> It's the KORN shell on a POSIX system.

I believe the POSIX standard shell includes features of the korn shell, but
the two are not the same thing.  For interactive use you can probably get
away with pretending that they are though.  For development purposes where
you're writing code that must run on machines you've never seen before, then
you might want to be more cautious.

I'm not convinced that the standards stuff is all that important for Unix in
the long run, at least not if you write your applications in a careful,
layered, and minimalist, fashion.  Many of the commercial Unix products are
actually adding Linux compatibility layers now to ease porting of all the
available Linux code to their proprietary platforms, so I'm not sure which
is going to turn out to be the more robust standard, "POSIX" or "Linux".

It's a shock to have to go back to HP-UX from Linux these days because most
of the tools one takes for granted on Linux just aren't there out-of-the-box
on HP-UX and have to be acquired, possibly built, and installed as needed.
Having a full Linux install is cool because chances are if you read about
some nifty tool somewhere, you'll find that you already have it fully
installed and ready to go.

G.

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