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Full Discussion: Huge files manipulation
Top Forums UNIX for Advanced & Expert Users Huge files manipulation Post 302255895 by Klashxx on Friday 7th of November 2008 10:20:24 AM
Old 11-07-2008
Many thanks for your ideas..
Quote:
I am thinking here...
based on the first position character, copy all lines with "^[aA]" to file_a by using grep (for instance)
repeat for bB and cC and so on

then do your dup check (sort -u maybe) on each of 26 files

finally, recombine the 26 files
Nice i one .. but i want to use the split tools as last option.

Quote:
If your key first character is not highly redundant you can try this with awk.
The idea is predicated on your original code blowing the limits for a hash
Definitely a good trick , but the file content is a little messy ...

Quote:
I wonder, will the duplicated lines always follow each other, or are they spread around in the file?
Unfortunately it is unsorted, and the duplicated keys are in a random order.

chatwizrd, Doesn't work , .. out of memory.

..To clarify, this is the structure of the file:

Code:
30xx|000009925000194653|00000000000000|20081031|02510|00000005445363|01|F|0207|00|||+0005655,00|||+0000000000000,00
30xx|000009925000194653|00000000000000|20081031|02510|00000005445363|01|F|0207|00|||+0000000000000,00|||+0000000000000,00
30xx|4150010003502043|CARDS|20081031|MP415001|00000024265698|01|F|1804|00|||+0000000000000,00|||+0000000000000,00

Having a key formed by the first 7 fields i want to print or delete only the duplicates.

I 'm very new to perl, but i read somewhere tha Tie::File module can handle very large files , i tried but cannot get the right code...
Any ideas?

Thank you in advance.

Regards
 

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LEARN ABOUT ULTRIX

ppmtopgm

ppmtopgm(1)						      General Commands Manual						       ppmtopgm(1)

NAME

       ppmtopgm - convert a portable pixmap into a portable graymap

SYNOPSIS

       ppmtopgm [ppmfile]

DESCRIPTION

       Reads  a  portable  pixmap  as  input.  Produces a portable graymap as output.  The output is a "black and white" rendering of the original
       image, as in a black and white photograph.  The quantization formula used is .299 r + .587 g + .114 b.

       Note that although there is a pgmtoppm program, it is not necessary for simple conversions from pgm to ppm , because any  ppm  program  can
       read  pgm  (and	pbm  ) files automatically.  pgmtoppm is for colorizing a pgm file.  Also, see ppmtorgb3 for a different way of converting
       color to gray.  And ppmdist generates a grayscale image from a color image, but in a way that makes it easy to differentiate  the  original
       colors, not necessarily a way that looks like a black and white photograph.

QUOTE

       Cold-hearted orb that rules the night
       Removes the colors from our sight
       Red is gray, and yellow white
       But we decide which is right
       And which is a quantization error.

SEE ALSO

       pgmtoppm(1),ppmtorgb3(1),rgb3toppm(1),ppmdist(1),ppm(5),pgm(5)

AUTHOR

       Copyright (C) 1989 by Jef Poskanzer.

								   10 April 2000						       ppmtopgm(1)
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