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TECO /tee'koh/ /n.,v. obs./ 1. [originally an acronym for `[paper]
Tape Editor and COrrector'; later, `Text Editor and COrrector'] /n./
A text editor developed at MIT and modified by just about everybody.
With all the dialects included, TECO may have been the most prolific
editor in use before EMACS, to which it was directly ancestral.
Noted for its powerful programming-language-like features and its
unspeakably hairy syntax. It is literally the case that every string
of characters is a valid TECO program (though probably not a useful
one); one common game used to be mentally working out what the TECO
commands corresponding to human names did.
In mid-1991, TECO is pretty much one with the dust of history,
having been replaced in the affections of hackerdom by EMACS.
Descendants of an early (and somewhat lobotomized) version adopted
by DEC can still be found lurking on VMS and a couple of crufty
PDP-11 operating systems, however, and ports of the more advanced
MIT versions remain the focus of some antiquarian interest.