1.\" $NetBSD: id.1,v 1.8 1999/03/22 18:16:38 garbled 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 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 60The 61.Nm 62utility displays the user and group names and numeric IDs, of the 63calling process, to the standard output. 64If the real and effective IDs are different, both are displayed, 65otherwise only the real ID is displayed. 66.Pp 67If a 68.Ar user 69(login name or user ID) 70is specified, the user and group IDs of that user are displayed. 71In this case, the real and effective IDs are assumed to be the same. 72.Pp 73The options are as follows: 74.Bl -tag -width Ds 75.It Fl G 76Display the different group IDs (effective, real and supplementary) 77as white-space separated numbers, in no particular order. 78.It Fl g 79Display the effective group ID as a number. 80.It Fl n 81Display the name of the user or group ID for the 82.Fl G , 83.Fl g 84and 85.Fl u 86options instead of the number. 87If any of the ID numbers cannot be mapped into names, the number will be 88displayed as usual. 89.It Fl p 90Make the output human-readable. 91If the user name returned by 92.Xr getlogin 2 93is different from the login name referenced by the user ID, the name 94returned by 95.Xr getlogin 2 96is displayed, preceded by the keyword ``login''. 97The user ID as a name is displayed, preceded by the keyword ``uid''. 98If the effective user ID is different from the real user ID, the real user 99ID is displayed as a name, preceded by the keyword ``euid''. 100If the effective group ID is different from the real group ID, the real group 101ID is displayed as a name, preceded by the keyword ``rgid''. 102The list of groups to which the user belongs is then displayed as names, 103preceded by the keyword ``groups''. 104Each display is on a separate line. 105.It Fl r 106Display the real ID for the 107.Fl g 108and 109.Fl u 110options instead of the effective ID. 111.It Fl u 112Display the effective user ID as a number. 113.El 114.Pp 115The 116.Nm 117utility exits 0 on success, and >0 if an error occurs. 118.Sh SEE ALSO 119.Xr who 1 120.Sh STANDARDS 121The 122.Nm 123function is expected to conform to 124.St -p1003.2 . 125.Sh HISTORY 126The 127historic 128.Xr groups 1 129command is equivalent to 130.Dq Nm id Fl Gn Op Ar user . 131.Pp 132The 133historic 134.Xr whoami 1 135command is equivalent to 136.Dq Nm id Fl un . 137.Pp 138The 139.Nm 140command first appeared in 141.Bx 4.4 . 142