flavours of shell - what is there?

[kpc]

In article <7885 at star.cs.vu.nl> gpvos at cs.vu.nl (=Vos G P) writes:

   It may be ditributed outside the VU, but i know of no ftp site or
...
   compatible (in fact, the sources are derived from the sh sources),

How are these deals struck?  Or does AT&T not mind?  Is ksh based on
sh also?  Is sh source free?  Does AT&T not own sh copyrights?  What
about places like Berkeley?

These are just questions.  They are not pro- or anti- FSF/GPV flames
of any kind!

Thanks.
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