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From: ib AT wupperonline DOT de (Ingo Brueckl)
Date: Tue, 03 Jan 2006 23:39:00 +0100
Subject: Re: COMSPEC environment variable missing
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An observation which should help.

See http://www.cygwin.com/ml/cygwin/2005-12/msg01037.html for the problem. As
said, COMSPEC is set:

  TMP=C:\WINDOWS\TEMP
  TEMP=C:\WINDOWS\TEMP
  PROMPT=$p$g
  winbootdir=C:\WINDOWS
  PATH=C:\WINDOWS;C:\WINDOWS\COMMAND
  COMSPEC=C:\WINDOWS\COMMAND.COM
  DIRCMD=/o:gne
  windir=C:\WINDOWS
  BLASTER=A220 I5 D1 H5 P330 T6

but missing in cygwin environment:

  !C:=C:\daten\c\cygwin
  TMP=/tmp
  TEMP=/tmp
  PROMPT=$p$g
  WINBOOTDIR=C:\WINDOWS
  PATH=/cygdrive/c/WINDOWS:/cygdrive/c/WINDOWS/COMMAND
  DIRCMD=/o:gne
  WINDIR=C:\WINDOWS
  BLASTER=A220 I5 D1 H5 P330 T6
  CMDLINE=myset
  PATH=/cygdrive/c/WINDOWS:/cygdrive/c/WINDOWS/COMMAND
  TERM=cygwin
  HOME=/home/ib

But now something odd! If I do:

  set PATH=%PATH%;DOES_NOT_MATTER

I suddenly get:

  !C:=C:\daten\c\cygwin
  TMP=/tmp
  TEMP=/tmp
  PROMPT=$p$g
  WINBOOTDIR=C:\WINDOWS
  COMSPEC=C:\WINDOWS\COMMAND.COM
  DIRCMD=/o:gne
  WINDIR=C:\WINDOWS
  BLASTER=A220 I5 D1 H5 P330 T6
  PATH=/cygdrive/c/WINDOWS:/cygdrive/c/WINDOWS/COMMAND:DOES_NOT_MATTER
  PATH=/cygdrive/c/WINDOWS:/cygdrive/c/WINDOWS/COMMAND:DOES_NOT_MATTER
  TERM=cygwin
  HOME=/home/ib

and COMSPEC reappers!

This only works, if setting PATH, no other environment variable change (or
setting of a new one) will cause COMSPEC to reappear.

Strange, but should help to track down this bug.

Ingo


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