The Hacker's Dictionary by - (sneezy the snowman read aloud txt) 📕

engines in the mid-1800s) would almost certainly blanch at the use to which her name has latterly been put; the kindest thing that has been said about it is that there is probably a good small language screaming to get out from inside its vast, {elephantine} bulk.

:adger: /aj'r/ [UCLA] vt. To make a bonehead move with consequences that could have been foreseen with a slight amount of mental effort. E.g., "He started removing files and promptly adgered the whole project". Compare {dumbass attack}.

:admin: /ad-min'/ n. Short for administrator'; very commonly used in speech or on-line to refer to the systems person in charge on a computer. Common constructions on this includesysadmin'

and site admin' (emphasizing the administrator's role as a site contact for email and news) ornewsadmin' (focusing specifically on news). Compare {postmaster}, {sysop}, {system mangler}.

:ADVENT: /ad'vent/ n. The prototypical computer adventure game, first implemented on the {PDP-10} by Will Crowther as an attempt at computer-refereed fantasy gaming, and expanded into a puzzle-oriented game by Don Woods. Now better known as Adventure, but the {{TOPS-10}} operating system permitted only 6-letter filenames. See also {vadding}.

This game defined the terse, dryly humorous style now expected in text adventure games, and popularized several tag lines that have become fixtures of hacker-speak: "A huge green fierce snake bars the way!" "I see no X here" (for some noun X). "You are in a maze of twisty little passages, all alike." "You are in a little maze of twisty passages, all different." The `magic words'

{xyzzy} and {plugh} also derive from this game.

Crowther, by the way, participated in the exploration of the Mammoth & Flint Ridge cave system; it actually has a Colossal Cave' and aBedquilt' as in the game, and the `Y2' that also turns up is cavers' jargon for a map reference to a secondary entrance.

:AFJ: n. Written-only abbreviation for "April Fool's Joke".

Elaborate April Fool's hoaxes are a hallowed tradition on USENET

and Internet; see {kremvax} for an example. In fact, April Fool's Day is the only seasonal holiday marked by customary observances on the hacker networks.

:AI-complete: /A-I k*m-pleet'/ [MIT, Stanford: by analogy with NP-complete' (see {NP-})] adj. Used to describe problems or subproblems in AI, to indicate that the solution presupposes a solution to thestrong AI problem' (that is, the synthesis of a human-level intelligence). A problem that is AI-complete is, in other words, just too hard.

Examples of AI-complete problems are `The Vision Problem'

(building a system that can see as well as a human) and The Natural Language Problem' (building a system that can understand and speak a natural language as well as a human). These may appear to be modular, but all attempts so far (1991) to solve them have foundered on the amount of context information andintelligence'

they seem to require. See also {gedanken}.

:AI koans: /A-I koh'anz/ pl.n. A series of pastiches of Zen teaching riddles created by Danny Hillis at the MIT AI Lab around various major figures of the Lab's culture (several are included under "{A Selection of AI Koans}" in {appendix A}). See also {ha ha only serious}, {mu}, and {{Humor, Hacker}}.

:AIDS: /aydz/ n. Short for A Infected Disk Syndrome (`A' is a {glob} pattern that matches, but is not limited to, Apple), this condition is quite often the result of practicing unsafe {SEX}. See {virus}, {worm}, {Trojan horse}, {virgin}.

:AIDX: n. /aydkz/ n. Derogatory term for IBM's perverted version of UNIX, AIX, especially for the AIX 3.? used in the IBM RS/6000

series. A victim of the dreaded "hybridism" disease, this attempt to combine the two main currents of the UNIX stream ({BSD} and {USG UNIX}) became a {monstrosity} to haunt system administrators' dreams. For example, if new accounts are created while many users are logged on, the load average jumps quickly over 20 due to silly implementation of the user databases.

For a quite similar disease, compare {HP-SUX}. Also, compare {terminak}, {Macintrash} {Nominal Semidestructor}, {Open DeathTrap}, {ScumOS}, {sun-stools}.

:airplane rule: n. "Complexity increases the possibility of failure; a twin-engine airplane has twice as many engine problems as a single-engine airplane." By analogy, in both software and electronics, the rule that simplicity increases robustness (see also {KISS Principle}). It is correspondingly argued that the right way to build reliable systems is to put all your eggs in one basket, after making sure that you've built a really good

basket.

:aliasing bug: n. A class of subtle programming errors that can arise in code that does dynamic allocation, esp. via malloc(3)' or equivalent. If more than one pointer addresses (aliases for') a given hunk of storage, it may happen that the storage is freed or reallocated (and thus moved) through one alias and then referenced through another, which may lead to subtle (and possibly intermittent) lossage depending on the state and the allocation history of the malloc {arena}. Avoidable by use of allocation strategies that never alias allocated core. Also avoidable by use of higher-level languages, such as {LISP}, which employ a garbage collector (see {GC}). Also called a {stale pointer bug}. See also {precedence lossage}, {smash the stack}, {fandango on core}, {memory leak}, {memory smash}, {overrun screw}, {spam}.

Historical note: Though this term is nowadays associated with C programming, it was already in use in a very similar sense in the Algol-60 and FORTRAN communities in the 1960s.

:all-elbows: adj. Of a TSR (terminate-and-stay-resident) IBM PC

program, such as the N pop-up calendar and calculator utilities that circulate on {BBS} systems: unsociable. Used to describe a program that rudely steals the resources that it needs without considering that other TSRs may also be resident. One particularly common form of rudeness is lock-up due to programs fighting over the keyboard interrupt. See {rude}, also {mess-dos}.

:alpha particles: n. See {bit rot}.

:alt: /awlt/ 1. n. The alt shift key on an IBM PC or {clone}.

n. The clover' orCommand' key on a Macintosh; use of this term usually reveals that the speaker hacked PCs before coming to the Mac (see also {feature key}). Some Mac hackers, confusingly, reserve alt' for the Option key. 3. n.obs. [PDP-10; often capitalized to ALT] Alternate name for the ASCII ESC character (ASCII 0011011), after the keycap labeling on some older terminals. Alsoaltmode' (/awlt'mohd/). This character was almost never pronounced escape' on an ITS system, in {TECO}, or under TOPS-10 --- always alt, as in "Type alt alt to end a TECO command" or "alt-U onto the system" (for "log onto the [ITS] system"). This was probably because alt is more convenient to say thanescape', especially when followed by another alt or a character (or another alt and a character, for that matter).

:alt bit: /awlt bit/ [from alternate] adj. See {meta bit}.

:altmode: n. Syn. {alt} sense 3.

:Aluminum Book: [MIT] n. `Common LISP: The Language', by Guy L. Steele Jr. (Digital Press, first edition 1984, second edition 1990). Note that due to a technical screwup some printings of the second edition are actually of a color the author describes succinctly as "yucky green". See also {{book titles}}.

:amoeba: n. Humorous term for the Commodore Amiga personal computer.

:amp off: [Purdue] vt. To run in {background}. From the UNIX shell `&'

operator.

:amper: n. Common abbreviation for the name of the ampersand (`&', ASCII 0100110) character. See {{ASCII}} for other synonyms.

:angle brackets: n. Either of the characters <' (ASCII 0111100) and>' (ASCII 0111110) (ASCII less-than or greater-than signs). The {Real World} angle brackets used by typographers are actually taller than a less-than or greater-than sign.

See {broket}, {{ASCII}}.

:angry fruit salad: n. A bad visual-interface design that uses too many colors. This derives, of course, from the bizarre day-glo colors found in canned fruit salad. Too often one sees similar effects from interface designers using color window systems such as {X}; there is a tendency to create displays that are flashy and attention-getting but uncomfortable for long-term use.

:annoybot: /*-noy-bot/ [IRC] n. See {robot}.

:AOS: 1. /aws/ (East Coast), /ay-os/ (West Coast) [based on a PDP-10 increment instruction] vt.,obs. To increase the amount of something. "AOS the campfire." Usage: considered silly, and now obsolete. Now largely supplanted by {bump}. See {SOS}. 2. A {{Multics}}-derived OS supported at one time by Data General. This was pronounced /A-O-S/ or /A-os/. A spoof of the standard AOS system administrator's manual (How to Load and Generate your AOS System') was created, issued a part number, and circulated as photocopy folklore. It was calledHow to Goad and Levitate your CHAOS System'. 3. Algebraic Operating System, in reference to those calculators which use infix instead of postfix (reverse Polish) notation.

Historical note: AOS in sense 1 was the name of a {PDP-10}

instruction that took any memory location in the computer and added 1 to it; AOS meant Add One and do not Skip'. Why, you may ask, does theS' stand for do not Skip' rather than forSkip'? Ah, here was a beloved piece of PDP-10 folklore. There were eight such instructions: AOSE added 1 and then skipped the next instruction if the result was Equal to zero; AOSG added 1 and then skipped if the result was Greater than 0; AOSN added 1 and then skipped if the result was Not 0; AOSA added 1 and then skipped Always; and so