1.\" $NetBSD: id.1,v 1.12 2004/11/19 14:18:01 peter 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. Neither the name of the University nor the names of its contributors 18.\" may be used to endorse or promote products derived from this software 19.\" without specific prior written permission. 20.\" 21.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31.\" SUCH DAMAGE. 32.\" 33.\" @(#)id.1 8.2 (Berkeley) 5/5/94 34.\" 35.Dd May 5, 1994 36.Dt ID 1 37.Os 38.Sh NAME 39.Nm id 40.Nd return user identity 41.Sh SYNOPSIS 42.Nm 43.Op Ar user 44.Nm 45.Fl G Op Fl n 46.Op Ar user 47.Nm 48.Fl g Op Fl nr 49.Op Ar user 50.Nm 51.Fl p 52.Op Ar user 53.Nm 54.Fl u Op Fl nr 55.Op Ar user 56.Sh DESCRIPTION 57The 58.Nm 59utility displays the user and group names and numeric IDs, of the 60calling process, to the standard output. 61If the real and effective IDs are different, both are displayed, 62otherwise only the real ID is displayed. 63.Pp 64If a 65.Ar user 66(login name or user ID) 67is specified, the user and group IDs of that user are displayed. 68In this case, the real and effective IDs are assumed to be the same. 69.Pp 70The options are as follows: 71.Bl -tag -width Ds 72.It Fl G 73Display the different group IDs (effective, real and supplementary) 74as white-space separated numbers, in no particular order. 75.It Fl g 76Display the effective group ID as a number. 77.It Fl n 78Display the name of the user or group ID for the 79.Fl G , 80.Fl g 81and 82.Fl u 83options instead of the number. 84If any of the ID numbers cannot be mapped into names, the number will be 85displayed as usual. 86.It Fl p 87Make the output human-readable. 88If the user name returned by 89.Xr getlogin 2 90is different from the login name referenced by the user ID, the name 91returned by 92.Xr getlogin 2 93is displayed, preceded by the keyword ``login''. 94The user ID as a name is displayed, preceded by the keyword ``uid''. 95If the effective user ID is different from the real user ID, the real user 96ID is displayed as a name, preceded by the keyword ``euid''. 97If the effective group ID is different from the real group ID, the real group 98ID is displayed as a name, preceded by the keyword ``rgid''. 99The list of groups to which the user belongs is then displayed as names, 100preceded by the keyword ``groups''. 101Each display is on a separate line. 102.It Fl r 103Display the real ID for the 104.Fl g 105and 106.Fl u 107options instead of the effective ID. 108.It Fl u 109Display the effective user ID as a number. 110.El 111.Pp 112The 113.Nm 114utility exits 0 on success, and \*[Gt]0 if an error occurs. 115.Sh SEE ALSO 116.Xr who 1 117.Sh STANDARDS 118The 119.Nm 120function is expected to conform to 121.St -p1003.2 . 122.Sh HISTORY 123The 124historic 125.Xr groups 1 126command is equivalent to 127.Dq Nm id Fl Gn Op Ar user . 128.Pp 129The 130historic 131.Xr whoami 1 132command is equivalent to 133.Dq Nm id Fl un . 134.Pp 135The 136.Nm 137command first appeared in 138.Bx 4.4 . 139