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deserves to lose => adj. Said of someone who willfully does the {Wrong Thing}; humorously, if one uses a feature known to be marginal. What is meant is that one deserves the consequences of one's losing actions. "Boy, anyone who tries to use mess-dos...
deserves to lose2 => ({ITS} fans used to say this of {UNIX}; many still do.) See also screw, chomp, bagbiter. 
desk check => n.,v. To grovel over hardcopy of source code, mentally simulating the control flow; a method of catching bugs. No longer common practice in this age of on-screen editing, fast compiles, and sophisticated debuggers --- though some mainta...
desk check2 => Compare {eyeball search}, vdiff, vgrep. 
Devil Book => n. `The Design and Implementation of the 4.3BSD UNIX Operating System', by Samuel J. Leffler, Marshall Kirk McKusick, Michael J. Karels, and John S. Quarterman (Addison-Wesley Publishers, 1989) --- the standard reference book on the int...
Devil Book2 => because the cover has a picture depicting a little devil (a visual play on daemon) in sneakers, holding a pitchfork (referring to one of the characteristic features of UNIX, the fork(2) system call). 
devo => /dee'voh/ [orig. in-house jargon at Symbolics] n. A person in a development group. See also doco and mango.
dickless workstation => n. Extremely pejorative hackerism for `diskless workstation', a class of botches including the Sun 3/50 and other machines designed exclusively to network with an expensive central disk server. These combine all the disadvanta...
dickless workstation2 => disadvantages of distributed personal computers. 
dictionary flame => [USENET] n. An attempt to sidetrack a debate away from issues by insisting on meanings for key terms that presuppose a desired conclusion or smuggle in an implicit premise. A common tactic of people who prefer argument over defini...
diddle => 1. vt. To work with or modify in a not particularly serious manner. "I diddled a copy of ADVENT so it didn't double-space all the time." "Let's diddle this piece of code and see if the problem goes away." See tweak and twiddle. 2. n. The ac...
diff => /dif/ n. 1. A change listing, especially giving differences between (and additions to) source code or documents (the term is often used in the plural `diffs'). "Send me your diffs for the Jargon File!" Compare vdiff. 2. Specifically, such a l...
digit => n. An employee of Digital Equipment Corporation. See also VAX, VMS, PDP-10, {TOPS-10}, DEChead, {double DECkers}, {field circus}.
dike => vt. To remove or disable a portion of something, as a wire from a computer or a subroutine from a program. A standard slogan is "When in doubt, dike it out". (The implication is that it is usually more effective to attack software problems by...
ding => n.,vi. 1. Synonym for feep. Usage rare among hackers, but commoner in the {Real World}. 2. `dinged' What happens when someone in authority gives you a minor bitching about something, esp. something trivial. "I was dinged for having a messy de...
dink => /dink/ n. Said of a machine that has the {bitty box} nature; a machine too small to be worth bothering with --- sometimes the system you're currently forced to work on. First heard from an MIT hacker (BADOB) working on a CP/M system with 64K,...
dinosaur => n. 1. Any hardware requiring raised flooring and special power. Used especially of old minis and mainframes, in contrast with newer microprocessor-based machines. In a famous quote from the 1988 UNIX EXPO, Bill Joy compared the mainframe ...
dinosaur pen => n. A traditional mainframe computer room complete with raised flooring, special power, its own ultra-heavy-duty air conditioning, and a side order of Halon fire extinguishers. See boa.
dinosaurs mating => n. Said to occur when yet another {big iron} merger or buyout occurs; reflects a perception by hackers that these signal another stage in the long, slow dying of the mainframe industry. In its glory days of the 1960s, it was `IBM ...
dinosaurs mating2 => Control Data, General Electric, Honeywell, NCR, RCA, and Univac. RCA and GE sold out early, and it was `IBM and the Bunch' (Burroughs, Univac, NCR, Control Data, and Honeywell) for a while. Honeywell was bought out by Bull; Burro...
dinosaurs mating3 => Unisys (in 1984 --- this was when the phrase `dinosaurs mating' was coined); and as this is written AT&T is attempting to recover from a disastrously bad first 6 years in the hardware industry by absorbing NCR. More such earth-sh...
dirty power => n. Electrical mains voltage that is unfriendly to the delicate innards of computers. Spikes, drop-outs, average voltage significantly higher or lower than nominal, or just plain noise can all cause problems of varying subtlety and seve...
Discordianism => /dis-kor'di-*n-ism/ n. The veneration of Eris, a.k.a. Discordia; widely popular among hackers. Discordianism was popularized by Robert Anton Wilson's `Illuminatus!' trilogy as a sort of self-subverting Dada-Zen for Westerners --- it ...
disk farm => n. (also laundromat) A large room or rooms filled with disk drives (esp. {washing machine}s).
display hack => n. A program with the same approximate purpose as a kaleidoscope to make pretty pictures. Famous display hacks include {munching squares}, {smoking clover}, the BSD UNIX `rain(6)' program, `worms(6)' on miscellaneous UNIXes, and the X...
display hack2 => hacks can also be implemented without programming by creating text files containing numerous escape sequences for interpretation by a video terminal; one notable example displayed, on any VT100, a Christmas tree with twinkling lights...
display hack3 => The {hack value} of a display hack is proportional to the esthetic value of the images times the cleverness of the algorithm divided by the size of the code. Syn. psychedelicware. 
Dissociated Press => [play on `Associated Press'; perhaps inspired by a reference in the 1949 Bugs Bunny cartoon "What's Up, Doc?"] n. An algorithm for transforming any text into potentially humorous garbage even more efficiently than by passing it t...
Dissociated Press2 => printing any N consecutive words (or letters) in the text. Then at every step you search for any random occurrence in the original text of the last N words (or letters) already printed and then print the next word or letter. EMA...
Dissociated Press3 => Here is a short example of word-based Dissociated Press applied to an earlier version of this Jargon File wart n. A small, crocky feature that sticks out of an array (C has no checks for this). This is relatively benign and easy...
Dissociated Press4 => bent so as to be not worth paying attention to the medium in question. Here is a short example of letter-based Dissociated Press applied to the same source window sysIWYG n. A bit was named aften /bee't*/ prefer to use the other...
Dissociated Press5 => cast a chuckle on neithout getting into useful informash speech makes removing a featuring a move or usage actual abstractionsidered interj. Indeed spectace logic or problem! A hackish idle pastime is to apply letter-based Disso...
Dissociated Press6 => of text and vgrep the output in hopes of finding an interesting new word. (In the preceding example, `window sysIWYG' and `informash' show some promise.) Iterated applications of Dissociated Press usually yield better results. S...
Dissociated Press7 => `travesty generators' have been employed with considerable satirical effect to the utterances of USENET flamers; see pseudo. 
distribution => n. 1. A software source tree packaged for distribution; but see kit. 2. A vague term encompassing mailing lists and USENET newsgroups (but not BBS fora); any topic-oriented message channel with multiple recipients. 3. An information-s...
do protocol => [from network protocol programming] vi. To perform an interaction with somebody or something that follows a clearly defined procedure. For example, "Let's do protocol with the check" at a restaurant means to ask for the check, calculat...
do protocol2 => collect money from everybody, generate change as necessary, and pay the bill. See protocol. 
doc => /dok/ n. Common spoken and written shorthand for `documentation'. Often used in the plural `docs' and in the construction `doc file' (documentation available on-line).
doco => /do'koh/ [orig. in-house jargon at Symbolics] n. A documentation writer. See also devo and mango.
documentation => n. The multiple kilograms of macerated, pounded, steamed, bleached, and pressed trees that accompany most modern software or hardware products (see also tree-killer). Hackers seldom read paper documentation and (too) often resist wri...
dodgy => adj. Syn. with flaky. Preferred outside the U.S.
dogcow => /dog'kow/ n. See Moof.
dogwash => /dog'wosh/ [From a quip in the `urgency' field of a very optional software change request, ca. 1982. It was something like "Urgency Wash your dog first".] 1. n. A project of minimal priority, undertaken as an escape from more serious work....
domainist => /doh-mayn'ist/ adj. 1. Said of an {{Internet address}} (as opposed to a {bang path}) because the part to the right of the `@' specifies a nested series of `domains'; for example, eric@snark.thyrsus.com specifies the machine called snark ...
Don't do that, then! => [from an old doctor's office joke about a patient with a trivial complaint] Stock response to a user complaint. "When I type control-S, the whole system comes to a halt for thirty seconds." "Don't do that, then!" (or "So don't...
dongle => /dong'gl/ n. 1. A security or copy-protection device for commercial microcomputer programs consisting of a serialized EPROM and some drivers in a D-25 connector shell, which must be connected to an I/O port of the computer while the program...
dongle-disk => /don'gl disk/ n. See dongle; a `dongle-disk' is a floppy disk with some coding that allows an application to identify it uniquely. It can therefore be used as a dongle. Also called a `key disk'.
donuts => n.obs. A collective noun for any set of memory bits. This is extremely archaic and may no longer be live jargon; it dates from the days of ferrite-core memories in which each bit was implemented by a doughnut-shaped magnetic flip-flop.
doorstop => n. Used to describe equipment that is non-functional and halfway expected to remain so, especially obsolete equipment kept around for political reasons or ostensibly as a backup. "When we get another Wyse-50 in here, that ADM 3 will turn ...
dot file => [UNIX] n. A file which is not visible to normal directory-browsing tools (on UNIX, files named with a leading dot are, by convention, not normally presented in directory listings). Many programs define one or more dot files in which start...
dot file2 => be optionally recorded; a user can customize the program's behavior by creating the appropriate file in the current or home directory. See also {rc file}. 
double bucky => adj. Using both the CTRL and META keys. "The command to burn all LEDs is double bucky F." This term originated on the Stanford extended-ASCII keyboard, and was later taken up by users of the {space-cadet keyboard} at MIT. A typical MI...
double bucky2 => {bucky bits} (control and meta shifting keys) were nice, but there weren't enough of them; you could type only 512 different characters on a Stanford keyboard. An obvious way to address this was simply to add more shifting keys, and ...
double bucky3 => keyboard with that many shifting keys is hard on touch-typists, who don't like to move their hands away from the home position on the keyboard. It was half-seriously suggested that the extra shifting keys be implemented as pedals; ty...
double bucky4 => much like playing a full pipe organ. This idea is mentioned in a parody of a very fine song by Jeffrey Moss called "Rubber Duckie", which was published in `The Sesame Street Songbook' (Simon and Schuster 1971, ISBN 671-21036-X). Thes...
double bucky5 => 1978, in celebration of the Stanford keyboard See also {meta bit}, cokebottle, and {quadruple bucky}. 
double DECkers => n. Used to describe married couples in which both partners work for Digital Equipment Corporation.
doubled sig => [USENET] n. A {sig block} that has been included twice in a USENET article or, less commonly, in an electronic mail message. An article or message with a doubled sig can be caused by improperly configured software. More often, however,...
doubled sig2 => experience in electronic communication. See BIFF, pseudo. 
down => 1. adj. Not operating. "The up escalator is down" is considered a humorous thing to say, and "The elevator is down" always means "The elevator isn't working" and never refers to what floor the elevator is on. With respect to computers, this u...
download => vt. To transfer data or (esp.) code from a larger `host' system (esp. a mainframe) over a digital comm link to a smaller `client' system, esp. a microcomputer or specialized peripheral. Oppose upload. However, note that ground-to-space co...
DP => /D-P/ n. 1. Data Processing. Listed here because, according to hackers, use of the term marks one immediately as a suit. See DPer. 2. Common abbrev for {Dissociated Press}.
DPB => /d*-pib'/ [from the PDP-10 instruction set] vt. To plop something down in the middle. Usage silly. "DPB yourself into that couch there." The connotation would be that the couch is full except for one slot just big enough for you to sit in. DPB...
DPer => /dee-pee-er/ n. Data Processor. Hackers are absolutely amazed that suits use this term self-referentially. "*Computers* process data, not people!" See DP.
dragon => n. [MIT] A program similar to a daemon, except that it is not invoked at all, but is instead used by the system to perform various secondary tasks. A typical example would be an accounting program, which keeps track of who is logged in, acc...
Dragon Book => n. The classic text `Compilers Principles, Techniques and Tools', by Alfred V. Aho, Ravi Sethi, and Jeffrey D. Ullman (Addison-Wesley 1986; ISBN 0-201-10088-6), so called because of the cover design featuring a dragon labeled `complexi...
Dragon Book2 => bearing the lance `LALR parser generator' among his other trappings. This one is more specifically known as the `Red Dragon Book' (1986); an earlier edition, sans Sethi and titled `Principles Of Compiler Design' (Alfred V. Aho and Jef...
Dragon Book3 => ISBN 0-201-00022-9), was the `Green Dragon Book' (1977). (Also `New Dragon Book', `Old Dragon Book'.) The horsed knight and the Green Dragon were warily eying each other at a distance; now the knight is typing (wearing gauntlets!) at ...
Dragon Book4 => representation of the Red Dragon's head while the rest of the beast extends back in normal space. See also {{book titles}}. 
drain => [IBM] v. Syn. for flush (sense 2). Has a connotation of finality about it; one speaks of draining a device before taking it offline.
dread high-bit disease => n. A condition endemic to PRIME (a.k.a. PR1ME) minicomputers that results in all the characters having their high (0x80) bit ON rather than OFF. This of course makes transporting files to other systems much more difficult, n...
dread high-bit disease2 => devices. It is reported that PRIME adopted the reversed-8-bit convention in order to save 25 cents per serial line per machine. This probably qualifies as one of the most cretinous design tradeoffs ever made. See {meta bit}...
dread high-bit disease3 => (including the Atari 800) have exhibited similar brain damage. 
DRECNET => /drek'net/ [from Yiddish/German `dreck', meaning dirt] n. Deliberate distortion of DECNET, a networking protocol used in the VMS community. So called because DEC helped write the Ethernet specification and then (either stupidly or as a mal...
driver => n. 1. The {main loop} of an event-processing program; the code that gets commands and dispatches them for execution. 2. [techspeak] In `device driver', code designed to handle a particular peripheral device such as a magnetic disk or tape u...
droid => n. A person (esp. a low-level bureaucrat or service-business employee) exhibiting most of the following characteristics (a) na"ive trust in the wisdom of the parent organization or `the system'; (b) a propensity to believe obvious nonsense e...
drool-proof paper => n. Documentation that has been obsessively {dumbed down}, to the point where only a cretin could bear to read it, is said to have succumbed to the `drool-proof paper syndrome' or to have been `written on drool-proof paper'. For e...
drool-proof paper2 => from Apple's LaserWriter manual "Do not expose your LaserWriter to open fire or flame." 
drop on the floor => vt. To react to an error condition by silently discarding messages or other valuable data. "The gateway ran out of memory, so it just started dropping packets on the floor." Also frequently used of faulty mail and netnews relay s...
drop on the floor2 => {black hole}, {bit bucket}. 
drop-ins => [prob. by analogy with drop-outs] n. Spurious characters appearing on a terminal or console as a result of line noise or a system malfunction of some sort. Esp. used when these are interspersed with one's own typed input. Compare drop-out...
drop-outs => n. 1. A variety of `power glitch' (see glitch); momentary 0 voltage on the electrical mains. 2. Missing characters in typed input due to software malfunction or system saturation (this can happen under UNIX when a bad connection to a mod...
drugged => adj. (also `on drugs') 1. Conspicuously stupid, heading toward brain-damaged. Often accompanied by a pantomime of toking a joint (but see appendix B). 2. Of hardware, very slow relative to normal performance.
drunk mouse syndrome => n. A malady exhibited by the mouse pointing device of some computers. The typical symptom is for the mouse cursor on the screen to move in random directions and not in sync with the motion of the actual mouse. Can usually be c...
drunk mouse syndrome2 => and plugging it back again. Another recommended fix for optical mice is to rotate your mouse pad 90 degrees. At Xerox PARC in the 1970s, most people kept a can of copier cleaner (isopropyl alcohol) at their desks. When the st...
drunk mouse syndrome3 => up enough cruft to be unreliable, the mouse was doused in cleaner, which restored it for a while. However, this operation left a fine residue that accelerated the accumulation of cruft, so the dousings became more and more fr...
drunk mouse syndrome4 => declared `alcoholic' and sent to the clinic to be dried out in a CFC ultrasonic bath. 
dumbass attack => /duhm'as *-tak'/ [Purdue] n. Notional cause of a novice's mistake made by the experienced, especially one made while running as root under UNIX, e.g., typing `rm -r *' or `mkfs' on a mounted file system. Compare adger.
dumbed down => adj. Simplified, with a strong connotation of *over*simplified. Often, a marketroid will insist that the interfaces and documentation of software be dumbed down after the designer has burned untold gallons of midnight oil making it sma...
dump => n. 1. An undigested and voluminous mass of information about a problem or the state of a system, especially one routed to the slowest available output device (compare {core dump}), and most especially one consisting of hex or octal runes desc...
dup killer => /d[y]oop kill'r/ [FidoNet] n. Software that is supposed to detect and delete duplicates of a message that may have reached the FidoNet system via different routes.
dup loop => /d[y]oop loop/ (also `dupe loop') [FidoNet] n. An incorrectly configured system or network gateway may propagate duplicate messages on one or more echoes, with different identification information that renders {dup killer}s ineffective. I...
dup loop2 => eventually reaches a system through which it has already passed (with the original identification information), all systems passed on the way back to that system are said to be involved in a {dup loop}. 
dusty deck => n. Old software (especially applications) which one is obliged to remain compatible with (or to maintain). The term implies that the software in question is a holdover from card-punch days. Used esp. when referring to old scientific and...
dusty deck2 => of which was written in FORTRAN and very poorly documented but is believed to be too expensive to replace. See fossil. 
DWIM => /dwim/ [acronym, `Do What I Mean'] 1. adj. Able to guess, sometimes even correctly, the result intended when bogus input was provided. 2. n.,obs. The BBNLISP/INTERLISP function that attempted to accomplish this feat by correcting many of the ...
dynner => /din'r/ 32 bits, by analogy with nybble and {byte}. Usage rare and extremely silly. See also playte, tayste, crumb.*earthquake [IBM] n. The ultimate real-world shock test for computer hardware. Hackish sources at IBM deny the rumor that the...
Easter egg => n. 1. A message hidden in the object code of a program as a joke, intended to be found by persons disassembling or browsing the code. 2. A message, graphic, or sound effect emitted by a program (or, on a PC, the BIOS ROM) in response to...
Easter egg2 => or keystrokes, intended as a joke or to display program credits. One well-known early Easter egg found in a couple of OSes caused them to respond to the command `make love' with `not war?'. Many personal computers have much more elabor...
Easter egg3 => lists of the developers' names, political exhortations, snatches of music, and (in one case) graphics images of the entire development team. 
Easter egging => [IBM] n. The act of replacing unrelated parts more or less at random in hopes that a malfunction will go away. Hackers consider this the normal operating mode of {field circus} techs and do not love them for it. Compare {shotgun debu...
eat flaming death => imp. A construction popularized among hackers by the infamous {CPU Wars} comic; supposed to derive from a famously turgid line in a WWII-era anti-Nazi propaganda comic that ran "Eat flaming death, non-Aryan mongrels!" or somethin...
eat flaming death2 => reported that the Firesign Theater's 1975 album "In The Next World, You're On Your Own" included the phrase "Eat flaming death, fascist media pigs"; this may have been an influence). Used in humorously overblown expressions of h...
EBCDIC => /eb's*-dik/, /eb'see`dik/, or /eb'k*-dik/ [acronym, Extended Binary Coded Decimal Interchange Code] n. An alleged character set used on IBM dinosaurs. It exists in at least six mutually incompatible versions, all featuring such delights as ...
echo => [FidoNet] n. A {topic group} on FidoNet's echomail system. Compare newsgroup.
eighty-column mind => [IBM] n. The sort said to be possessed by persons for whom the transition from {punched card} to tape was traumatic (nobody has dared tell them about disks yet). It is said that these people, including (according to an old joke)...
eighty-column mind2 => `face down, 9-edge first' (the 9-edge being the bottom of the card). This directive is inscribed on IBM's 1422 and 1602 card readers and is referenced in a famous bit of doggerel called "The Last Bug", the climactic lines of wh...
eighty-column mind3 => the console Of hunger and thirst. Next day he was buried, Face down, 9-edge first. The eighty-column mind is thought by most hackers to dominate IBM's customer base and its thinking. See IBM, {fear and loathing}, {card walloper...
El Camino Bignum => /el' k*-mee'noh big'nuhm/ n. The road mundanely called El Camino Real, a road through the San Francisco peninsula that originally extended all the way down to Mexico City and many portions of which are still intact. Navigation on ...
El Camino Bignum2 => usually done relative to El Camino Real, which defines logical north and south even though it isn't really north-south many places. El Camino Real runs right past Stanford University and so is familiar to hackers. The Spanish wor...
El Camino Bignum3 => /ray-ahl'/) means `royal'; El Camino Real is `the royal road'. In the FORTRAN language, a `real' quantity is a number typically precise to 7 significant digits, and a `double precision' quantity is a larger floating-point number,...
El Camino Bignum4 => significant digits (other languages have similar `real' types). When a hacker from MIT visited Stanford in 1976, he remarked what a long road El Camino Real was. Making a pun on `real', he started calling it `El Camino Double Pre...
El Camino Bignum5 => told that the road was hundreds of miles long, he renamed it `El Camino Bignum', and that name has stuck. (See bignum.) 
elder days => n. The heroic age of hackerdom (roughly, pre-1980); the era of the PDP-10, TECO, {ITS}, and the ARPANET. This term has been rather consciously adopted from J. R. R. Tolkien's fantasy epic `The Lord of the Rings'. Compare {Iron Age}; see...
elegant => [from mathematical usage] adj. Combining simplicity, power, and a certain ineffable grace of design. Higher praise than `clever', `winning', or even cuspy.
elephantine => adj. Used of programs or systems that are both conspicuous hogs (owing perhaps to poor design founded on {brute force and ignorance}) and exceedingly hairy in source form. An elephantine program may be functional and even friendly, but...
elevator controller => n. Another archetypal dumb embedded-systems application, like toaster (which superseded it). During one period (1983--84) in the deliberations of ANSI X3J11 (the C standardization committee) this was the canonical example of a ...
elevator controller2 => computation environment. "You can't require `printf(3)' to be part of the default runtime library --- what if you're targeting an elevator controller?" Elevator controllers became important rhetorical weapons on both sides of ...
ELIZA effect => /*-li'z* *-fekt'/ [AI community] n. The tendency of humans to attach associations to terms from prior experience. For example, there is nothing magic about the symbol `+' that makes it well-suited to indicate addition; it's just that ...
ELIZA effect2 => Using `+' or `plus' to mean addition in a computer language is taking advantage of the ELIZA effect. This term comes from the famous ELIZA program, which simulated a Rogerian psychoanalyst by rephrasing many of the patient's statemen...
ELIZA effect3 => patient. It worked by simple pattern recognition and substitution of key words into canned phrases. It was so convincing, however, that there are many anecdotes about people becoming very emotionally caught up in dealing with ELIZA. ...

factpacks/jargon.fact  view on Meta::CPAN

tourist => [ITS] n. A guest on the system, especially one who generally logs in over a network from a remote location for {comm mode}, email, games, and other trivial purposes. One step below luser. Hackers often spell this turist, perhaps by some so...
tourist information => n. Information in an on-line display that is not immediately useful, but contributes to a viewers gestalt of whats going on with the software or hardware behind it. Whether a given piece of info falls in this category depends p...
tourist information2 => for at any given time. The `bytes free information at the bottom of an MS-DOS `dir display is tourist information; so (most of the time) is the TIME information in a UNIX `ps(1) display. 
touristic => adj. Having the quality of a tourist. Often used as a pejorative, as in `losing touristic scum. Often spelled `turistic or `turistik, so that phrase might be more properly rendered `lusing turistic scum.
toy => n. A computer system; always used with qualifiers. 1. `nice toy One that supports the speakers hacking style adequately. 2. `just a toy A machine that yields insufficient computrons for the speakers preferred uses. This is not condemnatory, as...
toy language => n. A language useful for instructional purposes or as a proof-of-concept for some aspect of computer-science theory, but inadequate for general-purpose programming. {Bad Thing}s can result when a toy language is promoted as a general ...
toy language2 => (see {bondage-and-discipline language}); the classic example is {Pascal}. Several moderately well-known formalisms for conceptual tasks such as programming Turing machines also qualify as toy languages in a less negative sense. See a...
toy problem => [AI] n. A deliberately oversimplified case of a challenging problem used to investigate, prototype, or test algorithms for a real problem. Sometimes used pejoratively. See also gedanken, {toy program}.
toy program => n. 1. One that can be readily comprehended; hence, a trivial program (compare noddy). 2. One for which the effort of initial coding dominates the costs through its life cycle. See also noddy.
trampoline => n. An incredibly hairy technique, found in some HLL and program-overlay implementations (e.g., on the Macintosh), that involves on-the-fly generation of small executable (and, likely as not, self-modifying) code objects to do indirectio...
trap => 1. n. A program interrupt, usually an interrupt caused by some exceptional situation in the user program. In most cases, the OS performs some action, then returns control to the program. 2. vi. To cause a trap. "These instructions trap to the...
trap door => alt. `trapdoor n. 1. Syn. {back door}. 2. [techspeak] A `trap-door function is one which is easy to compute but very difficult to compute the inverse of. Such functions have important applications in cryptography, specifically in the con...
trash => vt. To destroy the contents of (said of a data structure). The most common of the family of near-synonyms including mung, mangle, and scribble.
tree-killer => [Sun] n. 1. A printer. 2. A person who wastes paper. This should be interpreted in a broad sense; `wasting paper includes the production of spiffy but content-free documents. Thus, most suits are tree-killers.
trit => /trit/ [by analogy with `bit] n. One base-3 digit; the amount of information conveyed by a selection among one of three equally likely outcomes (see also bit). These arise, for example, in the context of a flag that should actually be able to...
trivial => adj. 1. Too simple to bother detailing. 2. Not worth the speakers time. 3. Complex, but solvable by methods so well known that anyone not utterly cretinous would have thought of them already. 4. Any problem one has already solved (some cla...
troglodyte => [Commodore] n. 1. A hacker who never leaves his cubicle. The term `Gnoll (from Dungeons & Dragons) is also reported. 2. A curmudgeon attached to an obsolescent computing environment. The combination `ITS troglodyte was flung around some...
troglodyte mode => [Rice University] n. Programming with the lights turned off, sunglasses on, and the terminal inverted (black on white) because youve been up for so many days straight that your eyes hurt (see {raster burn}). Loud music blaring from...
troglodyte mode2 => optional but recommended. See {larval stage}, {hack mode}. 
Trojan horse => [coined by MIT-hacker-turned-NSA-spook Dan Edwards] n. A program designed to break security or damage a system that is disguised as something else benign, such as a directory lister, archiver, a game, or (in one notorious 1990 case on...
Trojan horse2 => destroy viruses! See {back door}, virus, worm. 
true-hacker => [analogy with `trufan from SF fandom] n. One who exemplifies the primary values of hacker culture, esp. competence and helpfulness to other hackers. A high compliment. "He spent 6 hours helping me bring up UUCP and netnews on my FOOBAR...
tty => /T-T-Y/ [UNIX], /titee/ [ITS, but some UNIX people say it this way as well; this pronunciation is not considered to have sexual undertones] n. 1. A terminal of the teletype variety, characterized by a noisy mechanical printer, a very limited c...
tube => 1. n. A CRT terminal. Never used in the mainstream sense of TV; real hackers dont watch TV, except for Loony Toons, Rocky & Bullwinkle, Trek Classic, the Simpsons, and the occasional cheesy old swashbuckler movie (see appendix B). 2. [IBM] To...
tube time => n. Time spent at a terminal or console. More inclusive than hacking time; commonly used in discussions of what parts of ones environment one uses most heavily. "I find Im spending too much of my tube time reading mail since I started thi...
tunafish => n. In hackish lore, refers to the mutated punchline of an age-old joke to be found at the bottom of the manual pages of `tunefs(8) in the original BSD 4.2 distribution. The joke was removed in later releases once commercial sites started ...
tune => [from automotive or musical usage] vt. To optimize a program or system for a particular environment, esp. by adjusting numerical parameters designed as hooks for tuning, e.g., by changing `#define lines in C. One may `tune for time (fastest e...
turbo nerd => n. See {computer geek}.
turist => /toorist/ n. Var. sp. of tourist, q.v. Also in adjectival form, `turistic. Poss. influenced by luser and `Turing.
tweak => vt. 1. To change slightly, usually in reference to a value. Also used synonymously with twiddle. If a program is almost correct, rather than figure out the precise problem you might just keep tweaking it until it works. See frobnicate and {f...
TWENEX => /tweneks/ n. The TOPS-20 operating system by DEC --- the second proprietary OS for the PDP-10 --- preferred by most PDP-10 hackers over TOPS-10 (that is, by those who were not {ITS} or {WAITS} partisans). TOPS-20 began in 1969 as Bolt, Bera...
twiddle => n. 1. Tilde (ASCII 1111110, `~). Also called `squiggle, `sqiggle (sic --- pronounced /skigl/), and `twaddle, but twiddle is the most common term. 2. A small and insignificant change to a program. Usually fixes one bug and generates several...
twink => /twink/ [UCSC] n. Equivalent to {read-only user}. Also reported on the USENET group soc.motss; may derive from gay slang for a cute young thing with nothing upstairs.
two pi => quant. The number of years it takes to finish ones thesis. Occurs in stories in the following form "He started on his thesis; 2 pi years later..."
two-to-the-N => quant. An amount much larger than N but smaller than infinity. "I have 2-to-the-N things to do before I can go out for lunch" means you probably wont show up.
twonkie => /twonkee/ n. The software equivalent of a Twinkie (a variety of sugar-loaded junk food, or (in gay slang) the male equivalent of `chick); a useless `feature added to look sexy and placate a marketroid (compare {Saturday-night special}). Th...
UN*X => n. Used to refer to the UNIX operating system (a trademark of AT&T) in writing, but avoiding the need for the ugly (TM) typography. Also used to refer to any or all varieties of Unixoid operating systems. Ironically, lawyers now say (1990) th...
undefined external reference => excl. [UNIX] A message from UNIX's linker. Used in speech to flag loose ends or dangling references in an argument or discussion.
under the hood => prep. [hot-rodder talk] 1. Used to introduce the underlying implementation of a product (hardware, software, or idea). Implies that the implementation is not intuitively obvious from the appearance, but the speaker is about to enabl...
under the hood2 => now look under the hood to see how ...." 2. Can also imply that the implementation is much simpler than the appearance would indicate "Under the hood, we are just fork/execing the shell." 3. Inside a chassis, as in "Under the hood,...
undocumented feature => n. See feature.
uninteresting => adj. 1. Said of a problem that, although nontrivial, can be solved simply by throwing sufficient resources at it. 2. Also said of problems for which a solution would neither advance the state of the art nor be fun to design and code....
UNIX => /yoo'niks/ [In the authors' words, "A weak pun on Multics"] n. (also `Unix') An interactive time-sharing system originally invented in 1969 by Ken Thompson after Bell Labs left the Multics project, originally so he could play games on his sca...
UNIX brain damage => n. Something that has to be done to break a network program (typically a mailer) on a non-UNIX system so that it will interoperate with UNIX systems. The hack may qualify as `UNIX brain damage' if the program conforms to publishe...
UNIX brain damage2 => question does not. UNIX brain damage happens because it is much easier for other (minority) systems to change their ways to match non-conforming behavior than it is to change all the hundreds of thousands of UNIX systems out the...
UNIX brain damage3 => is a kluge in a mail server to recognize bare line feed (the UNIX newline) as an equivalent form to the Internet standard newline, which is a carriage return followed by a line feed. Such things can make even a hardened jock wee...
UNIX conspiracy => [ITS] n. According to a conspiracy theory long popular among {ITS} and {TOPS-20} fans, UNIX's growth is the result of a plot, hatched during the 1970s at Bell Labs, whose intent was to hobble AT&T's competitors by making them depen...
UNIX conspiracy2 => evolution was to be under AT&T's control. This would be accomplished by disseminating an operating system that is apparently inexpensive and easily portable, but also relatively unreliable and insecure (so as to require continuing...
UNIX conspiracy3 => was lent a substantial impetus in 1984 by the paper referenced in the {back door} entry. In this view, UNIX was designed to be one of the first computer viruses (see virus) --- but a virus spread to computers indirectly by people ...
UNIX conspiracy4 => directly through disks and networks. Adherents of this `UNIX virus' theory like to cite the fact that the well-known quotation "UNIX is snake oil" was uttered by DEC president Kenneth Olsen shortly before DEC began actively promot...
UNIX conspiracy5 => workstations. (Olsen now claims to have been misquoted.) 
UNIX weenie => [ITS] n. 1. A derogatory play on `UNIX wizard', common among hackers who use UNIX by necessity but would prefer alternatives. The implication is that although the person in question may consider mastery of UNIX arcana to be a wizardly ...
UNIX weenie2 => is the ability to tolerate (and the bad taste to wallow in) the incoherence and needless complexity that is alleged to infest many UNIX programs. "This shell script tries to parse its arguments in 69 bletcherous ways. It must have bee...
UNIX weenie3 => 2. A derogatory term for anyone who engages in uncritical praise of UNIX. Often appearing in the context "stupid UNIX weenie". See Weenix, {UNIX conspiracy}. See also weenie. 
unixism => n. A piece of code or a coding technique that depends on the protected multi-tasking environment with relatively low process-spawn overhead that exists on virtual-memory UNIX systems. Common unixisms include gratuitous use of `fork(2)'; th...
unswizzle => v. See swizzle.
unwind the stack => vi. 1. [techspeak] During the execution of a procedural language, one is said to `unwind the stack' from a called procedure up to a caller when one discards the stack frame and any number of frames above it, popping back up to the...
unwind the stack2 => this is done with `longjmp'/`setjmp', in LISP with `throw/catch'. See also {smash the stack}. 2. People can unwind the stack as well, by quickly dealing with a bunch of problems "Oh heck, let's do lunch. Just a second while I unw...
unwind-protect => [MIT from the name of a LISP operator] n. A task you must remember to perform before you leave a place or finish a project. "I have an unwind-protect to call my advisor."
up => adj. 1. Working, in order. "The down escalator is up." Oppose down. 2. `bring up' vt. To create a working version and start it. "They brought up a down system." 3. `come up' vi. To become ready for production use.
upload => /uhp'lohd/ v. 1. [techspeak] To transfer programs or data over a digital communications link from a smaller or peripheral `client' system to a larger or central `host' one. A transfer in the other direction is, of course, called a download ...
upthread => adv. Earlier in the discussion (see thread), i.e., `above'. "As Joe pointed out upthread, ..." See also followup.
urchin => n. See munchkin.
USENET => /yoos'net/ or /yooz'net/ [from `Users' Network'] n. A distributed bboard (bulletin board) system supported mainly by UNIX machines. Originally implemented in 1979-1980 by Steve Bellovin, Jim Ellis, Tom Truscott, and Steve Daniel at Duke Uni...
user => n. 1. Someone doing `real work' with the computer, using it as a means rather than an end. Someone who pays to use a computer. See {real user}. 2. A programmer who will believe anything you tell him. One who asks silly questions. [GLS observe...
user-friendly => adj. Programmer-hostile. Generally used by hackers in a critical tone, to describe systems that hold the user's hand so obsessively that they make it painful for the more experienced and knowledgeable to get any work done. See menuit...
user-obsequious => adj. Emphatic form of user-friendly. Connotes a system so verbose, inflexible, and determinedly simple-minded that it is nearly unusable. "Design a system any fool can use and only a fool will want to use it." See {WIMP environment...
USG UNIX => /U-S-G yoo'niks/ n. Refers to AT&T UNIX commercial versions after {Version 7}, especially System III and System V releases 1, 2, and 3. So called because during most of the life-span of those versions AT&T's support crew was called the `U...
UTSL => // [UNIX] n. On-line acronym for `Use the Source, Luke' (a pun on Obi-Wan Kenobi's "Use the Force, Luke!" in `Star Wars') --- analogous to RTFM but more polite. This is a common way of suggesting that someone would be best off reading the sou...
UUCPNET => n. The store-and-forward network consisting of all the world's connected UNIX machines (and others running some clone of the UUCP (UNIX-to-UNIX CoPy) software). Any machine reachable only via a {bang path} is on UUCPNET. See {network addre...
vanilla => [from the default flavor of ice cream in the U.S.] adj. Ordinary flavor, standard. When used of food, very often does not mean that the food is flavored with vanilla extract! For example, `vanilla wonton soup' means ordinary wonton soup, a...
vannevar => /van'*-var/ n. A bogus technological prediction or a foredoomed engineering concept, esp. one that fails by implicitly assuming that technologies develop linearly, incrementally, and in isolation from one another when in fact the learning...
vaporware => /vay'pr-weir/ n. Products announced far in advance of any release (which may or may not actually take place).
var => /veir/ or /var/ n. Short for `variable'. Compare arg, param.
VAX => /vaks/ n. 1. [from Virtual Address eXtension] The most successful minicomputer design in industry history, possibly excepting its immediate ancestor, the PDP-11. Between its release in 1978 and its eclipse by {killer micro}s after about 1986, ...
VAXectomy => /vak-sek't*-mee/ [by analogy with `vasectomy'] n. A VAX removal. DEC's Microvaxen, especially, are much slower than newer RISC-based workstations such as the SPARC. Thus, if one knows one has a replacement coming, VAX removal can be caus...
VAXen => /vak'sn/ [from `oxen', perhaps influenced by `vixen'] n. (alt. `vaxen') The plural canonically used among hackers for the DEC VAX computers. "Our installation has four PDP-10s and twenty vaxen." See boxen.
vaxherd => n. /vaks'herd/ [from `oxherd'] A VAX operator.
vaxism => /vak'sizm/ n. A piece of code that exhibits vaxocentrism in critical areas. Compare PC-ism, unixism.
vaxocentrism => /vak`soh-sen'trizm/ [analogy with `ethnocentrism'] n. A notional disease said to afflict C programmers who persist in coding according to certain assumptions that are valid (esp. under UNIX) on VAXen but false elsewhere. Among these a...
vdiff => /vee'dif/ v.,n. Visual diff. The operation of finding differences between two files by {eyeball search}. The term `optical diff' has also been reported. See diff.
veeblefester => /vee'b*l-fes`tr/ [from the "Born Loser" comix via Commodore; prob. originally from `Mad' Magazine's `Veeblefeetzer' parodies ca. 1960] n. Any obnoxious person engaged in the (alleged) professions of marketing or management. Antonym of...
Venus flytrap => [after the insect-eating plant] n. See {firewall machine}.
verbage => /ver'b*j/ n. A deliberate misspelling and mispronunciation of verbiage that assimilates it to the word `garbage'. Compare content-free. More pejorative than `verbiage'.
verbiage => n. When the context involves a software or hardware system, this refers to {documentation}. This term borrows the connotations of mainstream `verbiage' to suggest that the documentation is of marginal utility and that the motives behind i...
Version 7 => alt. V7 /vee' se'vn/ n. The 1978 unsupported release of {UNIX} ancestral to all current commercial versions. Before the release of the POSIX/SVID standards, V7's features were often treated as a UNIX portability baseline. See BSD, {USG U...
Version 72 => old-timers impatient with commercialization and kernel bloat still maintain that V7 was the Last True UNIX. 
vgrep => /vee'grep/ v.,n. Visual grep. The operation of finding patterns in a file optically rather than digitally. See grep; compare vdiff.
vi => /V-I/, *not* /vi/ and *never* /siks/ [from `Visual Interface'] n. A screen editor crufted together by Bill Joy for an early BSD version. Became the de facto standard UNIX editor and a nearly undisputed hacker favorite until the rise of EMACS af...
videotex => n. obs. An electronic service offering people the privilege of paying to read the weather on their television screens instead of having somebody read it to them for free while they brush their teeth. The idea bombed everywhere it wasn't g...
virgin => adj. Unused; pristine; in a known initial state. "Let's bring up a virgin system and see if it crashes again." (Esp. useful after contracting a virus through SEX.) Also, by extension, buffers and the like within a program that have not yet ...
virtual => [via the technical term `virtual memory', prob. from the term `virtual image' in optics] adj. 1. Common alternative to logical. 2. Simulated; performing the functions of something that isn't really there. An imaginative child's doll may be...
virtual Friday => n. The last day before an extended weekend, if that day is not a `real' Friday. For example, the U.S. holiday Thanksgiving is always on a Thursday. The next day is often also a holiday or taken as an extra day off, in which case Wed...
virtual Friday2 => Friday (and Thursday is a virtual Saturday, as is Friday). There are also `virtual Mondays' that are actually Tuesdays, after the three-day weekends associated with many national holidays in the U.S. 
virtual reality => n. 1. Computer simulations that use 3-D graphics and devices such as the Dataglove to allow the user to interact with the simulation. See cyberspace. 2. A form of network interaction incorporating aspects of role-playing games, int...
virtual reality2 => comedy, and `true confessions' magazines. In a virtual reality forum (such as USENET's alt.callahans newsgroup or the MUD experiments on Internet), interaction between the participants is written like a shared novel complete with ...
virtual reality3 => that may be personae utterly unlike the people who write them, and common `background characters' manipulable by all parties. The one iron law is that you may not write irreversible changes to a character without the consent of th...
virtual reality4 => anything goes. See bamf, cyberspace. 
virus => [from the obvious analogy with biological viruses, via SF] n. A cracker program that searches out other programs and `infects' them by embedding a copy of itself in them, so that they become {Trojan Horse}s. When these programs are executed,...
visionary => n. 1. One who hacks vision, in the sense of an Artificial Intelligence researcher working on the problem of getting computers to `see' things using TV cameras. (There isn't any problem in sending information from a TV camera to a compute...
VMS => /V-M-S/ n. DEC's proprietary operating system for its VAX minicomputer; one of the seven or so environments that loom largest in hacker folklore. Many UNIX fans generously concede that VMS would probably be the hacker's favorite commercial OS ...
voice => vt. To phone someone, as opposed to emailing them or connecting in talk mode. "I'm busy now; I'll voice you later."
voice-net => n. Hackish way of referring to the telephone system, analogizing it to a digital network. USENET {sig block}s not uncommonly include the sender's phone next to a "Voice" or "Voice-Net" header; common variants of this are "Voicenet" and "...
voodoo programming => [from George Bush's "voodoo economics"] n. The use by guess or cookbook of an obscure or hairy system, feature, or algorithm that one does not truly understand. The implication is that the technique may not work, and if it doesn...
voodoo programming2 => Almost synonymous with {black magic}, except that black magic typically isn't documented and *nobody* understands it. Compare magic, {deep magic}, {heavy wizardry}, {rain dance}, {cargo cult programming}, {wave a dead chicken}....
VR => // [MUD] n. On-line abbrev for {virtual reality}, as opposed to RL.
Vulcan nerve pinch => n. [from the old "Star Trek" TV series via Commodore Amiga hackers] The keyboard combination that forces a soft-boot or jump to ROM monitor (on machines that support such a feature). On many micros this is Ctrl-Alt-Del; on Suns,...
Vulcan nerve pinch2 => <Cmd>-<Power switch>! Also called {three-finger salute}. Compare {quadruple bucky}. 
vulture capitalist => n. Pejorative hackerism for `venture capitalist', deriving from the common practice of pushing contracts that deprive inventors of control over their own innovations and most of the money they ought to have made from them.*wabbi...
vulture capitalist2 => Fudd's immortal line "You wascawwy wabbit!"] n. 1. A legendary early hack reported on a System/360 at RPI and elsewhere around 1978. The program would make two copies of itself every time it was run, eventually crashing the sys...
vulture capitalist3 => includes infinite self-replication but is not a virus or worm. See also {cookie monster}. 
WAITS => /wayts/ n. The mutant cousin of {TOPS-10} used on a handful of systems at {SAIL} up to 1990. There was never an `official' expansion of WAITS (the name itself having been arrived at by a rather sideways process), but it was frequently glosse...
waldo => /wol'doh/ [From Robert A. Heinlein's story "Waldo"] 1. A mechanical agent, such as a gripper arm, controlled by a human limb. When these were developed for the nuclear industry in the mid-1940s they were named after the invention described b...
walk => n.,vt. Traversal of a data structure, especially an array or linked-list data structure in core. See also codewalker, {silly walk}, clobber.
walk off the end of => vt. To run past the end of an array, list, or medium after stepping through it --- a good way to land in trouble. Often the result of an {off-by-one error}. Compare clobber, roach, {smash the stack}.
walking drives => n. An occasional failure mode of magnetic-disk drives back in the days when they were huge, clunky {washing machine}s. Those old dinosaur parts carried terrific angular momentum; the combination of a misaligned spindle or worn beari...
walking drives2 => with the floor could cause them to `walk' across a room, lurching alternate corners forward a couple of millimeters at a time. There is a legend about a drive that walked over to the only door to the computer room and jammed it shu...
walking drives3 => wall in order to get at it! Walking could also be induced by certain patterns of drive access (a fast seek across the whole width of the disk, followed by a slow seek in the other direction). Some bands of old-time hackers figured ...
walking drives4 => patterns that would do this to particular drive models and held disk-drive races. 
wall => [WPI] interj. 1. An indication of confusion, usually spoken with a quizzical tone "Wall??" 2. A request for further explication. Compare {octal forty}. It is said that "Wall?" really came from `like talking to a blank wall'. It was initially ...
wall follower => n. A person or algorithm that compensates for lack of sophistication or native stupidity by efficiently following some simple procedure shown to have been effective in the past. Used of an algorithm, this is not necessarily pejorativ...