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Lexikon

TECO

/tee' koh/ (Originally an acronym for "[paper] Tape Editor and COrrector" later, "Text Editor and COrrector"]) A href="module.php?name=Lexikon&file=search&eid=1&query=text editor">text editor developed at href="module.php?name=Lexikon&file=search&eid=1&query=MIT">MIT and modified by just about everybody. With all the dialects included, TECO may have been the most prolific editor in use before href="module.php?name=Lexikon&file=search&eid=1&query=Emacs">Emacs, to which it was directly ancestral. The first href="module.php?name=Lexikon&file=search&eid=1&query=Emacs">Emacs editor was written in TECO. It was noted for its powerful programming-language-like features and its unspeakably href="module.php?name=Lexikon&file=search&eid=1&query=hairy">hairy href="module.php?name=Lexikon&file=search&eid=1&query=syntax">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 href="module.php?name=Lexikon&file=search&eid=1&query=alt">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 href="module.php?name=Lexikon&file=search&eid=1&query=bug">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, href="module.php?name=Lexikon&file=search&eid=1&query=Emacs">Emacs had replaced TECO in hacker' s affections but descendants of an early (and somewhat lobotomised) version adopted by href="module.php?name=Lexikon&file=search&eid=1&query=DEC">DEC can still be found lurking on href="module.php?name=Lexikon&file=search&eid=1&query=VMS">VMS and a couple of crufty href="module.php?name=Lexikon&file=search&eid=1&query=PDP-11">PDP-11 href="module.php?name=Lexikon&file=search&eid=1&query=operating systems">operating systems, and ports of the more advanced MIT versions remain the focus of some antiquarian interest. See also href="module.php?name=Lexikon&file=search&eid=1&query=retrocomputing">retrocomputing. href="ftp://usc.edu/"> for href="module.php?name=Lexikon&file=search&eid=1&query=VAX">VAX/href="module.php?name=Lexikon&file=search&eid=1&query=VMS">VMS, href="module.php?name=Lexikon&file=search&eid=1&query=Unix">Unix, href="module.php?name=Lexikon&file=search&eid=1&query=MS-DOS">MS-DOS, href="module.php?name=Lexikon&file=search&eid=1&query=Macintosh">Macintosh, href="module.php?name=Lexikon&file=search&eid=1&query=Amiga">Amiga. [Authro? Start page?] (2001-03-26)

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