1.\"- 2.\" Copyright (c) 2011-2017 Dag-Erling Smørgrav 3.\" All rights reserved. 4.\" 5.\" Redistribution and use in source and binary forms, with or without 6.\" modification, are permitted provided that the following conditions 7.\" are met: 8.\" 1. Redistributions of source code must retain the above copyright 9.\" notice, this list of conditions and the following disclaimer. 10.\" 2. Redistributions in binary form must reproduce the above copyright 11.\" notice, this list of conditions and the following disclaimer in the 12.\" documentation and/or other materials provided with the distribution. 13.\" 3. The name of the author may not be used to endorse or promote 14.\" products derived from this software without specific prior written 15.\" permission. 16.\" 17.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 21.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27.\" SUCH DAMAGE. 28.\" 29.Dd June 27, 2023 30.Dt SU 1 31.Os 32.Sh NAME 33.Nm su 34.Nd switch user identity 35.Sh SYNOPSIS 36.Nm 37.Op Ar login Op Ar ... 38.Sh DESCRIPTION 39The 40.Nm 41utility starts a shell under the identity of the user specified by the 42first argument on the command line. 43If no user is specified, the default is 44.Dq root . 45.Pp 46Any additional command-line arguments are passed as-is to the shell. 47.Pp 48The requesting user is authenticated using the 49.Dq su 50PAM policy. 51.Sh IMPLEMENTATION NOTES 52The 53.Nm 54utility is provided with the OpenPAM library as a sample application 55and should not be used in production systems. 56.Sh SEE ALSO 57.Xr openpam 3 , 58.Xr pam 3 59.Sh AUTHORS 60The 61.Nm 62utility and this manual page were written by 63.An Dag-Erling Sm\(/orgrav Aq Mt des@des.no . 64