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Re: query: how many use PHP for linux scripts [message #185968 is a reply to message #185964]

Thu, 15 May 2014 16:48

The Natural Philosoph
Messages: 993
Registered: September 2010

Karma:

Senior Member

On 15/05/14 17:13, crankypuss wrote:
> On 05/15/2014 07:52 AM, The Natural Philosopher wrote:
>> On 15/05/14 13:34, Jasen Betts wrote:
>>> including files with lines larger than RAM + swap.
>>
>> THAT is challenge!
>>
>> Have to use temporary files..
>>
>>
>
> Whatever for? You need enough "disk" space to contain the input file
> and the output file, you need enough memory to contain the two largest
> contiguous records

but in the case specified, you dont have that space.

and the code to read-2-(swap-2)-write-2. Whether the
> swap involves actual data movement or not is a nit, it boils down to a
> file-copy 2 lines at a time. (Wouldn't surprise me if the "cp" command
> has some option for this kind of thing along with the rest of the
> kitchen sink... or is that "tar" that I'm thinking of...)
>
> Unless of course I'm missing something, I'm feeling stupider with each
> post about this exercise that I read. <g>

"*lines* larger than RAM + swap" is the key.

you need to essentially read through the input file and tag where the
line begins and ends are.

THEN start reading it sequentially from the tag marks and assembling the
output a few megabytes at a time

i.e. you will end up wit at worst enough storage needed to hold an array
of 'line start and end' offsets in the original file.

Or if space is REALLY tight you do it the way COBOL used to do things.
Yuu scan the file to the first line end and then write thet second line
out, too the new file, then store that location as line 3, and write
line one to the tail of file 2, and so on

The point is that's fairly trivial with C. It doesn't ENFORCE a
particular way of dealing with files on you.

And C with a good library can be really high level too.

BUT if that doesn't work for you, no problem in going near to the
hardware either.

--
Ineptocracy

(in-ep-toc’-ra-cy) – a system of government where the least capable to
lead are elected by the least capable of producing, and where the
members of society least likely to sustain themselves or succeed, are
rewarded with goods and services paid for by the confiscated wealth of a
diminishing number of producers.

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[Message index]

		query: how many use PHP for linux scripts By: crankypuss on Tue, 13 May 2014 08:17
		Re: query: how many use PHP for linux scripts By: Arno Welzel on Tue, 13 May 2014 08:37
		Re: query: how many use PHP for linux scripts By: Tim Streater on Tue, 13 May 2014 10:52
		Re: query: how many use PHP for linux scripts By: Auric__ on Tue, 13 May 2014 13:28
		Re: query: how many use PHP for linux scripts By: Jonathan N. Little on Tue, 13 May 2014 14:29
		Re: query: how many use PHP for linux scripts By: Collin Pruitt on Tue, 13 May 2014 15:00
		Re: query: how many use PHP for linux scripts By: crankypuss on Tue, 13 May 2014 16:05
		Re: query: how many use PHP for linux scripts By: Johnny on Tue, 13 May 2014 16:32
		Re: query: how many use PHP for linux scripts By: The Natural Philosoph on Tue, 13 May 2014 18:09
		Re: query: how many use PHP for linux scripts By: Tim Streater on Tue, 13 May 2014 20:35
		Re: query: how many use PHP for linux scripts By: JEDIDIAH on Tue, 13 May 2014 21:10
		Re: query: how many use PHP for linux scripts By: Tim Streater on Tue, 13 May 2014 22:03
		Re: query: how many use PHP for linux scripts By: Jerry Stuckle on Tue, 13 May 2014 23:55
		Re: query: how many use PHP for linux scripts By: Chris Ahlstrom on Wed, 14 May 2014 00:26
		Re: query: how many use PHP for linux scripts By: Jerry Stuckle on Wed, 14 May 2014 00:37
		Re: query: how many use PHP for linux scripts By: crankypuss on Wed, 14 May 2014 09:18
		Re: query: how many use PHP for linux scripts By: Jerry Stuckle on Wed, 14 May 2014 12:20
		PHP Gui Toolkits (was: query: how many use PHP for linux scripts) By: Christoph Michael Bec on Wed, 14 May 2014 12:58
		Re: PHP Gui Toolkits By: crankypuss on Thu, 15 May 2014 08:04
		Re: PHP Gui Toolkits By: Christoph Michael Bec on Thu, 15 May 2014 12:38
		Re: PHP Gui Toolkits By: The Natural Philosoph on Thu, 15 May 2014 12:59
		Re: query: how many use PHP for linux scripts By: crankypuss on Thu, 15 May 2014 08:01
		Re: query: how many use PHP for linux scripts By: Chris Ahlstrom on Wed, 14 May 2014 10:40
		Re: query: how many use PHP for linux scripts By: Jerry Stuckle on Wed, 14 May 2014 12:23
		Re: query: how many use PHP for linux scripts By: crankypuss on Wed, 14 May 2014 09:00
		Re: query: how many use PHP for linux scripts By: JEDIDIAH on Wed, 14 May 2014 19:49
		Re: query: how many use PHP for linux scripts By: crankypuss on Wed, 14 May 2014 08:44
		Re: query: how many use PHP for linux scripts By: The Natural Philosoph on Wed, 14 May 2014 09:17
		Re: query: how many use PHP for linux scripts By: crankypuss on Wed, 14 May 2014 09:39
		Re: query: how many use PHP for linux scripts By: Tim Streater on Wed, 14 May 2014 11:29
		Re: query: how many use PHP for linux scripts By: JEDIDIAH on Wed, 14 May 2014 19:54
		Re: query: how many use PHP for linux scripts By: The Natural Philosoph on Wed, 14 May 2014 20:50
		Re: query: how many use PHP for linux scripts By: Jerry Stuckle on Thu, 15 May 2014 02:49
		Re: query: how many use PHP for linux scripts By: JEDIDIAH on Thu, 15 May 2014 14:45
		Re: query: how many use PHP for linux scripts By: The Natural Philosoph on Thu, 15 May 2014 16:35
		Re: query: how many use PHP for linux scripts By: crankypuss on Thu, 15 May 2014 08:07
		Re: query: how many use PHP for linux scripts By: Jonathan N. Little on Thu, 15 May 2014 11:58
		Re: query: how many use PHP for linux scripts By: crankypuss on Thu, 15 May 2014 15:55
		Re: query: how many use PHP for linux scripts By: Jerry Stuckle on Thu, 15 May 2014 12:08
		Re: query: how many use PHP for linux scripts By: crankypuss on Thu, 15 May 2014 16:04
		Re: query: how many use PHP for linux scripts By: The Natural Philosoph on Wed, 14 May 2014 03:42
		Re: query: how many use PHP for linux scripts By: crankypuss on Wed, 14 May 2014 09:21
		Re: query: how many use PHP for linux scripts By: The Natural Philosoph on Wed, 14 May 2014 11:32
		Re: query: how many use PHP for linux scripts By: Ben Bacarisse on Wed, 14 May 2014 12:39
		Re: query: how many use PHP for linux scripts By: The Natural Philosoph on Wed, 14 May 2014 14:23
		Re: query: how many use PHP for linux scripts By: Christoph Michael Bec on Wed, 14 May 2014 18:00
		Re: query: how many use PHP for linux scripts By: The Natural Philosoph on Wed, 14 May 2014 20:48
		Re: query: how many use PHP for linux scripts By: Ben Bacarisse on Wed, 14 May 2014 21:18
		Re: query: how many use PHP for linux scripts By: The Natural Philosoph on Wed, 14 May 2014 22:10
		Re: query: how many use PHP for linux scripts By: Ben Bacarisse on Wed, 14 May 2014 21:05
		Re: query: how many use PHP for linux scripts By: The Natural Philosoph on Wed, 14 May 2014 22:07
		Re: query: how many use PHP for linux scripts By: Jerry Stuckle on Thu, 15 May 2014 02:51
		Re: query: how many use PHP for linux scripts By: Jasen Betts on Thu, 15 May 2014 12:34
		Re: query: how many use PHP for linux scripts By: The Natural Philosoph on Thu, 15 May 2014 13:52
		Re: query: how many use PHP for linux scripts By: crankypuss on Thu, 15 May 2014 16:13
		Re: query: how many use PHP for linux scripts By: The Natural Philosoph on Thu, 15 May 2014 16:48
		Re: query: how many use PHP for linux scripts By: crankypuss on Fri, 16 May 2014 07:12
		Re: query: how many use PHP for linux scripts By: Jasen Betts on Fri, 16 May 2014 11:29
		Re: query: how many use PHP for linux scripts By: The Natural Philosoph on Fri, 16 May 2014 12:03
		PHP integers (was: query: how many use PHP for linux scripts) By: Christoph Michael Bec on Fri, 16 May 2014 12:16
		Re: query: how many use PHP for linux scripts By: Jerry Stuckle on Thu, 15 May 2014 14:03
		Re: query: how many use PHP for linux scripts By: Ben Bacarisse on Thu, 15 May 2014 15:26
		Re: query: how many use PHP for linux scripts By: crankypuss on Thu, 15 May 2014 16:07
		Re: query: how many use PHP for linux scripts By: The Natural Philosoph on Thu, 15 May 2014 16:37
		Re: query: how many use PHP for linux scripts By: Christoph Michael Bec on Thu, 15 May 2014 17:14
		Re: query: how many use PHP for linux scripts By: Ben Bacarisse on Fri, 16 May 2014 01:45
		Re: query: how many use PHP for linux scripts By: The Natural Philosoph on Fri, 16 May 2014 08:25
		Re: query: how many use PHP for linux scripts By: Jerry Stuckle on Fri, 16 May 2014 13:14
		Re: query: how many use PHP for linux scripts By: crankypuss on Fri, 16 May 2014 07:17
		Re: query: how many use PHP for linux scripts By: Thomas 'PointedEars' on Thu, 15 May 2014 17:33
		Re: query: how many use PHP for linux scripts By: crankypuss on Wed, 14 May 2014 08:36
		Re: query: how many use PHP for linux scripts By: The Natural Philosoph on Wed, 14 May 2014 09:09
		Re: query: how many use PHP for linux scripts By: crankypuss on Wed, 14 May 2014 09:58
		Re: query: how many use PHP for linux scripts By: Allodoxaphobia on Tue, 13 May 2014 21:23
		Re: query: how many use PHP for linux scripts By: Mike Yetto on Tue, 13 May 2014 23:02
		Re: query: how many use PHP for linux scripts By: crankypuss on Wed, 14 May 2014 09:24
		Re: query: how many use PHP for linux scripts By: Mike Yetto on Wed, 14 May 2014 21:23
		Re: query: how many use PHP for linux scripts By: Jerry Stuckle on Thu, 15 May 2014 02:53
		Re: query: how many use PHP for linux scripts By: crankypuss on Thu, 15 May 2014 08:13
		Re: query: how many use PHP for linux scripts By: Chris Ahlstrom on Thu, 15 May 2014 10:09
		Re: query: how many use PHP for linux scripts By: crankypuss on Thu, 15 May 2014 16:16
		Re: query: how many use PHP for linux scripts By: Thomas 'PointedEars' on Thu, 15 May 2014 16:49
		Re: query: how many use PHP for linux scripts By: Jasen Betts on Fri, 16 May 2014 12:02
		Re: query: how many use PHP for linux scripts By: crankypuss on Fri, 16 May 2014 14:17
		init-system, bash, etc. (was: query: how many use PHP for linux scripts) By: Christoph Michael Bec on Fri, 16 May 2014 16:48
		Re: query: how many use PHP for linux scripts By: Mike Yetto on Thu, 15 May 2014 12:02
		Re: query: how many use PHP for linux scripts By: Aragorn on Thu, 15 May 2014 01:16
		Re: query: how many use PHP for linux scripts By: crankypuss on Tue, 13 May 2014 18:20
		Re: query: how many use PHP for linux scripts By: Johnny on Tue, 13 May 2014 18:35
		Re: query: how many use PHP for linux scripts By: Mike Yetto on Tue, 13 May 2014 23:04
		Re: query: how many use PHP for linux scripts By: crankypuss on Wed, 14 May 2014 09:26
		Re: query: how many use PHP for linux scripts By: Jerry Stuckle on Wed, 14 May 2014 12:28
		Re: query: how many use PHP for linux scripts By: The Natural Philosoph on Tue, 13 May 2014 16:26

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