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Bourne Shell Extensions [was Re: shell scripting book]




As I found out, there are some features of all of ash, bash and zsh which
are not supported by the System Vish /bin/sh's. For instance, I noticed
that the $(sub-shell) output capture was not supported. AFAIK, $(...) was
introduced by the Korn Shell and some free Bourne shells copied it.

I am planning to give a lecture about Bourne shell programming to the
Haifa Linux Club. What I am going to do is to explain some extensions but
to clearly mention that they are not in the POSIX standard and that they
are not supported by ash and/or the System V'ish /bin/sh's.

Regards,

	Shlomi Fish



----------------------------------------------------------------------
Shlomi Fish        shlomif@t2.technion.ac.il
Home Page:         http://t2.technion.ac.il/~shlomif/
Home E-mail:       shlomif@techie.com

A more experienced programmer does not make less bugs. He just realizes
what went wrong more quickly.


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