Setting And Viewing Environment Variables - Compaq AlphaServer DS20E Reference Manual

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7.23 Setting and Viewing Environment Variables

Use the set envar and show envar commands to set and view
environment variables.
Example 7–25 Set envar and Show envar
P00>>> set bootdef_dev dkb0
P00>>> show bootdef_dev
Bootdef_dev dkb0
Environment variables pass configuration information between the console and
the operating system. Their settings determine how the system powers up,
boots the operating system, and operates. Environment variables are set or
changed with the set envar command. Their values are viewed with the show
envar command. You can also create nonvolatile environment variables with
the edit command, as shown in Example 7–26.
Example 7–26 User-Created Environment Variable
P00>>> edit nvram
editing 'nvram'
0 bytes read in
*10 set mopv3_boot 1
*exit
17 bytes written out to nvram
P00>>>
In this example the nvram script is edited so that an environment variable
called mop3_boot is created and set to 1 on each power-up. By default, MOP
boots send four MOP V4 requests before defaulting to MOP V3. This user-
created environment variable forces the SRM console to bypass MOP V4
requests. This speeds up MOP booting on networks with MOP V3 software.
7-52 DS20E Reference Guide