Hi all, This is my first time dealing with CSV's in perl and I'm having some trouble. I have 2 CSV files which have the same columns. The issue I'm trying to tackle is that the first CSV file has data in a certain column that is blank in the second file. The first column is a list of filenames, and the 12th column in the file is an ID number for the corresponding file. So far, I'm taking in the first CSV file and making a hash of filenames / ID numbers. My thought was simply to read in the second file, run a match again the filenames in column 1, and then reference the hash I've created to get the ID number for that file name. Then I would write that ID number into column 12 on the second file within the same row as the filename I'm referencing. I just cant seem to work the logic to reference and then write the data. Any ideas? Thanks in advance. What I have so far for code follows: 
#!/usr/bin/perl

use Text::CSV;

$file = 'testfile.csv';

my $csv = Text::CSV->new();

#Bring in our csv, parse it, and make a hash of filenames (keys) and I
+D numbers (values)
open (CSV, "<", $file) or die $!;
my @content;
%masterlist;
while (<CSV>){
    next if ($. == 1);
    if ($csv->parse($_)){
        my @columns = $csv->fields();
        
        $masterlist{"$columns[0]"} = "$columns[11]";
        
    }else{
        my $err = $csv->error_input;
        print "Failed to parse line: $err";
    }
}
close CSV;



# Invert the array twice to get rid of any duplicates that may have go
+tten into our hash
%masterlist = reverse %masterlist; 
%masterlist = reverse %masterlist;

#Show us the output to make sure the keys and values are lined up corr
+ectly
foreach $key ( keys %masterlist ) {
    print $key, " => ", $masterlist{$key}, "\n";
}

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In reply to Please help with CSV by bones07

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