explain xkcd - User contributions [en]

Talk:1692: Man Page

2016-06-13T02:38:00Z

108.162.216.98:

I do not entirely understand how wikis work; however, I have attempted to add a transcript. I apologize if anything breaks. I also apologize if this is not how I should be apologizing.

[[Special:Contributions/108.162.241.135|108.162.241.135]] 04:27, 10 June 2016 (UTC)

The Pope flag is referencing the time of the [https://en.wikipedia.org/wiki/Avignon_Papacy Avignon Papacy] --[[Special:Contributions/108.162.237.243|108.162.237.243]] 04:56, 10 June 2016 (UTC)

:Would have frickin' loved Randall if he inserted a reference to Pope of Dope here. :D [[User:Todor|Todor]] ([[User talk:Todor|talk]]) 08:17, 10 June 2016 (UTC)

OK, -e -h -v doesn't seem to work, it keeps halting at an input line!

Also, -p "AVIGNON" only works if I specify -D -I, -O, or -jk.

Why isn't -x documented on this man page? -x seems to do ''something'' but I'm not sure what the value of it is.

-y just returns "CHROMOSOME MISMATCH".

-a -e -f -n -o -r -S works if I specify -g, but -R starts to return CloudFlare errors after the first few million sites.

-v -d seems to make debug.exe speak out loud, but eventually it just starts spouting seemingly random numbers, unless I use -q. Is this desired behavior, or a bug?

{{unsigned ip|255.255.255.0}}
(-jk | off) [[Special:Contributions/108.162.221.8|108.162.221.8]] 20:19, 10 June 2016 (UTC)

The horrible thing about this comic is that somebody is sure to have implemented this program by the end of the day... {{unsigned ip|141.101.104.140}}

:Found one on Github: https://github.com/iKevinY/blerp . It has a man page file, but the program itself just outputs "bleep blerp" and doesn't implement any of the flags (yet?). [[Special:Contributions/141.101.104.141|141.101.104.141]] 08:05, 10 June 2016 (UTC)

"Behavior Not Defined" might be a reference to undefined behavior, where a program is allowed to do anything including make demons fly out your nose: https://en.wikipedia.org/wiki/Undefined_behavior [[Special:Contributions/108.162.219.12|108.162.219.12]] 06:48, 10 June 2016 (UTC)

[[Special:Contributions/162.158.135.36|162.158.135.36]] 06:58, 10 June 2016 (UTC) Søren Mors

I thought Ansel was a deliberate misspelling of ANSI, the most common 8 bit codepage. {{unsigned ip|162.158.135.36}}

The commit "Revision as of 07:08, 10 June 2016" reverted an IMO good explanation for the debug option with a bad one. Consider changing it back. [[User:Todor|Todor]] ([[User talk:Todor|talk]]) 07:20, 10 June 2016 (UTC)
:I agree. The bad explanation also mixed up {{w|Pipeline (Unix)|piping}} with {{w|Redirection (computing)|redirection}} --[[Special:Contributions/141.101.104.76|141.101.104.76]] 07:41, 10 June 2016 (UTC)

I don't think `blerp -a -d -t -p "AVIGNON"` is a valid call to blerp, because the syntax line syntax is utterly off. For example, the first line has an unclosed open [, whereas the second line – in addition to having the corresponding unmatched ] – plays with the fact that even though {} is usually used to list a set of required items, {} is also how `find` (which might do something similar to blerp, and is in fact mentioned in -v) denotes its results when passed to an exec. {{unsigned ip|141.101.104.30}}

Command line options do not normally use n-dashes; they use hyphens. Another problem with this option is that n-dashes and m-dashes cannot usually be displayed properly in the fixed-width fonts commonly used for command line terminals. The usual custom is to use two hyphens to represent a dash (which for proportional font display will often be converted to either an n-dash or m-dash).
: In groff (GNU troff, the language in which man pages are written) the code for an m-dash is '''\(em'''. It will display as either two hyphens "'''--'''" or as an actual m-dash "'''—'''" depending on the character set specified in the locale environment variables. [[User:Locoluis|Locoluis]] ([[User talk:Locoluis|talk]]) 17:17, 10 June 2016 (UTC)
: Many commands use a double dash "--" to specify the end of the options. In "ls -a" the "-a" is an option. In "ls -- -a" the "-a" is the name of the file.--[[Special:Contributions/108.162.218.59|108.162.218.59]] 16:00, 11 June 2016 (UTC)

While "check whether input halts" clearly alludes to the halting problem, it may not actually be impossible, depending on what blerp actually does and what sort of input it accepts. (It says nothing about actually ''reporting'' the result, and it makes no guarantees that it will itself halt.)

—[[User:PhantomLimbic|PhantomLimbic]] ([[User talk:PhantomLimbic|talk]]) 07:30, 10 June 2016 (UTC)

:Indeed. Turing's proof for the halting theorem says that there is no algorithm that allows a Turing machine to determine whether any possible program/input combination will halt. However, this doesn't necessarily mean that it's impossible to develop an algorithm that determines whether a particular, fixed program will halt on an arbitrary input. [[Special:Contributions/141.101.104.141|141.101.104.141]] 08:14, 10 June 2016 (UTC)

Currently, there is no mention of the unmatched square brackets in the synopsis, or unmatched parenthesis in the title text. Presumably a reference to XKCD comic 859. [[Special:Contributions/141.101.98.77|141.101.98.77]] 07:51, 10 June 2016 (UTC)

Attack Mode might be a reference to the [https://en.wikipedia.org/wiki/Yu-Gi-Oh!_Trading_Card_Game Yu-Gi-Oh Trading Card Game] [[Special:Contributions/162.158.85.117|162.158.85.117]] 08:23, 10 June 2016 (UTC)

In the description of -b the computer (Named "Hex") from discworld uses ants not bees.
Ref: https://en.wikipedia.org/wiki/Hex_(Discworld) [[Special:Contributions/141.101.98.125|141.101.98.125]] 09:13, 10 June 2016 (UTC)Bluewhelk
:Hmm. Reading the wiki article further Hex uses a beehive for long term storage! My bad [[Special:Contributions/141.101.98.125|141.101.98.125]] 09:20, 10 June 2016 (UTC)Bluewhelk

"Or best offer" doesn't need to reference a financial offer, it may also mean that anyone offering to reuse the article with an alternative license is allowed to do so. Attack Mode and Stealth Mode seem to me to be references to computer viruses. Stealth Mode is also an option in some applications that can hide their presence when run, often because of malicious behavior, such as remote access tools, keyloggers, etc. Piping is not only used in Unix, it is also common in MS-DOS. Opposite Day has a good explanation on Wikipedia. Literal quote from Wikipedia: "Once Opposite Day is declared, statements mean the opposite of what they usually mean.". --[[Special:Contributions/162.158.222.217|162.158.222.217]] 11:17, 10 June 2016 (UTC)

Is there any evidence that Opposite Day may refer to Cyanide & Happiness? Opposite Day is a fairly well-known concept (at least from what I know growing up in the U.S.), and I don't see any direct connections to the specific C&H video short. I think that speculation should be removed. [[User:Sayno2quat|Sayno2quat]] ([[User talk:Sayno2quat|talk]]) 14:33, 10 June 2016 (UTC)

I could be wrong, but I think the program is also "simulating" a man (a play with the words because it's a '''man''' page). If you think like that a lot more commands makes sense (especially, -D, -e, -f, -g, -jk, -R, -u). Just a penny for a thought. --[[Special:Contributions/108.162.241.134|108.162.241.134]] 11:52, 10 June 2016 (UTC)

If someone wants a history of the useragent string (possibly a reference for that "citation needed"), then [http://webaim.org/blog/user-agent-string-history/|this might be of interest]. --[[User:Draco18s|Draco18s]] ([[User talk:Draco18s|talk]]) 16:12, 10 June 2016 (UTC)

The <code>-n</code> option might be a reference to <code>echo</code>, where it is an option often used but which does not work on all systems. <br>
Am I the only one to see the “k” capitalized in <code>-jK</code>? <br>
[[User:Ltrlg|Ltrlg]] ([[User talk:Ltrlg|talk]]) 18:55, 10 June 2016 (UTC)

I interpreted "CHECK WHETHER INPUT HALTS" as simply determining whether the input was a finite string. (while at the same time referencing the halting problem) --[[Special:Contributions/162.158.68.59|162.158.68.59]] 20:22, 10 June 2016 (UTC)

I think that "suppress bees" probably indicates a smoke situation, a situation where the magic smoke is let out of the computer, such as halt-catch-fire. Smoke is the way to suppress bees. [[Special:Contributions/108.162.249.158|108.162.249.158]] 20:24, 10 June 2016 (UTC)

What does "BSD 4(2)" mean? --[[Special:Contributions/162.158.255.65|162.158.255.65]] 20:54, 10 June 2016 (UTC)

blerp -v | blerp -ha [[User:Mikemk|Mikemk]] ([[User talk:Mikemk|talk]]) 21:28, 10 June 2016 (UTC)

The word "bug" doesn't actually come from an insect; see the Etymology section of https://en.wikipedia.org/wiki/Software_bug [[Special:Contributions/108.162.245.117|108.162.245.117]] 04:37, 11 June 2016 (UTC)

Some remarks to the current explanation:
- I think the description is more specific than suggested. It is true that command-line programs regularly read stdin and output something to stdout, but I would categorize only some of them grep/sed/awk/sort/... as filter in the narrower sense. Also that it can access remote files (URL syntax) is a clue
- In the syntax we have args, option, options, and flags
- the environment variables are never described
- attack mode could refer to a network attack, e.g. trying to break into protected servers, or not just filtering the information, but also using it in a damaging way
- suppress bees hints that for normal operation bees are used, something you would not expect from a typical command line program
- the em dashes are probably used from there on on the command line (right of this option)
- piping output to the MS-DOS debug.exe can be used for entering small assembly programs (including saving them typically as .com command), changing memory contents or accessing I/O ports. Normally it is used interactively. In a pipe setup it enhances the abilities of a text processing filter to do some enhanced actions on the target computer
- execute something, similar to the find program which can execute an external program per match; could also mean a specified algorithm and refer to halting check; in any case "something" is quite vague for a man page
- use google: either for input (e.g. read URLs by searching for ARG and getting the first found webpage) or some special Google API; possibly Google is so powerful, it can replace some of the functionality of the program. Just use Google
- Check whether input halts hints that the input processing including algorithm execution is so complex that it can run into an infinite loop, but easy enough to be not yet Turing complete or it is and -h is the joke; or some input never halts, e.g. /dev/random, or it refers to the robot theory, e.g. whether the attacked victim halts
- ignore case probably refers to the actual input files instead of to the command line
- overwrite would be funny with speech output
- the true pope is seemingly important fir filtering. Could refer to important faith settings for other programs, e.g. which editor to use vim/emacs or it us important for knowledge processing
- randomize arguments is good for some test procedures
- as mentioned in the explanation the copyright refers to the man page, not the program, here the explanation is inconsistent in the current revision
Sebastian --[[Special:Contributions/162.158.83.168|162.158.83.168]] 08:55, 11 June 2016 (UTC)

With reference to the See Also, the multiple blerps are due to different sections, see https://en.wikipedia.org/wiki/Man_page#Manual_sections [[Special:Contributions/173.245.54.34|173.245.54.34]] 13:08, 11 June 2016 (UTC)

Could "supress bees" reference to "[http://www.explainxkcd.com/wiki/index.php/797:_debian-main debian-main]"? [[Special:Contributions/162.158.86.131|162.158.86.131]] 19:20, 11 June 2016 (UTC)

Does the unclosed paren in the title text bother anyone else? [[Special:Contributions/173.245.50.25|173.245.50.25]] 06:02, 12 June 2016 (UTC)
:Not me, but someone somewhere... - [[Special:Contributions/108.162.244.85|108.162.244.85]] 08:41, 12 June 2016 (UTC)

Is the newspaper on this What-If [http://what-if.xkcd.com/61/] relevant? - [[Special:Contributions/108.162.244.85|108.162.244.85]] 08:41, 12 June 2016 (UTC)

I've never put anything on this site, but I feel it's worth mentioning that lerp (which stands for linear interpolation) is a thing and it sounds like blerp. [[Special:Contributions/108.162.245.119|108.162.245.119]] 02:31, 13 June 2016 (UTC)

1. The NAME section is missing the one-line description that is necessary for the whatis and apropos commands.
2. "Set version number" could be used to set the version number in the output files or provide compatibility output.
[[Special:Contributions/108.162.216.98|108.162.216.98]] 02:38, 13 June 2016 (UTC)

Talk:728: iPad

2015-03-11T00:52:44Z

108.162.216.98:

Maybe add something about the tilte text? I would do it myself but I don't undestanrd it so I can't[[Special:Contributions/108.162.240.43|108.162.240.43]] 17:15, 11 December 2014 (UTC)

I tried to fix something for the title, because there was nothing.

728: iPad

2015-03-11T00:51:44Z

108.162.216.98: /* Explanation */

{{comic
| number = 728
| date = April 16, 2010
| title = iPad
| image = ipad.png
| titletext = Maybe we're all gonna die, but we're gonna die in *really cool ways*.
}}

==Explanation==
In this comic, [[Cueball]] is entertained by his {{w|iPad}} because messing around with it is so fun and feels futuristic. [[Megan]] tries to bring perspective to him by telling him that his fun is really not so fun because so many exciting and much more impressive things are to come. Cueball still objects, because that makes him feel that he's too easily impressed by trivial things, and says that Megan is spoiling his fun by trying to make his source of entertainment seem less cool.

The title is of course a nod to all the new ways to die technology will give humanity

==Transcript==
:[Cueball is sitting in an armchair, playing with an iPad. Megan is looking over his shoulder.]
:Cueball: Navigating Google Maps on the iPad is fun. It feels so futuristic.
:Cueball: Swoosh! Zoom!

:Megan: There are, right now, monkeys controlling robotic arms via neural implants.

:Megan: A huge and alien future is barreling toward us. And I can't WAIT.

:Megan: But no, your iPad is cool, too.
:Cueball: Stop spoiling my future with your slightly more distant one.

{{comic discussion}}
[[Category:Comics featuring Megan]]
[[Category:Comics featuring Cueball]]

Talk:1488: Flowcharts

2015-02-19T15:20:38Z

108.162.216.98:

A little bit more of 730? [[Special:Contributions/141.101.80.108|141.101.80.108]] 06:53, 18 February 2015 (UTC)
:More along the lines of 94, 210, 518, 627, 844, 845, and 1195, though I see similarities with 730. [[User:Mikemk|Mikemk]] ([[User talk:Mikemk|talk]]) 07:09, 18 February 2015 (UTC)
How should we do the transcript? [[User:Mikemk|Mikemk]] ([[User talk:Mikemk|talk]]) 07:09, 18 February 2015 (UTC)

You could do the transcript as a number list formatted like: "[Title of item] IF YES(GOTO X), IF NO(GOTO Y)" (where "X" and "Y" are the numbers on the list for the corresponding next option). Derek [[Special:Contributions/108.162.216.107|108.162.216.107]] 13:25, 18 February 2015 (UTC)

I would just like to say that I find some of the linked spiral-images ''very'' disturbing. Although for some they'd be the same even ''without'' the spirals, admitedly. [[Special:Contributions/141.101.98.188|141.101.98.188]] 09:47, 18 February 2015 (UTC)

I believe this will end up being one of the most challenging explanations yet (of those that are completely explicable) - got quite a task up ahead... -- [[User:Brettpeirce|Brettpeirce]] ([[User talk:Brettpeirce|talk]]) 10:35, 18 February 2015 (UTC)

Normally (for a flowchart) the Start symbol should not have an input. The electrical circuit is not a rectifier! Sebastian --[[Special:Contributions/108.162.254.103|108.162.254.103]] 10:59, 18 February 2015 (UTC)
:In the newly corrected version, it is. [[User:Knob creek|Knob creek]] ([[User talk:Knob creek|talk]]) 16:58, 18 February 2015 (UTC)
::But it doesn't need to be, since the rectification is done by the flow chart. Two of the diodes will never be used. (Is it still a rectifier if it's not rectifying?) [[Special:Contributions/108.162.249.182|108.162.249.182]] 21:49, 18 February 2015 (UTC)
:::Yes it's still a rectifier. It just appears to be out of a job, that's all. Anyone else notice that the bridge rectifier IS a flowchart? The two decision trees feeding it are completely unnecessary. Getting rid of them gives the rectifier back it's job! Also, to give Randall a break, the original diagram of the bridge is actually a ring modulator. It's been decades since I've been in RF so I had to track it down and confirm.[[User:ExternalMonolog|ExternalMonolog]] ([[User talk:ExternalMonolog|talk]]) 23:24, 18 February 2015 (UTC)
OCD comment: There appear to be two lines missing, 1) from scatter plots to data or axis, 2) from the bottom of positive or negative DC terminal to the negative terminal of the battery. Also, I would be happier if the two left hand diodes of the full wave rectifier were reversed. {{unsigned ip|173.245.52.95}}

:Scatter plots don't have lines, that's the joke. {{unsigned ip|199.27.133.71}}

Either I was really tired this morning, or the spiral was not actually present in the first version of this comic.[[Special:Contributions/108.162.254.98|108.162.254.98]] 13:00, 18 February 2015 (UTC)

It seems like the options for the "Do you like flowcharts?" box should be reversed (only putting someone through the flowchart if they say they like flowcharts). I think it makes less sense to have the first option "annoy" someone with a flowchart option until they say they don't like flowcharts, then put them through a flowchart. Derek [[Special:Contributions/108.162.216.107|108.162.216.107]] 13:31, 18 February 2015 (UTC)

I see no evidence that the "time or your happiness" box is asking you to "choose whichever you value more". The graph shows your happiness as a function of time, not "your time" (it's not as if you were asked to choose between, say, more happiness or more spare time for yourself). I think it is just asking you to choose which axis of the graph you want to follow. The flowchart for the line graph and the scatter plot are similar; since "X or Y" is not interpreted as a question about value, why should "time or your happiness" be?
Zetfr 14:00, 18 February 2015 (UTC)

The comment on the Fibonacci and Golden Spirals being the same is not correct. According to Wikipedia{{w|Golden_Spiral|[1]}}{{w|Fibonacci_number|[2]}}: "A Fibonacci spiral '''approximates''' the golden spiral using quarter-circle arcs inscribed in squares of integer Fibonacci-number side." - [[User:Prometheusmmiv|Prometheusmmiv]] ([[User talk:Prometheusmmiv|talk]]) 14:55, 18 February 2015 (UTC)

Randall has uploaded a new version, it fixes some missing lines: The scatter graph is now connected, as is the DC terminal, and the battery is now in a circuit. Some of the explaination above needs updating [[Special:Contributions/141.101.99.47|141.101.99.47]] 15:32, 18 February 2015 (UTC)

Clicking on the image takes you to http://xkcd.com/spiral/ {{unsigned ip|108.162.216.149}}
:Good catch about http://xkcd.com/spiral/ ! --[[User:Guest|Guest]] ([[User talk:Guest|talk]]) 17:46, 18 February 2015 (UTC)

'''NOTE''' this comic has been changed, oddly. http://xkcd.com/1488/ [[User:Halfhat|Halfhat]] ([[User talk:Halfhat|talk]]) 18:21, 18 February 2015 (UTC)

How do we change this wiki to have the updated image? The XKCD site is updated, but this page still shows the old image. [[User:Djbrasier|Djbrasier]] ([[User talk:Djbrasier|talk]]) 18:59, 18 February 2015 (UTC)
:I have uploaded the correct version now. [[User:Kynde|Kynde]] ([[User talk:Kynde|talk]]) 19:30, 18 February 2015 (UTC)
:: The image is still out of date as it lacks the Yes / Never! markings on the Path of Least Resistance decision box. [[Special:Contributions/173.245.54.174|173.245.54.174]] 21:00, 18 February 2015 (UTC)

Is it a coincidence that a Fibonacci sequence has a link to the golden ratio? I think not: https://www.youtube.com/watch?v=dTWKKvlZB08 [[User:SirKitKat|sirKitKat]] ([[User talk:SirKitKat|talk]]) 21:08, 18 February 2015 (UTC)

Wow - I tried the random button once and got to this comic: [[1359: Phone Alarm]]. For a second I thought he had rigged it - but that is was not the case. But that was not getting to something else ;-) [[User:Kynde|Kynde]] ([[User talk:Kynde|talk]]) 21:19, 18 February 2015 (UTC)

:I got [[518]] and started laughing all over again. He really should rig the random button on this page to point to only flowchart comics. He has enough of them: [[94]], [[210]], [[518]], [[844]], [[851]], [[854]], [[1066]], [[1195]], [[1359]]. [[Special:Contributions/108.162.216.98|108.162.216.98]] 15:20, 19 February 2015 (UTC)

1486: Vacuum

2015-02-13T10:26:13Z

108.162.216.98: fixed "Beret buy" to Beret guy"

{{comic
| number = 1486
| date = February 13, 2015
| title = Vacuum
| image = vacuum.png
| titletext = Do you think you could actually clean the living room at some point, though?
}}

==Explanation==

According to quantum mechanics there is tremendous energy density in space-time itself: this is known as: [[wikipedia:vacuum energy|vacuum energy]], zero point energy, vacuum foam, etc.
Of course, this energy is not literally available to be tapped.

In the cartoon, Beret Guy appears to be making a silly mistake, confusing the metaphorical 'vacuum' referred to in calculations of the theoretical energy density of space time with the partial vacuum of a vacuum cleaner - a device commonly used to clean dust from households.{{Citation needed}}

Cueball tries to correct him, but it turns out that Beret guy really is able to tap into this fundamental source of energy.

==Transcript==
[Beret guy is holding an upright vacuum cleaner upside-down by the handle, waving it around above his head]

Cueball: What are you doing?

[The vacuum cleaner is upright on the ground, and Beret guy is standing on its body, wiggling the handle]

Beret: Trying to unlock the tremendous energy of the vacuum.

Cueball: That's not what that -

[Beret guy rides the vacuum cleaner as it begins to lift off, propelled upward by an unkown force]

Beret: HA HA! IT WORKS!

Cueball: I said that's -

Beret: The universe is mine to command!!

[Beret guy rides away on the vacuum cleaner]

{{comic discussion}}

[[Category:Comics featuring Beret Guy]]
[[Category:Comics featuring Cueball]]

1394: Superm*n

2014-10-11T06:14:56Z

108.162.216.98: /* Explanation */

{{comic
| number = 1394
| date = July 14, 2014
| title = Superm*n
| image = superm_n.png
| titletext = See also: Spider-Man reboot in which he can produce several inches of web, doesn't need as much chalk powder on his hands when he goes rock climbing, and occasionally feels vaguely uneasy about situations.
}}

==Explanation==
By depicting how unimpressive the superhero {{w|Superman}} would be if his increase in powers, when compared to humans, were the same as the moon's increase in apparent size during a {{w|supermoon}}, Randall points that the use of the term supermoon is an exaggeration.

This comic was posted one day after a supermoon, an informal astronomical event where a full moon occurs when it is closest to earth, causing the moon to appear 10% brighter and about 7% larger. This is due to the {{w|apsidal precession}} of moon's {{w|elliptic orbit}} which has an {{w|orbital eccentricity}} of about 0.0549. The conditions for a supermoon happen once every 411 days, and the loose definition of the term means that the supermoon lasts for about two or three full moons.

Returning back to the not-so-Superman, the average American adult man is 69 inches tall, with a {{w|standard deviation}} of 2.9 inches. Not-so-Superman, at an assumed 74 inches tall, is within the 94th percentile - certainly a tall man, but by no means phenomenal. Basketball players, for sake of example, range an upwards of 80 inches. "7% stronger" (most likely a reference to how the supermoon is 7% brighter) is a bit harder to quantify, but it communicates "not actually impressive" to the reader all the same.

===Title===
The comic's title makes use of an asterisk that is being used as a wildcard. When using search queries an asterisk represents an unknown character, or in some cases a set of characters. Therefore, Superm*n can represent the strings "Superman" and "Supermoon".

===Title Text===
The title text refers makes this same comparison with {{w|Spider-Man}}. Spider man is capable of firing large amounts of webbing, can cling to surfaces with superhuman gripping abilities, and has a sixth sense, "spider sense", that warns him about impending danger. The title text describes trivially minimal versions of these powers, analogous to the trivial size and brightness difference between a "supermoon" and a normal full moon.

==Trivia==
Supermoon has been mentioned previously in [[1080: Visual Field]] and [[1052: Every Major's Terrible]].

==Transcript==
:[Cueball is reaching for an item on a high shelf. Superman is rushing towards him]

:Superman: I'll get it! I'm 5 inches taller and 7% stronger than the average man!

:Caption: The new supermoon-inspired Superman reboot

==References==
<references />

{{comic discussion}}
[[Category:Comics with color]]
[[Category:Comics featuring Cueball]]