id — print real and effective user and group IDs




Print user and group information for the specified USERNAME, or (when USERNAME omitted) for the current user.


ignore, for compatibility with other versions

−Z, −−context

print only the security context of the current user

−g, −−group

print only the effective group ID

−G, −−groups

print all group IDs

−n, −−name

print a name instead of a number, for −ugG

−r, −−real

print the real ID instead of the effective ID, with −ugG

−u, −−user

print only the effective user ID


display this help and exit


output version information and exit

Without any OPTION, print some useful set of identified information.


Written by Arnold Robbins and David MacKenzie.


Report id bugs to bug−

GNU coreutils home page: <>

General help using GNU software: <>

Report id translation bugs to <>


The full documentation for id is maintained as a Texinfo manual. If the info and id programs are properly installed at your site, the command

  • info coreutils 'id invocation'

should give you access to the complete manual.


Copyright © 2013 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <>.

This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law.