fileA
A,B,C,D

fileB
A,E,F,G,H

New File (fileC)
A,B,D,G

##</code><code>##

#!/usr/bin/perl

use strict;
use warnings;

my %scanned=();
my %import=();
my @LIST=();
open(SCAN, "scan3.txt") || die "$!\n";
while (<SCAN>) {
        my ( $machine, $luser, $hacked, $privel, undef ) =
                split(/,/,$_);
        $scanned{$machine}=[ $luser, $hacked, $privel ];
}
close (SCAN);

open(IMPORT, "importtodb.csv") || die "$!\n";
while (<IMPORT>) {
        my ( $machine, $user, undef, undef, undef, undef, $locale, undef ) =
                split(/,/,$_);
        $import{$machine}=[ $user, $locale ];
}
close (IMPORT);

foreach my $machine (keys(%scanned)) {
        if(exists($scanned{$machine})) {
                push(@LIST, $machine);
        }
}
foreach my $item(@LIST){
        print "$item\n";
}

##</code><code>##

$machine,$luser,$user,$hacked,$locale