"Al Dunbar [MS-MVP]" <alan-no-drub-(E-Mail Removed)> wrote in message
news:(E-Mail Removed)...
>
> "Kok Yong Lee" <(E-Mail Removed)> wrote in message
> news:%(E-Mail Removed)...
> > Thanks Mark
> >
> > However, with the new IF DEFINED loop, I find it the batch script behave
> > differently. For example, in the code snippet below, if I detected env
> > variable asm_main_location is set, I will call another batch file to set
> > some env varible then use the env varible to create a folder.
> >
> > With the IF DEFINED loop, for some reason the %ASMFULL% env variable
dont
> > get recognise and hence no folder is created, but at the end of the
batch
> > script I can clear see that %ASMFULL% is set via SET ASMFULL.
> >
> > And if I comment out the IF DEFINED loop, then the batch script will go
> > ahead and create a new folder based on the ASMFULL value.
> >
> > any ideas what may have been wrong with my script?
>
> just before the call r:\build\version.bat /o command is executed, ALL of
the
> variables up to the matching ")" are expanded. You may change their
values,
> either directly or indirectly via a call to another batch. What you need
to
> do is replace those "%" signs with "!", and add the following command at
the
> top of the batch file:
Oooops, typo alert. I meant to say above "... via a call to another batch,
but you will not be able to display those new values from within the "( )"
block.
/Al
> setlocal enabledelayedexpansion
>
> /Al
>
>
> > set asm_main_location=blah
> > echo [Setting 3rd Party Environment]
> > if DEFINED asm_main_location (
> > call R:\build\versions.bat /o
> > if not exist %_INV_3RD_PARTY_LOCALDIR%\ASM\%ASMFULL% (
> > mkdir %_INV_3RD_PARTY_LOCALDIR%\ASM\%ASMFULL%
> > ) else (
> > echo Folder %_INV_3RD_PARTY_LOCALDIR%\ASM\%ASMFULL% existed already
> > )
> > )
> > echo [Finish Setting Environment]
> >
> >
> >
> >
> >
> > "Mark V" <(E-Mail Removed)> wrote in message
> > news:(E-Mail Removed)...
> > > In microsoft.public.win2000.cmdprompt.admin Kok Yong Lee wrote:
> > >
> > >> Hi there,
> > >>
> > >> Would like to know what is the best way to determine whether an
> > >> environment variable has been set in a batch file. I dont care
> > >> about its value just wanted to know whetehr user has previously
> > >> set it.
> > >>
> > >> thanks in advanced
> > >
> > > IF /?
> > >
> > > "The DEFINED conditional works just like EXISTS except it takes an
> > > environment variable name and returns true if the environment
> > > variable is defined." (W2K)
> >
> >
>
>
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