User Id (CloudMonk.io)

User ID

See also user (computing), Password management, Password fatigue, Authentication, Personal identification number (PIN), Password, Password manager, Single signon, MFA-2FA, Microsoft Hello, Apple Face ID, Facial recognition, Biometric authentication, Iris recognition, Retinal scan, Eye vein verification, Recognition, Fingerprint recognition

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 Passwd (file)|password file maps textual User (computing)|user names to UIDs. UIDs are stored in the inodes of the Unix file system, running Process (computing)|processes, tar (computing)|tar archives, and the now-obsolete Network Information Service. In POSIX-compliant environments, the command-line UNIX commands | command Id (Unix) | id gives the current user's UID, as well as more information such as the user name, primary user group and group identifier (GID).

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