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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