This might be a moot point now but here a possible solution... 
#!/usr/bin/perl

use strict;

my $file_1 = <<FILE_1;
Alan,Bloggs,06/11/2009,11/30/2011
David,Smith,06/08/2009,09/30/2012
Rosario,Anotherone,06/05/2009,11/30/2011
Angela,Madeupname,06/11/2009,07/31/2010
Ugochukwu,Smith,06/01/2009,10/31/2012
Amarjit,Patel,08/19/2008,11/30/2011
Missing,Man,08/12/2007,12/01/2013
Julie,Schmidt,05/01/2009,09/30/2012
Waseem,Alder,06/11/2009,11/30/2011
FILE_1

my %file_1;
open( my $fh, "<", \$file_1 ) or die "Could not open file_1\n";
while (<$fh>) {
    chomp;
    my @cols = split ",";
    $file_1{"$cols[0] $cols[1]"} = $_;
}
close( $fh );

while (<DATA>) {
    chomp;
    my @cols = split ",";
    my $temp_name = "$cols[1] $cols[2]";
    if (grep /$temp_name/, (keys %file_1)) {
        my $result = "$cols[0]," .
          join ",", $file_1{$temp_name};
        print "$result\n";
    }
}

__DATA__
abc,Alan,Bloggs,06/11/2009,11/30/2011,morefields,...
cde,David,Smith,06/08/2009,09/30/2012,morefields,...
abc,Rosario,Anotherone,06/05/2009,11/30/2011,morefields,...
acd,Angela,Madeupname,06/11/2009,07/31/2010,morefields,...
cde,Ugochukwu,Smith,06/01/2009,10/31/2012,morefields,...
tla,Julie,Schmidt,05/01/2009,09/30/2012,morefields,...
tl,Waseem,Alder,06/11/2009,11/30/2011,morefields,...

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In reply to Re: nested loops to compare 2 files is only looping a limited number of times. by bichonfrise74
in thread nested loops to compare 2 files is only looping a limited number of times. by stevemayes

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