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-.\" from: ksu.1,v 4.1 89/01/23 11:38:16 jtkohl Exp $
-.\" $Id: ksu.1,v 1.2 1994/07/19 19:27:57 g89r4222 Exp $
-.\"
-.\" Copyright (c) 1988 The Regents of the University of California.
-.\" All rights reserved.
-.\"
-.\" Redistribution and use in source and binary forms are permitted
-.\" provided that the above copyright notice and this paragraph are
-.\" duplicated in all such forms and that any documentation,
-.\" advertising materials, and other materials related to such
-.\" distribution and use acknowledge that the software was developed
-.\" by the University of California, Berkeley. The name of the
-.\" University may not be used to endorse or promote products derived
-.\" from this software without specific prior written permission.
-.\" THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
-.\" IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
-.\" WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
-.\"
-.\" @(#)su.1 6.7 (Berkeley) 12/7/88
-.\"
-.TH KSU 1 "Kerberos Version 4.0" "MIT Project Athena"
-.UC
-.SH NAME
-ksu \- substitute user id, using Kerberos
-.SH SYNOPSIS
-.B ksu
-[-flm] [login]
-.SH DESCRIPTION
-\fIKsu\fP requests the password for \fIlogin\fP (or for ``root'', if no
-login is provided), and switches to that user and group ID. A shell is
-then invoked.
-.PP
-By default, your environment is unmodified with the exception of
-\fIUSER\fP, \fIHOME\fP, and \fISHELL\fP. \fIHOME\fP and \fISHELL\fP
-are set to the target login's \fI/etc/passwd\fP values. \fIUSER\fP
-is set to the target login, unless the target login has a UID of 0,
-in which case it is unmodified. The invoked shell is the target
-login's. This is the traditional behavior of \fIksu\fP.
-.PP
-The \fI-l\fP option simulates a full login. The environment is discarded
-except for \fIHOME\fP, \fISHELL\fP, \fIPATH\fP, \fITERM\fP, and \fIUSER\fP.
-\fIHOME\fP and \fISHELL\fP are modified as above. \fIUSER\fP is set to
-the target login. \fIPATH\fP is set to ``/usr/ucb:/bin:/usr/bin''.
-\fITERM\fP is imported from your current environment. The invoked shell
-is the target login's, and \fIksu\fP will change directory to the target
-login's home directory.
-.PP
-The \fI-m\fP option causes the environment to remain unmodified, and
-the invoked shell to be your login shell. No directory changes are
-made. As a security precaution, if the
-.I -m
-option is specified, the target user's shell is a non-standard shell
-(as defined by \fIgetusershell\fP(3)) and the caller's real uid is
-non-zero,
-.I su
-will fail.
-.PP
-If the invoked shell is \fIcsh\fP, the \fI-f\fP option prevents it from
-reading the \fI.cshrc\fP file. Otherwise, this option is ignored.
-.PP
-Only users with root instances listed in /\&.klogin may \fIksu\fP to
-``root'' (The format of this file is described by \fIrlogin\fP(1).). When
-attempting root access, \fIksu\fP attempts to fetch a
-ticket-granting-ticket for ``username.root@localrealm'', where
-\fIusername\fP is the username of the process. If possible, the tickets
-are used to obtain, use, and verify tickets for the service
-``rcmd.host@localrealm'' where \fIhost\fP is the canonical host name (as
-determined by
-.IR krb_get_phost (3))
-of the machine. If this verification
-fails, the \fIksu\fP is disallowed (If the service
-``rcmd.host@localrealm'' is not registered, the \fIksu\fP is allowed.).
-.PP
-By default (unless the prompt is reset by a startup file) the super-user
-prompt is set to ``#'' to remind one of its awesome power.
-.PP
-When not attempting to switch to the ``root'' user,
-.I ksu
-behaves exactly like
-.IR su (1).
-.SH "SEE ALSO"
-su(1), csh(1), login(1), rlogin(1), sh(1), krb_get_phost(3), passwd(5),
-group(5), environ(7)
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