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	Sat, 05 Dec 2020 06:24:39 -0800 (PST)
To:	cygwin AT cygwin DOT com
Subject:	Environment variable named !:: (exclamation mark + colon + colon)
Message-ID:	<552a04ab-86a3-ef03-1c9e-c4d17aff1cd9@gmail.com>
Date:	Sat, 5 Dec 2020 23:24:36 +0900
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From:	tzccinct via Cygwin <cygwin AT cygwin DOT com>
Reply-To:	tzccinct <tzccinct AT gmail DOT com>
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Hi,

I have found an environment variable that has a strange name `!::' 
(exclamation mark + colon + colon) on my terminal (both mintty and Tera 
Term). The value is also strange, `::\' (colon + colon + backslash).

$ env | sort | head -n 3
!::=::\
_=/usr/bin/env
ALLUSERSPROFILE=C:\ProgramData

Is this an expected environment variable on Cygwin? If so, what is this for?

Best regards,
tzccinct
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