1.\" $NetBSD: su.1,v 1.10 2023/06/30 21:46:20 christos Exp $ 2.\" 3.\"- 4.\" Copyright (c) 2011-2017 Dag-Erling Smørgrav 5.\" All rights reserved. 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. The name of the author may not be used to endorse or promote 16.\" products derived from this software without specific prior written 17.\" permission. 18.\" 19.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 20.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 23.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29.\" SUCH DAMAGE. 30.\" 31.Dd June 27, 2023 32.Dt SU 1 33.Os 34.Sh NAME 35.Nm su 36.Nd switch user identity 37.Sh SYNOPSIS 38.Nm 39.Op Ar login Op Ar ... 40.Sh DESCRIPTION 41The 42.Nm 43utility starts a shell under the identity of the user specified by the 44first argument on the command line. 45If no user is specified, the default is 46.Dq root . 47.Pp 48Any additional command-line arguments are passed as-is to the shell. 49.Pp 50The requesting user is authenticated using the 51.Dq su 52PAM policy. 53.Sh IMPLEMENTATION NOTES 54The 55.Nm 56utility is provided with the OpenPAM library as a sample application 57and should not be used in production systems. 58.Sh SEE ALSO 59.Xr openpam 3 , 60.Xr pam 3 61.Sh AUTHORS 62The 63.Nm 64utility and this manual page were written by 65.An Dag-Erling Sm\(/orgrav Aq Mt des@des.no . 66