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Full Discussion: CSV file:Find duplicates, save original and duplicate records in a new file
Top Forums UNIX for Dummies Questions & Answers CSV file:Find duplicates, save original and duplicate records in a new file Post 302536530 by Corona688 on Tuesday 5th of July 2011 04:27:07 PM
Old 07-05-2011
Does your data really have all those blank lines in it?

---------- Post updated at 02:27 PM ---------- Previous update was at 02:24 PM ----------

Assuming it doesn't actually have all those extra blank lines:

Code:
#!/bin/sh

COL=4

# Break file into livable chunks
split -C 100K < megadata.txt

for FILE in ???
do
        sort -k $COL < "${FILE}" > "${FILE}.tmp"
        rm -f "${FILE}"
        mv "${FILE}.tmp" "${FILE}"
        shift
done

sort -k $COL -m ??? | awk -v COL=${COL} '{
        if($COL == LAST)
        {
                if(orig)
                {       print orig;     orig="";        }

                print;
        }
        else
        {
                LAST=$COL;
                orig=$0;
        }

                }' > output.txt
rm -f x??

Will find
Code:
900278VG567 2010-06-2 ABC QVA697C8LAYMACBF
900278VGA4T 2010-06-2 ABC QVA697C8LAYMACBF

based on your input data.

I don't know of a way to do both columns at once. That'd bring you back to the original problem of needing to store everything in memory at once to tell if there were duplicates.
Last edited by Corona688; 07-05-2011 at 05:45 PM..
This User Gave Thanks to Corona688 For This Post:
arvindosu
 

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LEARN ABOUT CENTOS

file::homedir::unix

File::HomeDir::Unix(3)					User Contributed Perl Documentation				    File::HomeDir::Unix(3)

NAME

       File::HomeDir::Unix - Find your home and other directories on legacy Unix

SYNOPSIS

	 use File::HomeDir;

	 # Find directories for the current user
	 $home	  = File::HomeDir->my_home;	   # /home/mylogin
	 $desktop = File::HomeDir->my_desktop;	   # All of these will...
	 $docs	  = File::HomeDir->my_documents;   # ...default to home...
	 $music   = File::HomeDir->my_music;	   # ...directory
	 $pics	  = File::HomeDir->my_pictures;    #
	 $videos  = File::HomeDir->my_videos;	   #
	 $data	  = File::HomeDir->my_data;	   #

DESCRIPTION

       This module provides implementations for determining common user directories.  In normal usage this module will always be used via
       File::HomeDir.

SUPPORT

       See the support section the main File::HomeDir module.

AUTHORS

       Adam Kennedy <adamk@cpan.org>

       Sean M. Burke <sburke@cpan.org>

SEE ALSO

       File::HomeDir, File::HomeDir::Win32 (legacy)

COPYRIGHT

       Copyright 2005 - 2011 Adam Kennedy.

       Some parts copyright 2000 Sean M. Burke.

       This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

       The full text of the license can be found in the LICENSE file included with this module.

perl v5.16.3							    2012-10-19						    File::HomeDir::Unix(3)
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