The system sets permissions for all the files in an application so that only the user ID assigned to that application can access them.
应用中的所有文件访问许可都被系统设置了此ID，因此，只有被分配了该用户ID的应用可以访问这些文件。
This component is a repository for persisting user account information such as user id and password, permissions, and roles for providing authentication and authorization of Web resources.
该组件是一个储存库，用于持久化用户账户信息，如用户ID和密码、许可和角色，以便提供Web资源的认证和授权。
The Linux permissions model has two special access modes called suid (set user id) and sgid (set group id).
Linux权限模型有两个特殊的访问模式，名为suid(设置用户id)和sgid(设置组id)。
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