Compaq AlphaServer DS20E Reference Manual page 85

4.1.4 boot_osflags
The boot_osflags environment variable sets the default boot flags and,
for OpenVMS, a root number.
Boot flags contain information used by the operating system to determine some
aspects of a system bootstrap. Under normal circumstances, you can use the
default boot flag settings.
To change the boot flags for the current boot only, use the flags_value argument
with the boot command.
The syntax is:
set boot_osflags flags_value
The flags_value argument is specific to the operating system.
Tru64 UNIX Systems
Tru64 UNIX systems take a single ASCII character as the flags_value
argument.
Load operating system software from the specified boot device
a
(autoboot). Boot to multiuser mode.
Prompt for the name of a file to load and other options (boot
i
interactively). Boot to single-user mode.
Stop in single-user mode. Boots /vmunix to single-user mode and stops
s
at the # (root) prompt.
D Full dump; implies "s" as well. By default, if Tru64 UNIX crashes, it
completes a partial memory dump. Specifying "D" forces a full dump at
system crash.
Example
The following setting will autoboot Tru64 UNIX to multiuser mode when you
enter the boot command.
P00>>> set boot_osflags a
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Booting and Installing an Operating System 4-7