A UID, or User Identifier, is a unique numeric value assigned to each user on a Unix/Linux system. It serves several purposes:
Key Points:
- Uniqueness: Each user has a distinct UID, which differentiates them from other users.
- Permissions: The UID is used by the system to manage user permissions and access rights.
- Root User: The root user has a UID of 0, granting full administrative privileges.
Example:
When you run the command id username, the output includes the UID, which helps identify the user in the system.
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