on the system are denied access to the file.
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