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In a single-protocol environment, the UNIX Identifier (UID) identifies a user with a positive integer assigned by a Lightweight Directory Access Protocol (LDAP) server. The UID maps to several Group Identifiers (GID) to determine access permissions. At login, the user ID is mapped to the matching UID and GID. The UID and GID for a user are displayed with an LDAP query in the following figure:
Figure 2. UNIX Identifier UID and GID