I would like reading first 3 charcters from dat file and need to creat a new file based on the reading. Assume in dat file first 3 charcters would be "abc" .that entire record needs to be extract in to a new file and remove the record from that dat file.
I'm not sure we have grasped the requirement here and I'm not sure if I understand it either, but I will have a go and you can tell me if I'm miles off the mark:-
I coded the string chopping in ksh internal variable commands to avoid the overhead of starting processes (cut etc.) and the IO of writing to too many temporary files. If there is a neater way to remove a record from a file, I would like to know. I did toy with:-
...but that can run in to problems if it is a large (wide) file or contains non-displayable data. It's a problem I get annoyed at a lot.
If you are thinking of writing a loop to process the whole file, you might be better to try one of these:-
It could be sensible to truncate/remove the target files before you begin with these if you just want the output from this run. This is a neat way to acheive that:
You could add
... to get an overwriting line count as you progress. It will slow it down a bit but you should see the file name changing as the count runs. The "\r\c" will cause it to re-write the line with the next display.
There may also be a way to blend these all together
This may give better performance from less IO and fewer processes, but perhaps the extereme could be
You would have to try out the variations to see which performs best given the variety of IO, spawned proceses etc.
I hope that this is somewhere near what you are after. Apologies if I've missed the point. Code has been raw typed, so there may be snytax errors I suppose, but have a go and let me know how you get on.
Robin
Blackburn/liverpool
UK
Last edited by rbatte1; 11-01-2010 at 09:51 AM..
Reason: Some spelling
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