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Top Forums UNIX for Advanced & Expert Users Performance problem with removing duplicates in a huge file (50+ GB) Post 302752651 by Kannan K on Monday 7th of January 2013 10:55:16 AM
Old 01-07-2013
Sample Records

Sample records from file:

Code:
14480020180,A20180,A020180,143245765381,A00062,17284171796 
14480020180,A20180,A020180,143245765381,A00062,17284171796 
14480000127,A00127,A000127,143245730649,A00127, 
14480020180,A20180,A020180,143245765381,A00062,17284171796 
14480000127,A00127,A000127,143245730649,A00127, 
14480020180,A20180,A020180,143245765381,A00062,17284171796 
14480042302,A42302,A000127,143245800913,A00127, 
14480020180,A20180,A020180,143245765381,A00062,17284171796 
14480041999,A41999,A000127,143245801337,A00127, 
14480020180,A20180,A020180,143245765381,A00062,17284171796 
14480000163,A00163,A000163,143245730774,A00163,4133403 
14480042302,A42302,A000127,143245800913,A00127,

Desired Output:-
Code:
14480020180,A20180,A020180,143245765381,A00062,17284171796 
14480000127,A00127,A000127,143245730649,A00127, 
14480000163,A00163,A000163,143245730774,A00163,4133403 
14480041999,A41999,A000127,143245801337,A00127, 
14480042302,A42302,A000127,143245800913,A00127,

I also want to add the fact that this file contains 40-50% (20-25 GB) of duplicate records.
And unfortunately, all columns need to considered as part of the key to determine duplicates.

The order of the data (sorted/unsorted) in the resultant file doesn't matter. Only the removal of duplicates is essential.
 

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IGAWK(1)							 Utility Commands							  IGAWK(1)

NAME
igawk - gawk with include files SYNOPSIS
igawk [ all gawk options ] -f program-file [ -- ] file ... igawk [ all gawk options ] [ -- ] program-text file ... DESCRIPTION
Igawk is a simple shell script that adds the ability to have ``include files'' to gawk(1). AWK programs for igawk are the same as for gawk, except that, in addition, you may have lines like @include getopt.awk in your program to include the file getopt.awk from either the current directory or one of the other directories in the search path. OPTIONS
See gawk(1) for a full description of the AWK language and the options that gawk supports. EXAMPLES
cat << EOF > test.awk @include getopt.awk BEGIN { while (getopt(ARGC, ARGV, "am:q") != -1) ... } EOF igawk -f test.awk SEE ALSO
gawk(1) Effective AWK Programming, Edition 1.0, published by the Free Software Foundation, 1995. AUTHOR
Arnold Robbins (arnold@skeeve.com). Free Software Foundation Nov 3 1999 IGAWK(1)
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