loader.4th man page on FreeBSD

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

     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(8) 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 read.

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

	   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, and
				  then proceeds to boot as specified in them.
				  This is the command used in the default
				  /boot/loader.rc file, and it uses the
				  autoboot command (see loader(8)), so it can
				  be stopped for further interaction with

	   initialize		  Initialize the supporting library so com‐
				  mands can be used without executing start
				  first.  Like start, reads
				  /boot/defaults/loader.conf and all other
				  loader.conf(5) files specified in it.
				  Returns a flag on the stack to indicate if
				  any configuration file was successfully

	   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

	   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.

     /boot/loader      The loader(8).
     /boot/loader.4th  loader.4th itself.
     /boot/loader.rc   loader(8) bootstrapping script.
		       File loaded by the start command.

     Standard /boot/loader.rc:

	   include /boot/loader.4th

     Load a different kernel with the standard configuration:

	   set kernel="kernel.old"

     Read an additional configuration file and then proceed to boot:

	   read-conf /boot/special.conf

     Disable the loading of the splash screen module and bitmap and then pro‐
     ceed to boot:

	   disable-module splash_bmp
	   disable-module bitmap

     loader.conf(5), loader(8)

     The loader.4th set of commands first appeared in FreeBSD 3.2.

     The loader.4th set of commands was written by Daniel C. Sobral

     A British espionage series.

BSD			      September 30, 2004			   BSD

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