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From: Brian Inglis <Brian DOT Inglis AT SystematicSw DOT ab DOT ca>
Subject: Re: too many environment variables on self-compiled xar archiver
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Date: Thu, 25 May 2017 11:34:55 -0600
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On 2017-05-24 15:18, Hans-Bernhard Bröker wrote:
> Am 24.05.2017 um 12:01 schrieb Andrey Repin:
> 
>>> Did you notice this entry and does anyone know where this comes from?
>>>          !C:=C:\cygwin\bin
> 
>> This is coming from CMD, and denotes current working directory on an
>> indicated
>> drive.
> 
> And for (most of) all the hairy details, see
> 
> https://blogs.msdn.microsoft.com/oldnewthing/20100506-00/?p=14133
> 
> If you see these, you must have printed the environment using a tool
> other than CMD itself (e.g. Cygwin's "env").

Or as comment
https://blogs.msdn.microsoft.com/oldnewthing/20100506-00/?p=14133#comment-830913
says, in cmd type
	set "
to see all environment variables including those starting with "=".

So the above is Cygwin "cleaning" the inherited cmd environment which
contains =<d>:=<d>:\<wd> for each mapped drive, and some other legacy
compatible information, by changing the leading "=" to "!", so it can
restore it for child process environments.

-- 
Take care. Thanks, Brian Inglis, Calgary, Alberta, Canada

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