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NEXTBOOT(8)               BSD System Manager's Manual              NEXTBOOT(8)

NAME
     nextboot -- specify an alternate kernel and boot flags for the next
     reboot

SYNOPSIS
     nextboot [-f] [-o options] -k kernel
     nextboot -D

DESCRIPTION
     The nextboot utility allows specifying an alternate kernel and/or boot
     flags for the next time the machine is booted.  Once the loader(8) loads
     in the new kernel information, it is deleted so in case the new kernel
     hangs the machine, once it is rebooted, the machine will automatically
     revert to its previous configuration.

     The options are as follows:

     -D          Invoking nextboot with this option removes an existing
                 nextboot configuration.

     -f          This option disables the sanity checking which checks if the
                 kernel really exists before writing the nextboot configura-
                 tion.

     -k kernel   This option specifies a kernel directory relative to /boot to
                 load the kernel and any modules from.

     -o options  This option allows the passing of kernel flags for the next
                 boot.

FILES
     /boot/nextboot.conf  The configuration file that the nextboot configura-
                          tion is written into.

EXAMPLES
     To boot the GENERIC kernel with the nextboot command:

           nextboot -k GENERIC

     To enable into single user mode with the normal kernel:

           nextboot -o "-s" -k kernel

     To remove an existing nextboot configuration:

           nextboot -D

SEE ALSO
     boot(8), loader(8)

HISTORY
     The original nextboot manual page first appeared in FreeBSD 2.2.  It used
     a very different interface to achieve similar results.

     The current incarnation of nextboot appeared in FreeBSD 5.0.

AUTHORS
     This manual page was written by Gordon Tetlow <gordonATFreeBSD.org>.

BUGS
     The nextboot code is implemented in the loader(8).  It is not the most
     throughly tested code.  It is also my first attempt to write in Forth.

     Finally, it does some evil things like writing to the file system before
     it has been checked.  If it scrambles your file system, do not blame me.

BSD                            November 4, 2002                            BSD