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delay.4th(8) [freebsd man page]

DELAY.4TH(8)						    BSD System Manager's Manual 					      DELAY.4TH(8)

delay.4th -- FreeBSD debugging boot module DESCRIPTION
The file that goes by the name of delay.4th is a set of commands designed to add debugging capabilities to loader(8). The commands of delay.4th by themselves are not enough for most uses. Please refer to the examples below for the most common situations, and to loader(8) for additional commands. Before using any of the commands provided in delay.4th, it must be included through the command: include delay.4th This line is present in /boot/beastie.4th file, so it is not needed (and should not be re-issued) in a normal setup. The commands provided by it are: delay_execute Executes the [string] procedure stored in the delay_command environment variable after loader_delay seconds. If the optional delay_showdots environment variable is set, a continuous series of dots is printed. During the duration, the user can either press Ctrl-C (or Esc) to abort or ENTER to proceed immediately. The environment variables that effect its behavior are: delay_command The command to be executed by delay_execute. loader_delay The duration (in seconds) to delay before executing delay_command. delay_showdots If set, will cause delay_execute to print a continuous series of dots during the delay duration. FILES
/boot/loader The loader(8). /boot/delay.4th delay.4th itself. /boot/loader.rc loader(8) bootstrapping script. EXAMPLES
Introducing a 5-second delay before including another file from /boot/loader.rc: include /boot/delay.4th set delay_command="include /boot/other.4th" set delay_showdots set loader_delay=5 delay_execute SEE ALSO
loader.conf(5), beastie.4th(8), loader(8), loader.4th(8) HISTORY
The delay.4th set of commands first appeared in FreeBSD 9.0. AUTHORS
The delay.4th set of commands was written by Devin Teske <>. BSD
May 18, 2011 BSD

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

nextboot -- specify an alternate kernel and boot flags for the next reboot SYNOPSIS
nextboot [-e variable=value] [-f] [-k kernel] [-o options] nextboot -D DESCRIPTION
The nextboot utility allows specifying some combination of an alternate kernel, boot flags and kernel environment 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. -e variable=value This option adds the provided variable and value to the kernel environment. The value is quoted when written to the nextboot configuration. -f This option disables the sanity checking which checks if the kernel really exists before writing the nextboot configuration. -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 configuration 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 <>. BUGS
The nextboot code is implemented in the loader(8). It is not the most thoroughly 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
January 31, 2012 BSD

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