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-.\" Copyright (c) 2003 - 2006 Kungliga Tekniska Högskolan
-.\" (Royal Institute of Technology, Stockholm, Sweden).
-.\" All rights reserved.
-.\"
-.\" Redistribution and use in source and binary forms, with or without
-.\" modification, are permitted provided that the following conditions
-.\" are met:
-.\"
-.\" 1. Redistributions of source code must retain the above copyright
-.\"    notice, this list of conditions and the following disclaimer.
-.\"
-.\" 2. Redistributions in binary form must reproduce the above copyright
-.\"    notice, this list of conditions and the following disclaimer in the
-.\"    documentation and/or other materials provided with the distribution.
-.\"
-.\" 3. Neither the name of the Institute nor the names of its contributors
-.\"    may be used to endorse or promote products derived from this software
-.\"    without specific prior written permission.
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
-.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
-.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
-.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
-.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
-.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
-.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
-.\" SUCH DAMAGE.
-.\"
-.\" $Id$
-.\"
-.Dd January 12, 2006
-.Dt SU 1
-.Os HEIMDAL
-.Sh NAME
-.Nm su
-.Nd substitute user identity
-.Sh SYNOPSIS
-.Nm su
-.Op Fl K | Fl Fl no-kerberos
-.Op Fl f
-.Op Fl l | Fl Fl full
-.Op Fl m
-.Oo Fl i Ar instance \*(Ba Xo
-.Fl Fl instance= Ns Ar instance
-.Xc
-.Oc
-.Oo Fl c Ar command \*(Ba Xo
-.Fl Fl command= Ns Ar command
-.Xc
-.Oc
-.Op Ar login Op Ar "shell arguments"
-.Sh DESCRIPTION
-.Nm su
-will use Kerberos authentication provided that an instance for the
-user wanting to change effective UID is present in a file named
-.Pa .k5login
-in the target user id's home directory
-.Pp
-A special case exists where
-.Ql root Ap s
-.Pa ~/.k5login
-needs to contain an entry for:
-.Ql user Ns / Ns Ao instance Ac Ns @ Ns REALM
-for
-.Nm su
-to succed (where
-.Aq instance
-is
-.Ql root
-unless changed with
-.Fl i ) .
-.Pp
-In the absence of either an entry for current user in said file or
-other problems like missing
-.Ql host/hostname@REALM
-keys in the system's
-keytab, or user typing the wrong password,
-.Nm su
-will fall back to traditional
-.Pa /etc/passwd
-authentication.
-.Pp
-When using
-.Pa /etc/passwd
-authentication,
-.Nm su
-allows
-.Ql root
-access only to members of the group
-.Ql wheel ,
-or to any user (with knowledge of the
-.Ql root
-password) if that group
-does not exist, or has no members.
-.Pp
-The options are as follows:
-.Bl -item -width Ds
-.It
-.Fl K ,
-.Fl Fl no-kerberos
-don't use Kerberos.
-.It
-.Fl f
-don't read .cshrc.
-.It
-.Fl l ,
-.Fl Fl full
-simulate full login.
-.It
-.Fl m
-leave environment unmodified.
-.It
-.Fl i Ar instance ,
-.Fl Fl instance= Ns Ar instance
-root instance to use.
-.It
-.Fl c Ar command ,
-.Fl Fl command= Ns Ar command
-command to execute.
-.El