Path: utzoo!attcan!uunet!auspex!guy
From: guy@auspex.auspex.com (Guy Harris)
Newsgroups: comp.unix.sysv386
Subject: Re: Replacement su for SCO Unix
Keywords: SCO, su
Message-ID: <4128@auspex.auspex.com>
Date: 1 Oct 90 18:33:59 GMT
References: <1990Sep21.143435.9810@dce.ie> <bashsco@dce.ie> <143@guug.guug.de>
Organization: Auspex Systems, Santa Clara
Lines: 18

>Not really stupid (i must admit to microsoft). 'shell ?' means
>'shell != 0' and *not* 'shell != NULL'. You should not rely on
>NULL being the same as 0.

...unless you're using a C compiler rather than something that pretends
to be a C compiler.  If your C compiler can't cope with

	if (shell)

and

	if (shell != 0)

and

	if (shell != NULL)

and treat them all the same, it's broken.