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Linux基于用户账号的访问控制机制：账户类型：用户账户，系统账户。识别方式：UID、GID 用户账号：超级用户：root、系统用户、普通用户。组账号：用户区分权限，不用于登录。基本组（私有组）、附加组（公有组）。 UID： root：0 系统用户：1-499 普通用户：500-60000 ...

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