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This is just a bit of history rummaging... I'd like to know how different today's grep is to the original implementation, introduced by Ken Thompson in ed. which evolved to ex, which then became vi...
I think too, that emacs was an evolution of ed (with macros)...

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Emacs was an evolution of TECO, not ed. Emacs didn't originate from the unix world but from MIT (which explains why its key bindings aren't aligned with unix, for example Ctrl+G and not Ctrl+C as the break key). –  Gilles May 1 '11 at 20:21
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Thanks Gilles.. yes, it seems to be E macs (not ed macs).. 'E' being a Stanford editor whose WYSIWYG feature had impressed Richard Stallman (RS), and the 'MACS' being the macro feature RS added to MIT's TECO.. This info came from wikipedia'a Emacs page (a page with 6 citation needed alerts in its History section... but they read well :)... –  Peter.O May 1 '11 at 21:42
    
At one time, I had a full set of printed 1971 Unix manuals, published somewhere on Usenet. They were a very interesting read, but they're long lost now (to me, at least). Oh, and Richard Stallman is rms, not RS. –  Alexios Jan 23 '12 at 8:49
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up vote 5 down vote accepted

You could look at the Manual Page Library, it has some early UNIX manuals...

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Thanks... man.cat-v.org/unix-1st/1/ed ... There is certaily a lot more to grep these days.. but the basic structure hasn't changed –  Peter.O May 1 '11 at 19:36
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