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What (who) is user identifier - definition

NUMERIC VALUE USED IN UNIX-LIKE OPERATING SYSTEMS TO UNIQUELY IDENTIFY A USER ACCOUNT

User id; User identifier (unix); User ID; Userid; User-ID; User identifier (Unix); Real user ID; Effective user ID; Saved user ID; Effective userid; Real userid

user identifier

<operating system> 1. (Or "uid", "user id") A number or name which is unique to a particular user of a computer or group of computers which share user information. The {operating system} uses the uid to represent the user in its data structures, e.g. the owner of a file or process, the person attempting to access a system resource etc. A user database, e.g. Unix's /etc/passwd file or NIS, maps the uid to other information about that user such as their user name, password, home directory and real name. 2. user name. (1997-03-01)

User identifier

Unix-like operating systems identify a user 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.

https://en.wikipedia.org/wiki/User_identifier

user id

user identifier

Wikipedia

User identifier

Unix-like operating systems identify a user 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. 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).

https://en.wikipedia.org/wiki/User identifier