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-.\" Copyright (c) 1988, 1990 The Regents of the University of California.
-.\" 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. All advertising materials mentioning features or use of this software
-.\"    must display the following acknowledgement:
-.\"	This product includes software developed by the University of
-.\"	California, Berkeley and its contributors.
-.\" 4. Neither the name of the University 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 REGENTS 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 REGENTS 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.
-.\"
-.\"	from: @(#)su.1	6.12 (Berkeley) 7/29/91
-.\"	$Id: su.1,v 1.3 1996/02/11 23:56:09 d91-jda Exp $
-.\"
-.Dd July 29, 1991
-.Dt SU 1
-.Os
-.Sh NAME
-.Nm su
-.Nd substitute user identity
-.Sh SYNOPSIS
-.Nm su
-.Op Fl Kflmi
-.Op Ar login Op Ar "shell arguments"
-.Sh DESCRIPTION
-.Nm Su
-requests the Kerberos password for
-.Ar login
-(or for
-.Dq Ar login Ns .root ,
-if no login is provided), and switches to
-that user and group ID after obtaining a Kerberos ticket granting ticket.
-A shell is then executed, and any additional
-.Ar "shell arguments"
-after the login name
-are passed to the shell.
-.Nm Su
-will resort to the local password file to find the password for
-.Ar login
-if there is a Kerberos error.
-If
-.Nm su
-is executed by root, no password is requested and a shell
-with the appropriate user ID is executed; no additional Kerberos tickets
-are obtained.
-.Pp
-Alternately, if the user enters the password "s/key", they will be
-authenticated using the S/Key one-time password system as described in
-.Xr skey 1 .
-S/Key is a Trademark of Bellcore.
-.Pp
-By default, the environment is unmodified with the exception of
-.Ev USER ,
-.Ev HOME ,
-and
-.Ev SHELL .
-.Ev HOME
-and
-.Ev SHELL
-are set to the target login's default values.
-.Ev USER
-is set to the target login, unless the target login has a user ID of 0,
-in which case it is unmodified.
-The invoked shell is the target login's.
-This is the traditional behavior of
-.Nm su .
-.Pp
-The options are as follows:
-.Bl -tag -width Ds
-.It Fl K
-Do not attempt to use Kerberos to authenticate the user.
-.It Fl f
-If the invoked shell is
-.Xr csh 1 ,
-this option prevents it from reading the
-.Dq Pa .cshrc
-file.
-.It Fl l
-Simulate a full login.
-The environment is discarded except for
-.Ev HOME ,
-.Ev SHELL ,
-.Ev PATH ,
-.Ev TERM ,
-and
-.Ev USER .
-.Ev HOME
-and
-.Ev SHELL
-are modified as above.
-.Ev USER
-is set to the target login.
-.Ev PATH
-is set to
-.Dq Pa /bin:/usr/bin .
-.Ev TERM
-is imported from your current environment.
-The invoked shell is the target login's, and
-.Nm su
-will change directory to the target login's home directory.
-.It Fl m
-Leave the environment unmodified.
-The invoked shell is your login shell, and no directory changes are made.
-As a security precaution, if the target user's shell is a non-standard
-shell (as defined by
-.Xr getusershell 3 )
-and the caller's real uid is
-non-zero,
-.Nm su
-will fail.
-.It Fl i
-If the kerberos root instance is not root any other value can be passed
-using this switch.
-.El
-.Pp
-The
-.Fl l
-and
-.Fl m
-options are mutually exclusive; the last one specified
-overrides any previous ones.
-.Pp
-Only users mentioned in
-.Dq Pa ~root/.klogin
-(or in group 0 when not doing kerberos) can
-.Nm su
-to
-.Dq root .
-.Pp
-By default (unless the prompt is reset by a startup file) the super-user
-prompt is set to
-.Dq Sy \&#
-to remind one of its awesome power.
-.Sh SEE ALSO
-.Xr csh 1 ,
-.Xr login 1 ,
-.Xr sh 1 ,
-.Xr skey 1 ,
-.Xr kinit 1 ,
-.Xr kerberos 1 ,
-.Xr passwd 5 ,
-.Xr group 5 ,
-.Xr environ 7
-.Sh ENVIRONMENT
-Environment variables used by
-.Nm su :
-.Bl -tag -width HOME
-.It Ev HOME
-Default home directory of real user ID unless modified as
-specified above.
-.It Ev PATH
-Default search path of real user ID unless modified as specified above.
-.It Ev TERM
-Provides terminal type which may be retained for the substituted
-user ID.
-.It Ev USER
-The user ID is always the effective ID (the target user ID) after an
-.Nm su
-unless the user ID is 0 (root).
-.El
-.Sh HISTORY
-A
-.Nm
-command appeared in
-.At v7 .
-The version described
-here is an adaptation of the
-.Tn MIT
-Athena Kerberos command.