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What (who) is user ID - 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 id

user identifier

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

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

Examples of use of user ID

1. "Registrations closed late last month and each of the 174 children was given a domain name, user ID and password.

2. Yahoo, especially, must be singled out for handing over to Chinese officials the user ID of a local dissident journalist who then was jailed for 10 years.

3. Have your say» People taking part in the trial will log on to the site using their user ID and password in the same way as they do at the moment.

4. "Even if the fraudster gets hold of someone‘s password and user ID, they won‘t be able to log on without the device," said a Lloyds spokesman, Emile Abu–Shakra.

5. During the course of investigations, it was revealed that Adarsh Sinha had set up a user ID on Orkut under the name of Fazal Farooqui of Lucknow and was issuing threats to Thackeray on the website.