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This chapter is from the book

Getting Help in OpenBoot

At any time, you can obtain help on the various Forth commands supported in OpenBoot by using the help command. The help commands from the ok prompt are listed in Table 3.2.

Table 3.2 OpenBoot help Commands




Displays instructions for using the help system and lists the available help categories.

help <category>

Shows help for all commands in the category. You use only the first word of the category description.

help <command>

Shows help for an individual command.

Because of the large number of commands, help is available only for commands that are used frequently.

The following example shows the help command with no arguments:

ok help

The system responds with the following:

Enter ‘help command-name’ or ‘help category-name’ for more help
(Use ONLY the first word of a category description) 
Examples: help system -or- help nvramrc
boot (Load and execute a program)
nvramrc (Store user defined commands)
system configuration variables (NVRAM variables)
command line editing
editor (nvramrc editor)
resume execution
devaliases (Device Aliases)
diag (Diagnostic commands)
ioredirect (I/O redirection commands)
misc (Miscellaneous commands)

If you want to see the help messages for all commands in the category diag, for example, you type the following:

ok help diag

The system responds with this:

test <device> Run the selftest method for specified device
test-all  Execute test for all devices with selftest method
watch-net  Monitor network connection
probe-scsi  Show attached SCSI devices

ok help misc

The system responds with this:

reset-all  Reset system (similar to a power-cycle)
power-off  Power off system
sync   Reenter operating system to sync the disks
eject-floppy Eject floppy from drive
ok help boot

The system responds with this:

boot [<device-specifier>:<device-arguments>] [boot-arguments]
boot             Default boot (values specified in NVRAM variables)
boot disk1:h     Boot from disk1 partition h
boot myunix -as  Boot from default device. Pass boot program "myunix -as"

Booting from network
boot <network-device>:[dhcp,][server-ip],[boot-filename],[client-ip],
[router-ip],[boot-retries],[tftp-retries],[subnet-mask] [boot-arguments]
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