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Date: Fri, 01 Oct 2004 21:58:18 +0200
From: "Eli Zaretskii" <eliz AT gnu DOT org>
Sender: halo1 AT zahav DOT net DOT il
To: djgpp AT delorie DOT com
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	(rafael_no_spam_no_ AT geninfor DOT com)
Subject: Re: system() return value if no program present
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> From: "=?windows-1252?Q?Rafael_Garc=EDa?=@unknown.addr"
>  <rafael_no_spam_no_ AT geninfor DOT com>
> Date: Fri, 01 Oct 2004 12:37:33 +0200
> 
> I have found the same problem in another computer and I have found that 
> this only happens when an environment variable "SHELL" is defined. If I 
> undefined it, no interactive shell is launched.
> 
> set SHELL=
>    - system("grep")=2 and works as expected
>    - system("notexist")=0 and works as expected ("not found")
>    - system("dir")=0 and works as expected
> 
> set SHELL=cmd
>    - system("grep")=2 and works as expected
>    - system("notexist")=-1 and works as expected ("not found")
>    - system("dir")=-1 and it does nothing (why?)
> 
> set SHELL=c:\wtsrv\system32\cmd.exe    (correct path)
>    - system("grep")=2 and works as expected
>    - system("notexist") runs interactive shell and then returns 0 (why?)
>      (this was what begun my question)
>    - system("dir") runs interactive shell and then returns 0 (why?)

It seems that in DJGPP v2.03, cmd.exe is not treated as a DOS shell,
so `system' thinks it is a Unix-like shell.  That's a bug, I think.

Therefore, I suggest to set SHELL to command.com, not to cmd.exe.  Do
the problems go away in that case?