ID(1)                   System General Commands Manual                   ID(1)

NAME
     id - return user identity

SYNOPSIS
     id [-D] [user]
     id [-D] -G [-n] [user]
     id [-D] -g [-nr] [user]
     id [-D] -p [user]
     id [-D] -u [-nr] [user]

DESCRIPTION
     The id utility displays the user and group names and numeric IDs, of the
     calling process, to the standard output.  If the real and effective IDs
     are different, both are displayed, otherwise only the real ID is dis-
     played.

     If a user (login name or user ID) is specified, the user and group IDs of
     that user are displayed.  In this case, the real and effective IDs are
     assumed to be the same.

     The options are as follows:

     -D      Display the user and group names in fully qualified form (with
             domainname) even when the user/group name is a member of the
             principle domain.  By default the user and group names are only
             prefixed with the domainname when not a member of the principle
             domain.

     -G, --groups
             Display the different group IDs (effective, real and supplemen-
             tary) as whitespace separated numbers, in no particular order.

     -g, --group
             Display the effective group ID as a number.

     -n, --name
             Display the name of the user or group ID for the -G, -g and -u
             options instead of the number.  If any of the ID numbers cannot
             be mapped into names, the number will be displayed as usual.

     -p, --human
             Make the output human-readable.  If the user name returned by
             getlogin(2) is different from the login name referenced by the
             user ID, the name returned by getlogin(2) is displayed, preceded
             by the keyword ``login''.  The user ID as a name is displayed,
             preceded by the keyword ``uid''.  If the effective user ID is
             different from the real user ID, the real user ID is displayed as
             a name, preceded by the keyword ``euid''.  If the effective group
             ID is different from the real group ID, the real group ID is dis-
             played as a name, preceded by the keyword ``rgid''.  The list of
             groups to which the user belongs is then displayed as names, pre-
             ceded by the keyword ``groups''.  Each display is on a separate
             line.

     -r, --real
             Display the real ID for the -g and -u options instead of the
             effective ID.

     -u, --user
             Display the effective user ID as a number.

     The id utility exits 0 on success or >0 if an error occurred.

SEE ALSO
     who(1)

STANDARDS
     The id utility conforms to IEEE Std 1003.2 (``POSIX.2'').

HISTORY
     The historic groups(1) command is equivalent to id -Gn [user].

     The historic whoami(1) command is equivalent to id -un.

     The id command first appeared in 4.4BSD.

Interix                           May 5, 2007                          Interix