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DENNIS RITCHIE (STANDING) AND KEN THOMPSON BEGIN PORTING UNIX TO THE
PDP-11 VIA TWO TELETYPE 33 TERMINALS.
I think it's impossible to provide an exact definition of Unix [1].
In summary, Unix is a family of operating systems, comprised of
various kernels and suites of basic utilities, and encompassing a
philosophy of programming and using computers that has resulted in the
Unices of today.
The first versions were implemented at BellLabs [2] for a PDP-7 [3]
in 1969. Today, the trademark _Unix_ is owned by X/Open, and is
licensed to anyone whose system can pass a set of compliance tests.
Unix [4] is sometimes called *NIX because at one time AT&T were
pretty fascist about protecting the trademark, which they then owned.
For more details, see this paper [5] or the corporate glossy [6] at
BellLabs [7].
Links:
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[1] http://melbournewireless.org.au/?Unix
[2] http://melbournewireless.org.au/?BellLabs
[3] http://melbournewireless.org.au/?PDP-7
[4] http://melbournewireless.org.au/?Unix
[5] http://cm.bell-labs.com/cm/cs/who/dmr/hist.html
[6] http://www.bell-labs.com/history/unix/
[7] http://melbournewireless.org.au/?BellLabs
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