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Linux id command

id command in Linux with examples

The ‘id’ command in Linux is a powerful tool used to display user and group names along with their numeric IDs (User ID – UID or Group ID – GID) of the current user or any specified user on the system.

This command is particularly useful for system administrators and users who need to verify user identities and associated permissions.

What does the ‘id’ Command Do?

This command is useful to find out the following information as listed below:

User name and real user id.
Find out the specific User UID.
Show the UID and all groups associated with a user.
List out all the groups a user belongs to.
Display the security context of the current user.

Syntax:

id [OPTION]… [USER]

Options:

‘-g’: Prints only the effective group ID of the user.
‘-G’: Prints all group IDs associated with the user.
‘-n’: Displays names instead of numeric IDs.
‘-r’: Shows the real ID instead of the effective one.
‘-u’: Prints only the