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	1	.\" $NetBSD: id.1,v 1.7 1997/10/19 02:45:47 lukem Exp $
	2	.\"
	3	.\" Copyright (c) 1991, 1993, 1994
	4	.\" The Regents of the University of California. All rights reserved.
	5	.\"
	6	.\" This code is derived from software contributed to Berkeley by
	7	.\" the Institute of Electrical and Electronics Engineers, Inc.
	8	.\"
	9	.\" Redistribution and use in source and binary forms, with or without
	10	.\" modification, are permitted provided that the following conditions
	11	.\" are met:
	12	.\" 1. Redistributions of source code must retain the above copyright
	13	.\" notice, this list of conditions and the following disclaimer.
	14	.\" 2. Redistributions in binary form must reproduce the above copyright
	15	.\" notice, this list of conditions and the following disclaimer in the
	16	.\" documentation and/or other materials provided with the distribution.
	17	.\" 3. All advertising materials mentioning features or use of this software
	18	.\" must display the following acknowledgement:
	19	.\" This product includes software developed by the University of
	20	.\" California, Berkeley and its contributors.
	21	.\" 4. Neither the name of the University nor the names of its contributors
	22	.\" may be used to endorse or promote products derived from this software
	23	.\" without specific prior written permission.
	24	.\"
	25	.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	26	.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	27	.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	28	.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	29	.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	30	.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	31	.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	32	.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	33	.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	34	.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	35	.\" SUCH DAMAGE.
	36	.\"
	37	.\" @(#)id.1 8.2 (Berkeley) 5/5/94
	38	.\"
	39	.Dd May 5, 1994
	40	.Dt ID 1
	41	.Os BSD 4.4
	42	.Sh NAME
	43	.Nm id
	44	.Nd return user identity
	45	.Sh SYNOPSIS
	46	.Nm
	47	.Op Ar user
	48	.Nm ""
	49	.Fl G Op Fl n
	50	.Op Ar user
	51	.Nm ""
	52	.Fl g Op Fl nr
	53	.Op Ar user
	54	.Nm ""
	55	.Fl p
	56	.Nm ""
	57	.Fl u Op Fl nr
	58	.Op Ar user
	59	.Sh DESCRIPTION
	60	The
	61	.Nm
	62	utility displays the user and group names and numeric IDs, of the
	63	calling process, to the standard output.
	64	If the real and effective IDs are different, both are displayed,
	65	otherwise only the real ID is displayed.
	66	.Pp
	67	If a
	68	.Ar user
	69	(login name or user ID)
	70	is specified, the user and group IDs of that user are displayed.
	71	In this case, the real and effective IDs are assumed to be the same.
	72	.Pp
	73	The options are as follows:
	74	.Bl -tag -width Ds
	75	.It Fl G
	76	Display the different group IDs (effective, real and supplementary)
	77	as white-space separated numbers, in no particular order.
	78	.It Fl g
	79	Display the effective group ID as a number.
	80	.It Fl n
	81	Display the name of the user or group ID for the
	82	.Fl G ,
	83	.Fl g
	84	and
	85	.Fl u
	86	options instead of the number.
	87	If any of the ID numbers cannot be mapped into names, the number will be
	88	displayed as usual.
	89	.It Fl p
	90	Make the output human-readable.
	91	If the user name returned by
	92	.Xr getlogin 2
	93	is different from the login name referenced by the user ID, the name
	94	returned by
	95	.Xr getlogin 2
	96	is displayed, preceded by the keyword ``login''.
	97	The user ID as a name is displayed, preceded by the keyword ``uid''.
	98	If the effective user ID is different from the real user ID, the real user
	99	ID is displayed as a name, preceded by the keyword ``euid''.
	100	If the effective group ID is different from the real group ID, the real group
	101	ID is displayed as a name, preceded by the keyword ``rgid''.
	102	The list of groups to which the user belongs is then displayed as names,
	103	preceded by the keyword ``groups''.
	104	Each display is on a separate line.
	105	.It Fl r
	106	Display the real ID for the
	107	.Fl g
	108	and
	109	.Fl u
	110	options instead of the effective ID.
	111	.It Fl u
	112	Display the effective user ID as a number.
	113	.El
	114	.Pp
	115	The
	116	.Nm
	117	utility exits 0 on success, and >0 if an error occurs.
	118	.Sh SEE ALSO
	119	.Xr who 1
	120	.Sh STANDARDS
	121	The
	122	.Nm
	123	function is expected to conform to
	124	.St -p1003.2 .
	125	.Sh HISTORY
	126	The
	127	historic
	128	.Xr groups 1
	129	command is equivalent to
	130	.Dq Nm id Fl Gn Op Ar user .
	131	.Pp
	132	The
	133	historic
	134	.Xr whoami 1
	135	command is equivalent to
	136	.Dq Nm id Fl un .
	137	.Pp
	138	The
	139	.Nm
	140	command first appeared in
	141	.Bx 4.4 .