id

NAME

id - print user identity

SYNOPSIS

id [OPTION]... [USERNAME]

DESCRIPTION

Print information for USERNAME, or the current user.

-a
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
--help
display this help and exit
--version
output version information and exit

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

AUTHOR

Written by Arnold Robbins and David MacKenzie.

REPORTING BUGS

Report bugs to <bug-coreutils@gnu.org>. Copyright © 2008 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law.

SEE ALSO

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.