id

id linux command cheatsheet by Thamizhiniyan C S

Introduction

The id command is used to print real and effective user and group IDs

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Syntax

id [OPTION]... [USER]...

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Important Flags

Flag	Description
-g	Print only the effective group id.
-G	Print all Group ID’s.
-n	Prints name instead of number.
-r	Prints real ID instead of numbers.
-u	Prints only the effective user ID.
–help	Display help messages and exit.
–version	Display the version information and exit.

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Examples

Command	Description
id	Print the current user's UID and GID.
id -u root	Find the UID of the user named "root".
id -g root	Find the GID of the user named "root".
id root	Find the UID and all groups associated with the user "root".
id -G root	Display the UID and all groups a user "root" belongs to.
id -ng root	Display the name instead of numbers for GID of "root".
id -nu root	Display the name instead of numbers for UID of "root".
id -nG root	Display the name instead of numbers for all groups of "root".
id -r -g root	Display the real GID instead of effective GID of "root".
id -r -u root	Display the real UID instead of effective UID of "root".
id -r -G root	Display the real group IDs instead of effective groups of "root".