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.\" 37.Dd "June 6, 1993" 38.Dt ID 1 39.Os BSD 4.4 40.Sh NAME 41.Nm id 42.Nd return user identity 43.Sh SYNOPSIS 44.Nm id 45.Op Ar user 46.Nm id 47.Fl G Op Fl n 48.Op Ar user 49.Nm id 50.Fl g Op Fl nr 51.Op Ar user 52.Nm id 53.Fl p 54.Nm id 55.Fl u Op Fl nr 56.Op Ar user 57.Sh DESCRIPTION 58The 59.Nm id 60utility displays the user and group names and numeric IDs, of the 61calling process, to the standard output. 62If the real and effective IDs are different, both are displayed, 63otherwise only the real ID is displayed. 64.Pp 65If a 66.Ar user 67(login name or user ID) 68is specified, the user and group IDs of that user are displayed. 69In this case, the real and effective IDs are assumed to be the same. 70.Pp 71The options are as follows: 72.Bl -tag -width Ds 73.It Fl G 74Display the different group IDs (effective, real and supplementary) 75as white-space separated numbers, in no particular order. 76.It Fl g 77Display the effective group ID as a number. 78.It Fl n 79Display the name of the user or group ID for the 80.Fl G , 81.Fl g 82and 83.Fl u 84options instead of the number. 85If any of the ID numbers cannot be mapped into names, the number will be 86displayed as usual. 87.It Fl p 88Make the output human-readable. 89If the user name returned by 90.Xr getlogin 2 91is different from the login name referenced by the user ID, the name 92returned by 93.Xr getlogin 2 94is displayed, preceded by the keyword ``login''. 95The user ID as a name is displayed, preceded by the keyword ``uid''. 96If the effective user ID is different from the real user ID, the real user 97ID is displayed as a name, preceded by the keyword ``euid''. 98If the effective group ID is different from the real group ID, the real group 99ID is displayed as a name, preceded by the keyword ``rgid''. 100The list of groups to which the user belongs is then displayed as names, 101preceded by the keyword ``groups''. 102Each display is on a separate line. 103.It Fl r 104Display the real ID for the 105.Fl g 106and 107.Fl u 108options instead of the effective ID. 109.It Fl u 110Display the effective user ID as a number. 111.El 112.Pp 113The 114.Nm id 115utility exits 0 on success, and >0 if an error occurs. 116.Sh SEE ALSO 117.Xr who 1 118.Sh STANDARDS 119The 120.Nm id 121function is expected to conform to 122.St -p1003.2 . 123.Sh HISTORY 124The 125historic 126.Xr groups 1 127command is equivalent to 128.Dq Nm id Fl Gn Op Ar user . 129.Pp 130The 131historic 132.Xr whoami 1 133command is equivalent to 134.Dq Nm id Fl un . 135.Pp 136The 137.Nm 138command appears in 139.Bx 4.4 . 140