Compaq AlphaServer 1200 User Manual page 45

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The show boot* command lists all environment variables that begin with the
string "boot." In this example, the bootdef_dev environment variable sets the
default boot device to dkb0.0.0.5.1, and boot_osflags indicates that the system
will autoboot to multiuser mode. See Section 4.18 for descriptions of these
environment variables.
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The boot command needs no options, since the environment variables pass all
necessary information.
The boot command accepts the name of a boot device, a boot file name
through the -file option, and boot flags through the -flags option. The
environment variables bootdef_dev, boot_file, and boot_osflags can also be
used to specify the default boot device or device list, the default boot file, and
flag information. When an option and the corresponding environment variable
are both in a command string, the option overrides the environment variable.
The value of the environment variable, however, is not changed. See Section
4.18 for information about environment variables.
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