| --- Log opened Sun Feb 14 00:00:39 2010 |
| 00:04 | < celticminstrel> | My terminal insists on intercepting home, end, page-up, and page-down, even though I removed those key bindings from the preferences... |
| 00:33 | | You're now known as TheWatcher[T-2] |
| 00:35 | | You're now known as TheWatcher[zZzZ] |
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| 02:02 | < celticminstrel> | Whoa. Apparently some of my minor problems resulted from using the print statement in Curses. |
| 02:02 | < celticminstrel> | Well, actually, all the minor problems. |
| 02:02 | <@McMartin> | Oho, yes, bad times |
| 02:02 | < celticminstrel> | Even though I added \r to the string. |
| 02:05 | <@McMartin> | Messes with the cursor position, IIRC. |
| 02:05 | <@McMartin> | sprintf, then addstr(?) or somesuch. |
| 02:05 | < celticminstrel> | Well, Python, so the % operator and addstr. |
| 02:10 | < celticminstrel> | Perhaps this experience will help me if/when I get around to porting that maze game I wrote using Windows conio. |
| 02:42 | <@Derakon> | Hmph. |
| 02:42 | <@Derakon> | I find it a bit annoying that `sort foo.txt > foo.txt` destroys foo.txt instead of sorting it in-place. |
| 02:43 | <@McMartin> | Isn't there a -i or something for that? |
| 02:44 | <@Derakon> | -i is ignore nonprinting characters. |
| 02:44 | <@Derakon> | I don't see a flag that causes it to be careful with output. |
| 02:44 | <@McMartin> | Ah. Boo. |
| 02:44 | <@McMartin> | Sed has an "in-place" |
| 02:45 | < celticminstrel> | Could you do something strange like sort foo.txt | cat > foo.txt, or do pipes not work like that? |
| 02:45 | <@McMartin> | It's sort < foo.txt > foo-sorted.txt |
| 02:45 | <@McMartin> | This is actually an issue with the shell |
| 02:46 | <@McMartin> | If you do sort < foo.txt > foo.txt, the " > foo.txt" annihilates foo.txt before sort even starts |
| 02:46 | < celticminstrel> | If you pipe several commands together, do they run in sequence or simultaneously? |
| 02:46 | <@McMartin> | "Yes" |
| 02:47 | < celticminstrel> | ...? |
| 02:47 | < Namegduf> | Haha, that's mean, McMartin. |
| 02:47 | <@McMartin> | All the processes start at once, but they'll block unless their standard input has something to work on, which means that the step before it has to be outputting things |
| 02:47 | < celticminstrel> | So, simultaneously. |
| 02:47 | <@McMartin> | This means that while they start simultaneously, in most cases where you'd actually *do* this - because the process is "read, process, output", they end up running in sequence. |
| 02:48 | <@Derakon> | Program B will only run if program A is generating output. |
| 02:48 | <@Derakon> | In the case of sort, program A only starts generating once it's read the entire file. |
| 02:48 | <@Derakon> | If program A were sed, though, then it could permute each line as it passes through and then hand it off immediately to program B. |
| 02:49 | <@McMartin> | So a chain of seds would be running and all doing their thing line by line. |
| 02:49 | <@McMartin> | Pipe buffers may play games with this too, and I'm not sure if there are anti-deadlock measures that interact between these |
| 02:49 | <@McMartin> | (Like, if an internal filter doesn't read because it's waiting on network input instead before it starts to do the read or something) |
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| 10:53 | < guest> | Morning! ^^ |
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| --- Log closed Mon Feb 15 00:00:40 2010 |