[Info-vax] Anyone interested in another public access system

[sapienzaf]

On Apr 11, 7:33 pm, Michael Kraemer <M.Krae... at gsi.de> wrote:
> sapienzaf schrieb:
>
> > b) What it tells me is that there have been (and are) many variations
> > in how Unix and its derivatives are being implemented, and somebody
> > was trying to make sense of it all by creating a set of standards that
> > they should strive to meet.  The goal of POSIX was to allow
> > portability of applications from one Unix variant to another.  It has
> > failed in that goal,
>
> Why that ?
> Even before POSIX applications were much more portable between
> the various Unices than between Unix and proprietary systems.

Because there are still incompatibilities between the Unix variants,
Because some Unix variants may never be (nor attempt to be) POSIX
compliant.  And because POSIX has been superceded.  Twice.  First by
Spec 1170, then by SUS (the Single Unix Specification).

The various Unix variants (or Unix-like operating systems) may have
achieved hardware vendor independence, but there's still an issue of
software vendor independence.  Develop an application for GNU/Linux
and it might not run on AIX (depending on which non-compliant features
of GNU/Linux are being used).  Similarly, develop an application for
GNU/Linux and it might not run on OpenBSD.