Basics

Linux id command

Show user and group IDs for the current user or another account.

Availability: Common Linux commands; shell built-ins and external implementations may differ by distribution.中文

Syntax

id [OPTION]... [USER]

Examples

Show IDs and groups for the current user.

id

Print the account name associated with the real user ID.

id -un alice

Parameters, options and clauses

Option / clause	Description
`-u, --user`	Print only the user ID.
`-g, --group`	Print only the primary group ID.
`-G, --groups`	Print all group IDs.
`-n, --name`	Show a name instead of a numeric ID; combine with -u, -g or -G.
`-r, --real`	Show the real ID rather than the effective ID.

Safety note

Review a command and its target before running it. Commands that alter files, services, accounts, disks, permissions or databases may be difficult to reverse. Test in a safe environment and keep backups.

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