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: id.1,v 1.4 1998/02/28 21:37:54 alex Exp $ 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 id 48.Fl G Op Fl n 49.Op Ar user 50.Nm id 51.Fl P 52.Op Ar user 53.Nm id 54.Fl g Op Fl nr 55.Op Ar user 56.Nm id 57.Fl p 58.Nm id 59.Fl u Op Fl nr 60.Op Ar user 61.Sh DESCRIPTION 62The 63.Nm 64utility displays the user and group names and numeric IDs, of the 65calling process, to the standard output. 66If the real and effective IDs are different, both are displayed, 67otherwise only the real ID is displayed. 68.Pp 69If a 70.Ar user 71(login name or user ID) 72is specified, the user and group IDs of that user are displayed. 73In this case, the real and effective IDs are assumed to be the same. 74.Pp 75The options are as follows: 76.Bl -tag -width Ds 77.It Fl G 78Display the different group IDs (effective, real and supplementary) 79as white-space separated numbers, in no particular order. 80.It Fl P 81Display the id as a password file entry. 82.It Fl g 83Display the effective group ID as a number. 84.It Fl n 85Display the name of the user or group ID for the 86.Fl G , 87.Fl g 88and 89.Fl u 90options instead of the number. 91If any of the ID numbers cannot be mapped into names, the number will be 92displayed as usual. 93.It Fl p 94Make the output human-readable. 95If the user name returned by 96.Xr getlogin 2 97is different from the login name referenced by the user ID, the name 98returned by 99.Xr getlogin 2 100is displayed, preceded by the keyword 101.Dq login . 102The user ID as a name is displayed, preceded by the keyword 103.Dq uid . 104If the effective user ID is different from the real user ID, the real user 105ID is displayed as a name, preceded by the keyword 106.Dq euid . 107If the effective group ID is different from the real group ID, the real group 108ID is displayed as a name, preceded by the keyword 109.Dq rgid . 110The list of groups to which the user belongs is then displayed as names, 111preceded by the keyword 112.Dq groups . 113Each display is on a separate line. 114.It Fl r 115Display the real ID for the 116.Fl g 117and 118.Fl u 119options instead of the effective ID. 120.It Fl u 121Display the effective user ID as a number. 122.El 123.Pp 124The 125.Nm 126utility exits 0 on success, and >0 if an error occurs. 127.Sh SEE ALSO 128.Xr who 1 129.Sh STANDARDS 130The 131.Nm 132function is expected to conform to 133.St -p1003.2 . 134.Sh HISTORY 135The 136historic 137.Xr groups 1 138command is equivalent to 139.Dq Nm id Fl Gn Op Ar user . 140.Pp 141The 142historic 143.Xr whoami 1 144command is equivalent to 145.Dq Nm id Fl un . 146.Pp 147The 148.Nm 149command appeared in 150.Bx 4.4 . 151