1.\"- 2.\" Copyright (c) 2011 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.\" 14.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24.\" SUCH DAMAGE. 25.\" 26.\" $Id: su.1 458 2011-11-02 13:10:25Z des $ 27.\" 28.Dd November 2, 2011 29.Dt SU 1 30.Os 31.Sh NAME 32.Nm su 33.Nd switch user identity 34.Sh SYNOPSYS 35.Nm 36.Op Ar login Op Ar ... 37.Sh DESCRIPTION 38The 39.Nm 40utility starts a shell under the identity of the user specified by the 41first argument on the command line. 42If no user is specified, the default is 43.Dq root . 44.Pp 45Any additional command-line arguments are passed as-is to the shell. 46.Pp 47The requesting user is authenticated using the 48.Dq su 49PAM policy. 50.Sh IMPLEMENTATION NOTES 51The 52.Nm 53utility is provided with the OpenPAM library as a sample application 54and should not be used in production systems. 55.Sh SEE ALSO 56.Xr openpam 3 57.Xr pam 3 58.Sh AUTHORS 59The 60.Nm 61utility and this manual page were written by 62.An Dag-Erling Sm\(/orgrav Aq des@FreeBSD.org . 63