89 lines
3.3 KiB
Groff
89 lines
3.3 KiB
Groff
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.\" Copyright 1989 - 1992, Julianne Frances Haugh
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. Neither the name of Julianne F. Haugh nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY JULIE HAUGH AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL JULIE HAUGH OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $Id: sulogin.8,v 1.4 1998/12/28 20:35:27 marekm Exp $
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.\"
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.TH SULOGIN 8
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.SH NAME
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sulogin \- Single-user login
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.SH SYNTAX
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\fBsulogin\fR [\fItty-device\fR]
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.SH DESCRIPTION
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.B sulogin
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is invoked by \fBinit\fR prior to allowing the user
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access to the system when in single user mode.
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This feature may only be available on certain systems where
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\fBinit\fR has been modified accordingly, or where the
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\fB/etc/inittab\fR has an entry for a single user login.
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.PP
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The user is prompted
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.IP "" .5i
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Type control-d to proceed with normal startup,
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.br
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(or give root password for system maintenance):
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.PP
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Input and output will be performed with the standard file
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descriptors unless the optional device name argument is provided.
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.PP
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If the user enters the correct root password, a login session
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is initiated.
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When \fBEOF\fR is pressed instead, the system enters multi-user
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mode.
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.PP
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After the user exits the single-user shell, or presses \fBEOF\fR,
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the system begins the initialization process required to enter
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multi-user mode.
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.SH CAVEATS
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.PP
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This command can only be used if \fBinit\fR has been modified to call
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\fBsulogin\fR instead of \fB/bin/sh\fR,
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or if the user has set the \fIinittab\fR to support a single user
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login.
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For example, the line
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.br
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.sp 1
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co:s:respawn:/etc/sulogin /dev/console
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.br
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.sp 1
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should execute the sulogin command in single user mode.
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.PP
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As complete an environment as possible is created.
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However, various devices may be unmounted or uninitialized and many
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of the user commands may be unavailable or nonfunctional as a result.
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.SH FILES
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/etc/passwd \- user account information
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.br
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/etc/shadow \- encrypted passwords and age information
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.br
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/.profile \- initialization script for single user shell
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.SH SEE ALSO
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.BR login (1),
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.BR init (8),
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.BR sh (1)
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.SH AUTHOR
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Julianne Frances Haugh (jfh@bga.com)
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