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.\" $OpenBSD: id.1,v 1.9 2000/03/07 21:11:10 aaron Exp $
.\" $NetBSD: id.1,v 1.5 1995/09/28 08:05:40 perry Exp $
.\"
.\" Copyright (c) 1991, 1993, 1994
.\" The Regents of the University of California. All rights reserved.
.\"
.\" This code is derived from software contributed to Berkeley by
.\" the Institute of Electrical and Electronics Engineers, Inc.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\" 3. All advertising materials mentioning features or use of this software
.\" must display the following acknowledgement:
.\" This product includes software developed by the University of
.\" California, Berkeley and its contributors.
.\" 4. Neither the name of the University nor the names of its contributors
.\" may be used to endorse or promote products derived from this software
.\" without specific prior written permission.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
.\" @(#)id.1 8.2 (Berkeley) 5/5/94
.\"
.Dd May 5, 1994
.Dt ID 1
.Os
.Sh NAME
.Nm id
.Nd return user identity
.Sh SYNOPSIS
.Nm id
.Op Ar user
.Nm id
.Fl G Op Fl n
.Op Ar user
.Nm id
.Fl g Op Fl nr
.Op Ar user
.Nm id
.Fl p
.Nm id
.Fl u Op Fl nr
.Op Ar user
.Sh DESCRIPTION
The
.Nm
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 displayed.
.Pp
If a
.Ar 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.
.Pp
The options are as follows:
.Bl -tag -width Ds
.It Fl G
Display the different group IDs (effective, real and supplementary)
as whitespace separated numbers, in no particular order.
.It Fl g
Display the effective group ID as a number.
.It Fl n
Display the name of the user or group ID for the
.Fl G ,
.Fl g
and
.Fl u
options instead of the number.
If any of the ID numbers cannot be mapped into names, the number will be
displayed as usual.
.It Fl p
Make the output human-readable.
If the user name returned by
.Xr getlogin 2
is different from the login name referenced by the user ID, the name
returned by
.Xr getlogin 2
is displayed, preceded by the keyword
.Dq login .
The user ID as a name is displayed, preceded by the keyword
.Dq 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
.Dq euid .
If the effective group ID is different from the real group ID, the real group
ID is displayed as a name, preceded by the keyword
.Dq rgid .
The list of groups to which the user belongs is then displayed as names,
preceded by the keyword
.Dq groups .
Each display is on a separate line.
.It Fl r
Display the real ID for the
.Fl g
and
.Fl u
options instead of the effective ID.
.It Fl u
Display the effective user ID as a number.
.El
.Pp
The
.Nm
utility exits 0 on success or >0 if an error occurred.
.Sh SEE ALSO
.Xr who 1
.Sh STANDARDS
The
.Nm
function is expected to conform to
.St -p1003.2 .
.Sh HISTORY
The
historic
.Xr groups 1
command is equivalent to
.Ic id Fl Gn Op Ar user .
.Pp
The
historic
.Xr whoami 1
command is equivalent to
.Ic Nm id Fl un .
.Pp
The
.Nm
command first appeared in
.Bx 4.4 .
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