LOADER.4TH(7) Standards, Environments, and Macros LOADER.4TH(7)


loader.4th - loader.conf processing tools


The file that goes by the name of loader.4th is a set of commands designed
to manipulate loader.conf(5) files. The default /boot/loader.rc includes
loader.4th and uses one of its commands to automatically read and process
the standard loader.conf(5) files. Other commands exists to help the user
specify alternate configurations.

The commands of loader.4th by themselves are not enough for most uses.
Please refer to the examples below for the most common situations, and to
loader(7) for additional commands.

Before using any of the commands provided in loader.4th, it must be
included through the command:

include loader.4th

This line is present in the default /boot/loader.rc file, so it is not
needed (and should not be re-issued) in a normal setup.

The commands provided by it are:
boot kernelname [...]
boot directory [...]
boot -flag ... Boot as specified by the loader.conf(5) files

Depending on the arguments passed, it can
override boot flags and either the kernel name
or the search path for kernel and modules.

boot-conf kernelname [...]
boot-conf directory [...]
boot-conf -flag ... Works like boot described above, but instead
of booting immediately, uses autoboot, so it
can be stopped.

start Reads /boot/defaults/loader.conf, all other
loader.conf(5) files specified in it, then
loads the desired kernel and modules (if not
already loaded). After which you can use the
boot or autoboot commands or simply exit
(provided autoboot_delay is not set to NO) to
boot the system. start is the command used in
the default /boot/loader.rc file (see

initialize Initialize the support library so commands can
be used without executing start first. Like
start, it reads /boot/defaults/loader.conf and
all other loader.conf(5) files specified in it
(but does not load kernel or modules).
Returns a flag on the stack to indicate if any
configuration files were successfully loaded.

read-conf filename Reads and processes a loader.conf(5) file.
Does not proceed to boot.

enable-module module Enables the loading of module.

disable-module module Disables the loading of module.

toggle-module module Toggles the loading of module on and off.

show-module module Shows the information gathered in the
loader.conf(5) files about the module module.

show-module-options Shows all modules defined in current
loader.conf(5) configuration.

retry Used inside loader.conf(5) files to specify
the action after a module loading fails.

ignore Used inside loader.conf(5) files to specify
the action after a module loading fails.
try-include file [file ...]
Process script files if they exist. Each
file, in turn, is completely read into memory,
and then each of its lines is passed to the
command line interpreter. If any error is
returned by the interpreter, the try-include
command aborts immediately, without reading
any other files, and silently returns without


/boot/loader The loader(7).
/boot/forth/loader.4th loader.4th itself.
/boot/loader.rc loader(7) bootstrapping script.
File loaded by the start command.


Standard /boot/loader.rc:

include /boot/forth/loader.4th

Read an additional configuration file and then proceed to boot:

read-conf /boot/special.conf


loader.conf(5), loader(7)

illumos April 22, 2017 illumos