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In article <1993Jan4.160029.26833@newton.ccs.tuns.ca> macdonak@newton.ccs.tuns.ca (Kevin MacDonald) writes:

>Is there any way to display the contents of a single DOS variable?
>I know you can display all current variables by typing SET, but there
>doesn't appear to be any way to display variables individually.

In a batch file you could do something like
  echo COMSPEC is %COMSPEC%
This can be redirected.

In article <babcock.12.0@cfa.harvard.edu> babcock@cfa.harvard.edu (Robert W. Babcock) writes:
>In article <1993Jan4.160029.26833@newton.ccs.tuns.ca> macdonak@newton.ccs.tuns.ca (Kevin MacDonald) writes:
>
>>Is there any way to display the contents of a single DOS variable?
>>I know you can display all current variables by typing SET, but there
>>doesn't appear to be any way to display variables individually.
>
>In a batch file you could do something like
>  echo COMSPEC is %COMSPEC%
>This can be redirected.

Well, no, in fact, it can't.  Batch file redirection doesn't work.

While conceding that the inability to reference env vars directly from
the shell is a enormous omission on the part of the COMMAND.COM
designers (& I can already hear the 4DOSers gathering up their voices),
I have had good luck with:

	set | grep VARNAME

************************************************************************
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In article <1993Jan4.191855.9869@midway.uchicago.edu> pynq@quads.uchicago.edu (Jeremy Mathers) writes:
>>In a batch file you could do something like
>>  echo COMSPEC is %COMSPEC%
>>This can be redirected.
>
>Well, no, in fact, it can't.  Batch file redirection doesn't work.

What I meant was that you can add indirection to the command inside the BAT 
file, i.e.
   echo COMSPEC is %COMSPEC% >>%1
with suitable tests to make sure %1 is defined.

macdonak@newton.ccs.tuns.ca (Kevin MacDonald) writes:

> Is there any way to display the contents of a single DOS variable?
> I know you can display all current variables by typing SET, but there
> doesn't appear to be any way to display variables individually.
> 
> I'm trying to setup a user log for our novell server and I thought
> since the users login time and username can be stored in dos
> variables, the simplest way to accomplish what I want to do would be 
> to redirect the contents of these variables to a file... but alas
> DOS doesn't seem to want to cooperate...
> 
> Rob

You don't specify what exactly you want to do, but here's a couple
examples: (We'll assume you're after the contents of a variable named
"USER")

DOS batch file:

    echo %%USER%% > logfile
         -or-
    echo %USER% > logfile

Using one or two '%' is DOS version and command interpreter dependent -
experiment -- mostly I use the single until I find a place it barfs,
then add the other...

C (Turbo to be specific - check your library reference)

    char user_var[20];     /* whatever length...? */
    user_var = getenv("USER");

Hope this helps...

Jon

=============================================================================
                   Jon Freivald ( jaf%jaflrn@uunet.UU.NET )
	 Nothing is impossible for the man who doesn't have to do it.
		    PGP V2 public key available on request
=============================================================================

Jon Freivald <jaf@jaflrn.UUCP> writes:

>macdonak@newton.ccs.tuns.ca (Kevin MacDonald) writes:

>> Is there any way to display the contents of a single DOS variable?
>> I know you can display all current variables by typing SET, but there
>> doesn't appear to be any way to display variables individually.

Sure it does!

>DOS batch file:
>    echo %USER% > logfile

Yeah, those work, but then you have 'logfile' to deal with.  What's wrong
with this:  'SET | FIND USER'

He's not trying to copy USER to NEWUSER, or he could use:
SET NEWUSER=%USER%


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