explain xkcd - User contributions [en]

Talk:1728: Cron Mail

2016-09-03T06:35:08Z

Renormalist:

I think the "MAILTO" variable in "/etc/crontab" is meant, so only only cron-mails would go to this address, not all mails for the user

[[User:Rincewind|Rincewind]] ([[User talk:Rincewind|talk]]) 13:09, 2 September 2016 (UTC)

The huge question is whether adding an email message to crontab would result in cron producing even more mail - or whether it would cause cron to fail in some way. The latter would do damage by killing some (possibly critical) cron tasks - the former could rapidly fill up the hard drive with an exponentially-growing crontab. An intermediate situation would be that cron simply ignores the junk and continues to function as before - in which case Cueball's change will have little practical impact on disk space consumption - but probably gradually slow cron's crontab parser to a crawl, which would also have rather severe effects. On most Linux setups, the mail directories are on a different partition to /etc. There is often very little spare space on the partition with /etc on it - so it's likely that Cueball's change will eventually do terrible damage in that case too. [[Special:Contributions/162.158.69.98|162.158.69.98]] 14:42, 2 September 2016 (UTC)
:On my Mint/Ubuntu/Debian-based Linux system, adding junk to /etc/crontab put a message is /var/log/syslog about "cron[1495]: (*system*) ERROR (Syntax error, this crontab file will be ignored)". So it looks like appending garbage to the crontab will just break cron entirely (or at least those handled by /etc/crontab; it may be private cron and /etc/cron.d/* jobs may continue to run, but cron.hourly, cron.daily, and cron.weekly jobs on my system are initiated through /etc/crontab so they would not run with a broken /etc/crontab). I don't know if other non-Debian distributions have a cron that behaves differently, however. [[User:N0lqu|-boB]] ([[User talk:N0lqu|talk]]) 15:18, 2 September 2016 (UTC)
:Seems like it wouldn't break the existing stuff, they'd still get run and then cron would start parsing the noise and complaining - the "intermediate" situation, though the "export MAILTO" seems wrong. If Cueball did it in his .bashrc, it might get into some of *his* cron jobs but unless it's in /etc/crontab (and there, no "export" is needed/used), it wouldn't matter. His jobs probably wouldn't have rights to write to /etc/crontab either. [[Special:Contributions/173.245.48.73|173.245.48.73]] 17:09, 2 September 2016 (UTC)

The current explanation misses a part of the joke present in Cueball's last statement: he is considering the cron program to be somehow sentient and able to make a decision between sending the email (is it really important?) and its self-preservation by not trashing its own config file. He is thus daring cron to continue sending emails at the risk of 'self-destruction'.

- I also feel like the part of the joke is the cron has been sending him useless mail for 15 years. So now, he is sending cron useless mail

This states it can be run as infrequently as once a year, however by using February 29th, you can have it run once every 4 years (exc ever 100 inc every 400). But I think you might be able to get better by also setting it to run on a day of the week. e.g. February 29th, which is a Monday, which would then (after this year) not run for another 28 years, next running on February 29th, 2044.

Should that be noted in the article or is it a needless complication? (Also, I don't know what day of the week is what for this syntax).[[Special:Contributions/108.162.250.156|108.162.250.156]] 21:13, 2 September 2016 (UTC)
:That's interesting! but I don't think it's relevant to the joke. [[User:NotLock|NotLock]] ([[User talk:NotLock|talk]]) 23:13, 2 September 2016 (UTC)

:If you specify a day of week and a day of month it runs on both, so "11 59 29 2 1" would run at 11:59 on every Monday in February, as well as on February 29, not just on any February 29 that happened to be a Monday.--[[Special:Contributions/108.162.219.11|108.162.219.11]] 05:18, 3 September 2016 (UTC)

I'm hesitant to make substantial edits as a random non-registered IP address, but I do feel like this explanation could be improved if a lot of the technical details were removed. For example, the format of a crontab file and how it is parsed distracts a bit from the joke. For a non-technical audience, it would be much more concise to simply note that the file has a specific format, and piping random emails to it would probably break all of cron. In my opinion, the current explanation loses the forest for the trees. For me, the key part of the joke is Cueball doesn't know cron, Ponytail explains it, Cueball conducts a response which is intuitive in the real world ("okay, cron, if you think it's that important then you deal with it!") which would be horrible in a computer. Ponytail's comment on it being harsh, and that it would accidentally solve the problem is the punchline. I think all the other technical details distracts from that simple explanation.
: I would agree. Understanding how exactly cron works isn't really necessary to understand the comic and its humor. Perhaps linking to some "cron for dummies" tutorial for those interested[[Special:Contributions/141.101.91.223|141.101.91.223]] 04:03, 3 September 2016 (UTC)

What exactly does "hardball" mean? Is it a US slang term or such?[[Special:Contributions/141.101.91.223|141.101.91.223]] 04:03, 3 September 2016 (UTC)
:"Playing hardball" is an idiom, meaning "to act strong & aggressive about an issue" [[Special:Contributions/108.162.245.114|108.162.245.114]] 05:23, 3 September 2016 (UTC)

With "YOUR MOVE, CRON." Cueball adapts a famous movie quote ("Your move, creep.") from Robocop (1987) as if he would strike back against "the machine" from a similar age (admitted, cron is slightly older, but then again Robocop also plays 20 minutes into the future). [[User:Renormalist|Renormalist]] ([[User talk:Renormalist|talk]]) 06:35, 3 September 2016 (UTC)

Talk:1489: Fundamental Forces

2015-02-20T11:12:55Z

Renormalist:

«The off-panel audience, probably a student or class, is interested, but quickly begins to realize Cueball's lack of understanding. Instead of acknowledging the problem directly, Cueball simply blusters onwards.»

My interpretation is rather different. It looks like Cueball is a physicist who knows that the distinction of "four fundamental forces" is basically wrong/obsolete (the term "force" is not even used anymore in theoretical physics), but since his audience are high school students, he can't go into the many complex details underlying the fundamental interactions, and therefore is forced to gloss over it. This is confirmed by the title text (if Cueball didn't understand the theory of fundamental interactions, he wouldn't give that answer). --[[Special:Contributions/188.114.101.78|188.114.101.78]] 10:31, 20 February 2015 (UTC)

To me it appeared as a typical exam situation for Cueball with '''him''' being the pupil. And ironically that situation looks similar to the real scientific understanding of the topic. [[User:Renormalist|Renormalist]] ([[User talk:Renormalist|talk]]) 11:12, 20 February 2015 (UTC)

Talk:1482: NowPlaying

2015-02-04T16:45:04Z

Renormalist:

So what song is it? [[Special:Contributions/108.162.242.10|108.162.242.10]] 06:11, 4 February 2015 (UTC)
:I believe it is the Main Theme from Jurassic Park. --[[User:Duhsn|Duhsn]] ([[User talk:Duhsn|talk]]) 06:13, 4 February 2015 (UTC)
:If you have good ears you can check for yourself: [https://www.youtube.com/watch?v=-w-58hQ9dLk Link] --[[Special:Contributions/108.162.254.134|108.162.254.134]] 09:05, 4 February 2015 (UTC)
:Nope, not even close. Wrong notes, wrong key (although that doesn't matter as much, could be transposed). Though I thought it was the little bit at the end of "This Old Man", but the last 3 notes don't make sense, and when I try to play it, the first A doesn't quite work (also found sheet music, and that first A should be a B, confirmed). Oh well. - Mikowmer --[[Special:Contributions/108.162.249.218|108.162.249.218]] 11:26, 4 February 2015 (UTC)
:Might it be the folk melody "Country Gardens"? See the Wikipedia entry or look it up one of the many performances on Youtube (there's a charming performance with the Muppets Rowlf and Fozzie Bear) [[Special:Contributions/188.114.103.238|188.114.103.238]] 14:14, 4 February 2015 (UTC)

E major, is a chord, not a note...[[Special:Contributions/108.162.249.169|108.162.249.169]] 06:36, 4 February 2015 (UTC)
You can listen to the sequence of notes here: http://onlinesequencer.net/65475
(All notes the same length, and just guessing which octave each should be in...) [[Special:Contributions/108.162.249.169|108.162.249.169]] 06:36, 4 February 2015 (UTC)
:Just because I want to get it stuck in your head :D, Added a bit to the beginning and end and changed octaves. http://onlinesequencer.net/65487 --[[User:Duhsn|Duhsn]] ([[User talk:Duhsn|talk]]) 07:40, 4 February 2015 (UTC)

The image on this page is NOT the same one as on the actual xkcd page. The original comic does not contain the reference to E Major. [[User:Andries|Andries]] ([[User talk:Andries|talk]]) 07:42, 4 February 2015 (UTC)Andries

Is he rick rolling us? [[Special:Contributions/199.27.128.182|199.27.128.182]] 07:48, 4 February 2015 (UTC)
:He must have agreed with your comment about E major not being a note and changed it. --[[User:Duhsn|Duhsn]] ([[User talk:Duhsn|talk]]) 07:54, 4 February 2015 (UTC)

"and his friends Mike and Caitlin appear to be becoming concerned about his choice of music"... really? I thought they were upset that they were getting spammed by a post every second or so?
"and the notion that someone could become concerned about you based on a list of notes is even more ridiculous."... similarly, not so ridiculous if they're concerned about you spamming them with too many postings!
Finally, "The comic's title alludes to the fact that you can "play a song" but can also "play a note." It may also allude to the visual similarities between the hash/pound/number sign (#) and the sharp sign (♯)."... I don't get either of these references. The hash/sharp comparison is cute, except that the sharp sign doesn't appear in the comic. I took it as a simple extension of the usual someone is listening to some song messages linking to searches for that song "on various online music stores" if you click on them... that is, if you click on a particular note, it'll link to a search for songs that include that note - equally as useless as posting the individual notes of a song in the first place.
Extra-finally, I'd love to see Mike & Caitlin's reactions if Brian listened to anything with a glissando...
Haven't made any of these as changes as I'm not sure they're more than just my own opinion. [[Special:Contributions/108.162.249.220|108.162.249.220]] 07:55, 4 February 2015 (UTC)
:Okay, so I've redone the second paragraph for facts, but haven't touched any of the other opinion bits. [[Special:Contributions/108.162.249.220|108.162.249.220]] 08:40, 4 February 2015 (UTC)

Text may also be a reference to an old joke about a composer who writes, and copyrights, a composition consisting of a single note: middle C. All other composers who later included middle C would thus be quoting his composition, entitling him to royalties; all composers who used any OTHER note would be simply transposing the original composition into another key, and would still owe the royalty..." {{unsigned ip|108.162.215.112}}

I've changed the thing about Mike & Caitlin being concerned about music choice, as this is (as noted by other commentators) *much* less likely than their being concerned about having their news feeds spammed.[[Special:Contributions/141.101.98.135|141.101.98.135]] 09:25, 4 February 2015 (UTC)

Would the Axis of Awesome 4 Chords song be a proper citation to prove many (pop) songs are made up of the same chords? Link of their youtube: http://youtu.be/oOlDewpCfZQ I think it would be funny, at least. [[Special:Contributions/173.245.53.192|173.245.53.192]] 14:03, 4 February 2015 (UTC)

Why are the times out of order? [[Special:Contributions/108.162.213.41|108.162.213.41]] 14:59, 4 February 2015 (UTC)

Brian's system or the one hat runs the social network might run on an older Version of Xen, so it gets "time went backwards" isses (e.g., http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=195) and therefore wrong timestamps. Do we require to re-order the notes accordingly? [[User:Renormalist|Renormalist]] ([[User talk:Renormalist|talk]]) 16:09, 4 February 2015 (UTC)

Btw, I interpreted Mike's comment not as annoyance about the entry flooding but that he can "hear" the melody in his head (like Beethoven) and hears a wrong tune. And maybe it's a small special community (like in xkcd/1305, which would also fit to the timestamp issues they have) so he starts discussing that wrong tune. [[User:Renormalist|Renormalist]] ([[User talk:Renormalist|talk]]) 16:45, 4 February 2015 (UTC)

User:Renormalist

2015-02-04T16:19:38Z

Renormalist: avoid dangling userpage links by creating one

* http://renormalist.net

Talk:1482: NowPlaying

2015-02-04T16:09:32Z

Renormalist: