From: "David" <nobody AT bogus DOT com>
Newsgroups: comp.os.msdos.djgpp
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Subject: Re: DJGPP port of WHICH
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Date: Thu, 24 Aug 2000 08:25:00 -0400
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To: djgpp AT delorie DOT com
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Reply-To: djgpp AT delorie DOT com

Hans-Bernhard Broeker <broeker AT physik DOT rwth-aachen DOT de> wrote in message
news:8o2l25$5rr$1 AT nets3 DOT rz DOT RWTH-Aachen DOT DE...
> David <nobody AT bogus DOT org> wrote:
> > I played around with the __dosexec_find_on_path function, but it
> > would require major changes to the original "which.c" source code
> > to support the "-a" switch.
>
> Traditional Unix 'which' does not have a '-a' option, neither in the
> csh builtin of that name, nor in the standalone tool. To get the
> effect of 'which -a' on Unix, you're supposed to use another command,
> called 'where'. The only case where 'which -a' exists is if you alias
> 'which' by 'type -p' in a Bourne-style shell, or (maybe, didn't check)
> in GNU which.
>

Unfortunately, ftp://prep.ai.mit.edu/pub/gnu/ only has the sources for
which, so that's what I modified.

> > The "-a" switch is the reason I wanted to use "which" to begin with,
> > as I have 3 different versions of grep on my system, and I like to
> > be able to check which one I will be calling.
>
> You don't need '-a' to do that. 'which grep' will tell you exactly the
> version of grep you'll be using, and nothing else. That's how the tool
> came to its name. 'which -a' is for when you want to know what
> alternative versions of a command there are.

What I really wanted to was find all the versions of various utilities with
identical names (like grep, masm, cl, gcc, etc.) on my machine and find how
I needed to change my path to call the right one.