117 lines
3.5 KiB
Groff
117 lines
3.5 KiB
Groff
.\" Copyright (c) 2002 Gordon Tetlow
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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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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 THE AUTHOR 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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.\" $FreeBSD$
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.\"
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.\" Note: The date here should be updated whenever a non-trivial
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.\" change is made to the manual page.
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.Dd November 4, 2002
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.Dt NEXTBOOT 8
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.Os
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.Sh NAME
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.Nm nextboot
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.Nd specify an alternate kernel and boot flags for the next reboot
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.Sh SYNOPSIS
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.Nm
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.Op Fl f
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.Op Fl o Ar options
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.Fl k Ar kernel
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.Nm
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.Fl D
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.Sh DESCRIPTION
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The
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.Nm
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utility allows specifying an alernate kernel and/or boot flags for the
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next time the machine is booted. Once the loader loads in the new kernel
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information, it is deleted so in case the new kernel hangs the machine,
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once it is rebooted, the machine will automatically revert to it's previous
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configuration.
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.Pp
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The options are as follows:
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.Bl -tag -width ".Fl o Ar options"
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.It Fl D
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Invoking
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.Nm
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with the
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.Fl D
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option removes an existing nextboot configuration
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.It Fl f
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The
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.Fl f
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option disables the sanity checking which checks if the kernel really exists
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before writing the nextboot configuration.
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.It Fl k Ar kernel
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The
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.Fl k
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option with required kernel argument specifies a kernel directory relative to
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.Pa /boot
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to load the kernel and any modules from.
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.It Fl o Ar options
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The
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.Fl o
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allows the passing of kernel flags for the nextboot.
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.El
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.Sh FILES
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.Bl -tag -width ".Pa /boot/nextboot.conf" -compact
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.It Pa /boot/nextboot.conf
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The configuration file that the nextboot configuration is written into.
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.El
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.Sh EXAMPLES
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To boot the GENERIC kernel with the
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.Nm
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command:
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.Pp
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.Dl "nextboot -k GENERIC"
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.Pp
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To enable into single user mode with the normal kernel:
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.Pp
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.Dl "nextboot -o ""-s"" -k kernel"
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.Pp
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To remove an existing nextboot configuration:
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.Pp
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.Dl "nextboot -D"
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.Sh SEE ALSO
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.Xr boot 8 ,
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.Xr loader 8
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.Sh HISTORY
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The original
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.Nm
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manual page first appeared in
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.Fx 2.2 .
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It used a very different interface to achieve similar results.
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.Pp
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The current incarnation of
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.Nm
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appeared in
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.Fx 5.0 .
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.Sh AUTHORS
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This manual page was written by
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.An Gordon Tetlow Aq gordon@FreeBSD.org .
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.Sh BUGS
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The nextboot code is implemented in the loader. It is not the most throughly
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tested code. It is also my first attempt to write in Forth.
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.Pp
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Finally, it does some evil things like writing to the filesystem before it
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has been checked. If it scrambles your filesystem, don't blame me.
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