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From: Brian Inglis <Brian DOT Inglis AT SystematicSW DOT Invalid>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: system() return value if no program present
Organization: Systematic Software
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Date: Fri, 01 Oct 2004 18:29:00 GMT
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To: djgpp AT delorie DOT com
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On Fri, 01 Oct 2004 12:37:33 +0200 in comp.os.msdos.djgpp, Rafael
García <rafael_no_spam_no_ AT geninfor DOT com> wrote:

>Eli Zaretskii escribió:
>>>>>When executed in my system I find myself in a new shell:
>>>>>
>>>>>Microsoft Windows XP [Versin 5.1.2600]
>>>>>(C) Copyright 1985-2001 Microsoft Corp.
>>>>>
>>>>>c:\c>
>>>>
>
>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?)

SHELL is expected to name a Unix like shell, COMSPEC is expected to
name a DOS like shell, so your first setting is correct. 

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

Brian DOT Inglis AT CSi DOT com 	(Brian[dot]Inglis{at}SystematicSW[dot]ab[dot]ca)
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