Hi Perlmonks,

This post is bit of follow up to my previous post. I got a refined code from Marshall and it worked fine. But, now I am using the same code in another file which has several repeat IDs. I want to match this with another file which is a subset of the first file. Though, I was able to get the result, because of the repeat IDs, my output has less number of rows than the first file. How can I tweak the code below to resolve this repeat IDs. 

#!/usr/bin/perl -w
use strict;
use warnings;
use Text::CSV_XS;

open (my $FILE1, '<', "File1.csv") or die "cannot open file1 $!\n";
open (my $FILE2, '<', "File2.csv") or die "cannot open file3 $!\n";
open (my $FILE3, '>', "OutputFile.csv") or die "cannot open file3 $!\n
+";

my $csv = Text::CSV_XS->new ({ binary => 1, eol => $/ , 
                               sep_char => "\t", always_quote =>1});

print $FILE3 "Match\t".<$FILE1>; # header for file3
<$FILE2>;                        # skip header line of file2

my %file1; 
my %file2;

while (my $row = $csv->getline($FILE1)) 
{
    chomp $row;
    my @fields = @$row;
    my $id = $fields[1];
    my $newfield=["",@fields];
    if (exists($file1{$id})){
    print "repeat $id\n";
    }
    $file1{$id}=$newfield;
    
}

while (my $row = $csv->getline($FILE2)) 
{
    chomp $row;
    my @fields = @$row;
    my $id = $fields[0];
    $file2{$id}=["","",@fields,"","","","","","","","","","","","","",
+"","",""];
}

foreach my $id1 (keys %file1)
{
    if (exists $file2{$id1})
    {
        $file1{$id1}[0] ="HK";             #both files
        $csv->print ($FILE3, $file1{$id1});
    }
    else
    {
        $file1{$id1}[0] ="NOT_HK";                #file1 only
        $csv->print ($FILE3, $file1{$id1});
    }
}

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In reply to Matching two files based on one column common in each by bluray

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