Quoting Roland Dowdeswell (elric@imrryr.org):

> >hard to rely on it when searching for things in a $PATH variable, 
> >since csh as far as I can see sources $path instead and doesnt merge
> >$PATH into it (and you are using ksh). 
> 
> If you are using ksh, then you should be using the ksh builtin
> whence.  It does the right thing.

I know that, but assume we are running off /bin/sh and only have
a POSIX layer. Then what is correct portable way of getting something
with the same semantics as which(1) or whence in ksh?

-- 
j.