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From: Chris Faylor <cgf AT cygnus DOT com>
Date: Tue, 17 Oct 2000 11:29:21 -0400
To: "'cygwin AT sources DOT redhat DOT com'" <cygwin AT sources DOT redhat DOT com>
Subject: Re: Treatment of x:path again
Message-ID: <20001017112921.C9406@cygnus.com>
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References: <E60D7CECFA41804CBA65ABD8AA1666B0730393 AT red-msg-07 DOT redmond DOT corp DOT microsoft DOT com>
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In-Reply-To: <E60D7CECFA41804CBA65ABD8AA1666B0730393@red-msg-07.redmond.corp.microsoft.com>; from smueller@microsoft.com on Mon, Oct 16, 2000 at 06:45:20PM -0700

On Mon, Oct 16, 2000 at 06:45:20PM -0700, Stephan Mueller wrote:
>While it's true that you can ask cmd.exe for the current directory by
>using something like echo %CD%, note that this is a pseudo-variable at
>best.  It's not found in older versions of cmd.exe (NT4SP3 or
>thereabouts being required as a minimum) and it's clearly not a real
>variable: set without arguments won't list it, and set cd=asdf will
>simply set a real variable to the value asdf, and will have no effect
>on your current directory.

The behavior I'm referring to has been around since NT 3.5, at least.
cmd.exe stores something like:

=D:=D:\FOO

in the environment.

It is a "real" environment variable in that it is retrievable via
GetEnvironmentVariable but it is odd in that the variable name begins
with '='.  You also don't see this when you type 'set'.

cgf

>Or are you referring to something else?
>
>stephan();
>
>
>-----Original Message-----
>From: Chris Faylor [mailto:cgf AT cygnus DOT com]
>Sent: Monday, October 16, 2000 6:37 PM
>To: cygwin AT sources DOT redhat DOT com
>Subject: Re: Treatment of x:path again
>
>
>On Tue, Oct 17, 2000 at 03:31:19AM +0200, Lassi A. Tuura wrote:
>>|> How would you suggest having something be 'relative to the current path'
>>|> in cygwin, given the /cygdrive method of doing things?  cygwin has never
>>|> kept track of the current directory of other drives.
>>
>>FWIW, it seems this isn't even possible under Win32.  Based on MSDN docs
>>it sounds like Win32 maintains only one current directory and really
>>knows nothing about disk drives in that context.  It is only cmd.exe
>>that maintains an illusion of a current directory for all the drives on
>>Windows NT and 2000. 
>
>NT stores the current directory in environment variables, actually.  Windows
>9x
>seems to store the information at the OS level.
>
>cgf
>
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