Penguin
Note: You are viewing an old revision of this page. View the current version.

Acronym for User ID.

The numerical id that corresponds to a user. For example 0 is usually root. bobs UID might be 500. UID to name mappings are stored in /etc/passwd (see passwd(5))

A program is said to be "SUID" when the file has the "+s" user permission bit set, so the program will run as the permissions of the user that owned the file, not the user that ran the file.