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TECO 音标拼音: [t'iko] /tee'koh/ (Originally an acronym for "[paper]
Tape Editor and COrrector"; later, "Text Editor and
COrrector"]) 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. The first {Emacs} editor
was written in TECO.
It was noted for its powerful programming-language-like
features and its unspeakably {hairy} {syntax} (see {write-only
language}). TECO programs are said to resemble {line noise}.
Every string of characters is a valid TECO program (though
probably not a useful one); one common game used to be predict
what the TECO commands corresponding to human names did.
As an example of TECO's obscurity, here is a TECO program that
takes a list of names such as:
Loser, J. Random
Quux, The Great
Dick, Moby
sorts them alphabetically according to surname, and then puts
the surname last, removing the comma, to produce the
following:
Moby Dick
J. Random Loser
The Great Quux
The program is
[1 J^P$L$$
J <.-Z; .,(S,$ -D .)FX1 @F^B $K :L I $ G1 L>$$
(where ^B means "Control-B" (ASCII 0000010) and $ is actually
an {alt} or escape (ASCII 0011011) character).
In fact, this very program was used to produce the second,
sorted list from the first list. The first hack at it had a
{bug}: GLS (the author) had accidentally omitted the "@" in
front of "F^B", which as anyone can see is clearly the {Wrong
Thing}. It worked fine the second time. There is no space to
describe all the features of TECO, but "^P" means "sort" and
"J<.-Z; ... L>" is an idiomatic series of commands for "do
once for every line".
By 1991, {Emacs} had replaced TECO in hacker's affections but
descendants of an early (and somewhat lobotomised) version
adopted by {DEC} can still be found lurking on {VMS} and a
couple of {crufty} {PDP-11} {operating systems}, and ports of
the more advanced MIT versions remain the focus of some
antiquarian interest.
See also {retrocomputing}.
{(ftp://usc.edu/)} for {VAX}/{VMS}, {Unix}, {MS-DOS},
{Macintosh}, {Amiga}.
[Authro? Home page?]
(2001-03-26)
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