On Mon, 27 Jun 2016, Joerg Schilling wrote:

> Steve Nickolas <usotsuki at buric.co> wrote:
>
>> I tried a couple times to figure out how to implement a Bourne shell, and
>> just couldn't figure it out.  But then, I was never much of a programmer.
>
> It is hard and you cannot do it from just reading the POSIX standard.
>
> This is because the POSIX standard tries to write descriptions in an abstract
> notation that missleads people that did never see a working implementation
> before.
>
> After a few years of maintaining the Bourne Shell, I would know how to do it but
> I am not interested to do it from scratch.
>
> Jörg
>
>

Eh.  I had a specific reason for doing it that most people would find 
idiotic - I was using OSes (DOS - mainly on a Tandy 1000, which in no way 
could ever hope to handle DJGPP - and Win32) that weren't remotely POSIX 
and I wanted to make them feel more Unixy without outright *emulating 
Unix*.

-uso.