Environment Variables; B.2 Environment Variables - Compaq AlphaServer GS60E Service Manual

B.2

Environment Variables

An environment variable is a name and value association maintained by the
console program. The value associated with an environment variable is an
ASCII string (up to 127 characters) or an integer. Some environment variables
are typically modified by the user to tailor the recovery behavior of the system
on power-up and after system failures. Volatile environment variables are
initialized by a system reset; others are nonvolatile across system failures.
Environment variables are created, modified, displayed, and deleted using the
create, set, show, and clear commands. A default value is associated with
any variable that is stored the EEPROM area.
Table B-2 lists console environment variables, their attributes, and their
functions.
Table B–2 Environment Variables
Variable Attribute
arc_enable Non-
volatile
auto_action Non-
volatile
Non-
bootdef_dev
volatile
Non-
boot_file
volatile
boot_osflags Non-
volatile
Function
Enables the console ARC interface, allowing
booting of ECU and other utilities. Default value is
off.
Specifies the action the system will take following
an error halt. Values are:
restart — Automatically restart. If restart fails,
boot the operating system.
The default device or device list from which booting
is attempted when no device name is specified by
the boot command.
The default file name used for the primary
bootstrap when no file name is specified by the
boot command, if appropriate.
Additional parameters to be passed to the system
software during booting if none are specified by the
boot command with the –flags qualifier.
Console Commands and Environment Variables B-5