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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)