Before I attempt to use an environment variable in a DOS batch script I would like to test it to ensure it exist. How do you test an environment variable to ensure it was created?

Try this:

--------------------
@echo off
if "%var%"=="" then goto novar
echo Variable VAR does not exist
goto end
:novar
echo Variable VAR = %var%
:end
--------------------

Thanks for the post!

May I ask a follow up question?

How do I say:

if "%var%" NOT == "" (
:: do something here...
)

obvious the statement above isn't working...

thanks!

If not "%var%"=="" Do something here...

By the way if you are coding to execute in a console window under XP, you can use more powerfull statements in your batch as in XP there is no DOS an what you see at prompt is actually an emulator, the NTVDM (NT Virtual DOS Machine).

So your previous test in XP is coded as

If not defined var ( Do something here...)

where the ( ) enable to code more than one statement.

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