1.\" Copyright (c) 1991, 1993 2.\" The Regents of the University of California. All rights reserved. 3.\" 4.\" This code is derived from software contributed to Berkeley by 5.\" the Institute of Electrical and Electronics Engineers, Inc. 6.\" 7.\" Redistribution and use in source and binary forms, with or without 8.\" modification, are permitted provided that the following conditions 9.\" are met: 10.\" 1. Redistributions of source code must retain the above copyright 11.\" notice, this list of conditions and the following disclaimer. 12.\" 2. Redistributions in binary form must reproduce the above copyright 13.\" notice, this list of conditions and the following disclaimer in the 14.\" documentation and/or other materials provided with the distribution. 15.\" 3. All advertising materials mentioning features or use of this software 16.\" must display the following acknowledgement: 17.\" This product includes software developed by the University of 18.\" California, Berkeley and its contributors. 19.\" 4. Neither the name of the University nor the names of its contributors 20.\" may be used to endorse or promote products derived from this software 21.\" without specific prior written permission. 22.\" 23.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33.\" SUCH DAMAGE. 34.\" 35.\" @(#)id.1 8.1 (Berkeley) 6/6/93 36.\" $Id$ 37.\" 38.Dd "June 6, 1993" 39.Dt ID 1 40.Os BSD 4.4 41.Sh NAME 42.Nm id 43.Nd return user identity 44.Sh SYNOPSIS 45.Nm 46.Op Ar user 47.Nm 48.Fl G Op Fl n 49.Op Ar user 50.Nm 51.Fl g Op Fl nr 52.Op Ar user 53.Nm 54.Fl p 55.Nm 56.Fl u Op Fl nr 57.Op Ar user 58.Sh DESCRIPTION 59The 60.Nm 61utility displays the user and group names and numeric IDs, of the 62calling process, to the standard output. 63If the real and effective IDs are different, both are displayed, 64otherwise only the real ID is displayed. 65.Pp 66If a 67.Ar user 68(login name or user ID) 69is specified, the user and group IDs of that user are displayed. 70In this case, the real and effective IDs are assumed to be the same. 71.Pp 72The options are as follows: 73.Bl -tag -width Ds 74.It Fl G 75Display the different group IDs (effective, real and supplementary) 76as white-space separated numbers, in no particular order. 77.It Fl g 78Display the effective group ID as a number. 79.It Fl n 80Display the name of the user or group ID for the 81.Fl G , 82.Fl g 83and 84.Fl u 85options instead of the number. 86If any of the ID numbers cannot be mapped into names, the number will be 87displayed as usual. 88.It Fl p 89Make the output human-readable. 90If the user name returned by 91.Xr getlogin 2 92is different from the login name referenced by the user ID, the name 93returned by 94.Xr getlogin 2 95is displayed, preceded by the keyword 96.Dq login . 97The user ID as a name is displayed, preceded by the keyword 98.Dq uid . 99If the effective user ID is different from the real user ID, the real user 100ID is displayed as a name, preceded by the keyword 101.Dq euid . 102If the effective group ID is different from the real group ID, the real group 103ID is displayed as a name, preceded by the keyword 104.Dq rgid . 105The list of groups to which the user belongs is then displayed as names, 106preceded by the keyword 107.Dq groups . 108Each display is on a separate line. 109.It Fl r 110Display the real ID for the 111.Fl g 112and 113.Fl u 114options instead of the effective ID. 115.It Fl u 116Display the effective user ID as a number. 117.El 118.Pp 119The 120.Nm 121utility exits 0 on success, and >0 if an error occurs. 122.Sh SEE ALSO 123.Xr who 1 124.Sh STANDARDS 125The 126.Nm 127function is expected to conform to 128.St -p1003.2 . 129.Sh HISTORY 130The 131historic 132.Xr groups 1 133command is equivalent to 134.Dq Nm id Fl Gn Op Ar user . 135.Pp 136The 137historic 138.Xr whoami 1 139command is equivalent to 140.Dq Nm id Fl un . 141.Pp 142The 143.Nm 144command appeared in 145.Bx 4.4 . 146