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Re: Fast editing of text file? [message #44472 is a reply to message #44469]

Thu, 16 June 2005 01:05

Michael Wallace
Messages: 409
Registered: December 2003

Senior Member

> It might be that the concatenation of these three components could be
> done more quickly by a system command like Unix "cat". In other words
> you would have file_top and file_bottom containing the unchanging bits;
> IDl would write a new version of file_middle each time, then
>
> spawn, "cat file_top file_middle file_bottom > file"
>
> On the other hand it could be slower...

This seems to be pretty fast. I created a three files: file of first 11
lines, file of the 12th line and another file for all the remaining
lines. I made the last file 150,000 lines long just for the fun of it.

$ wc -l upper.txt middle.txt lower.txt
11 upper.txt
1 middle.txt
150000 lower.txt
150012 total
$ date && cat upper.txt middle.txt lower.txt > test.txt; date
Thu Jun 16 02:56:29 CDT 2005
Thu Jun 16 02:56:29 CDT 2005
$ wc -l test.txt
150012 test.txt

So, doing the concatenation took under a second. My machine is good,
but not blazingly fast.

-Mike

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[Message index]

		Re: Fast editing of text file? By: R.Bauer on Sun, 19 June 2005 01:12
		Re: Fast editing of text file? By: Craig Markwardt on Thu, 16 June 2005 07:51
		Re: Fast editing of text file? By: Michael Wallace on Thu, 16 June 2005 01:05
		Re: Fast editing of text file? By: Mark Hadfield on Wed, 15 June 2005 20:28
		Re: Fast editing of text file? By: Andrew Cool on Wed, 15 June 2005 19:55
		Re: Fast editing of text file? By: marc schellens[1] on Wed, 15 June 2005 00:55
		Re: Fast editing of text file? By: Michael Wallace on Tue, 14 June 2005 21:22
		Re: Fast editing of text file? By: t_314159 on Tue, 14 June 2005 17:15
		Re: Fast editing of text file? By: Michael Wallace on Tue, 14 June 2005 16:26

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