I created this for you so you have something you can start playing with. I think it already does what you want. It works by creating a hash with keys and it depends on the fact that a hash key has to be unique and you can use 'exists' to see if the key already exists.

use strict ;
use warnings ;

while(<DATA>) {
    chomp ;
    my @values = split(',', $_) ;
    # print "values = @values\n" ;
    processKey( @values ) ;
}

my $foundKeys = {} ;

sub processKey {
    my $key = $_[0] ;
    my $col2 = $_[1] ;
    my $col3 = $_[2] ;
    my $col4 = $_[3] ;
    my $col5 = $_[4] ;
    my $col6 = $_[5] ;
    
    if ( exists $foundKeys->{ $key } ) {
        # skip
    } else {
        $foundKeys->{ $key } = 1 ;
        print "$key $col2 $col3 $col4 $col5 $col6\n" ;
    }
}

__DATA__
key_683,march,29031990,ABCD_FH,9,9
key_684,march,29031990,ABCD_FH,9,9
key_685,march,29031990,ABCD_FH,9,9
key_686,march,29031990,ABCD_FH,9,9
key_687,march,29031990,ABCD_FH,9,9
key_688,march,29031990,ABCD_FH,9,9
key_689,march,29031990,ABCD_FH,9,9
key_693,march,29031990,ABCD_FH,9,9
key_694,march,29031990,ABCD_FH,9,9
key_683,march,29031990,ABCD_H + ABC_F,8,17
key_684,march,29031990,ABCD_H + ABC_F,8,17
key_685,march,29031990,ABCD_H + ABC_F,8,17
key_686,march,29031990,ABCD_H + ABC_F,8,17
key_687,march,29031990,ABCD_H + ABC_F,8,17
key_688,march,29031990,ABCD_H + ABC_F,8,17
key_689,march,29031990,ABCD_H + ABC_F,8,17
key_690,march,29031990,ABCD_H + ABC_F,8,17
key_691,march,29031990,ABCD_H + ABC_F,8,17
key_692,march,29031990,ABCD_H + ABC_F,8,17
key_693,march,29031990,ABCD_H + ABC_F,8,17
key_694,march,29031990,ABCD_H + ABC_F,8,17
key_695,march,29031990,ABCD_H + ABC_F,8,17
key_696,march,29031990,ABCD_H + ABC_F,8,17
key_697,march,29031990,ABCD_H + ABC_F,8,17
key_698,march,29031990,ABCD_H + ABC_F,8,17
key_699,march,29031990,ABCD_H + ABC_F,8,17
key_683,march,29031990,ABC_H + AB_F,2,19
key_684,march,29031990,ABC_H + AB_F,2,19
key_685,march,29031990,ABC_H + AB_F,2,19
key_686,march,29031990,ABC_H + AB_F,2,19
key_687,march,29031990,ABC_H + AB_F,2,19
key_688,march,29031990,ABC_H + AB_F,2,19
key_689,march,29031990,ABC_H + AB_F,2,19
key_690,march,29031990,ABC_H + AB_F,2,19
key_691,march,29031990,ABC_H + AB_F,2,19
key_692,march,29031990,ABC_H + AB_F,2,19
key_693,march,29031990,ABC_H + AB_F,2,19
key_694,march,29031990,ABC_H + AB_F,2,19
key_695,march,29031990,ABC_H + AB_F,2,19
key_696,march,29031990,ABC_H + AB_F,2,19
key_697,march,29031990,ABC_H + AB_F,2,19
key_698,march,29031990,ABC_H + AB_F,2,19
key_699,march,29031990,ABC_H + AB_F,2,19
key_700,march,29031990,ABC_H + AB_F,2,19
key_701,march,29031990,ABC_H + AB_F,2,19

[download]

In reply to Re: I want to remove duplicate based on specific column and value. by Veltro
in thread I want to remove duplicate based on specific column and value. by EBK

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