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User identifier
Unix-like operating systems identify a user within the kernel by a value called a user identifier, often abbreviated to user ID or UID. The UID, along with the group identifier (GID) and other access control criteria, is used to determine which system resources a user can access. The password file maps textual user names to UIDs, but in the kernel, only UIDs are used. UIDs are stored in the inodes of the Unix file system, running processes, tar archives, and the now-obsolete Network Information Service. In POSIX-compliant environments, the command-line command id gives the current user's UID, as well as more information such as the user name, primary user group and group identifier (GID).
== Process attributes ==
The POSIX standard introduced three different UID fields into the process descriptor table, to allow privileged processes take on different roles dynamically:
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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