Hi Perlmonks,

I am trying to get rid of the last column in the output file. Though, I was successful in getting rid of the column, the columnheader still is present. I tried different things, but, I wasn't able to get the desired output. I am using three input files. The output file will contain the matching entries from the first column of the input files. The header for output file is the same as the input files except the last column. All the input files have 6 columns (so, my output file should have only 5 columns).

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

open (my $FILE1, '<', "fileX.csv") or die "cannot open file1 $!\n";
open (my $FILE2, '<', "fileY.csv") or die "cannot open file2 $!\n";
open (my $FILE3, '<', "fileZ.csv") or die "cannot open file3 $!\n";

open (my $FILE4, '>', "Outputfile.csv") or die "cannot open file4 $!\n
+";

my $csv = Text::CSV_XS->new ({ binary => 1, eol => $/ , 
                               sep_char => "\t", always_quote =>1});
print $FILE4 "".<$FILE1>;
<$FILE2>; 
<$FILE3>;


my %file2;


while (my $row = $csv->getline($FILE2)) 
{
     my @fields = @$row;
    my $id = $fields[0];
    $file2{$id}=["",@fields];
  }
my %file3;
while (my $row = $csv->getline($FILE3)) 
{
  
    my @fields = @$row;
    my $id = $fields[0];
    $file3{$id}=["",@fields];
  }

while (my $row=$csv->getline($FILE1))
{
   
    my @fields=@$row;
    @fields=@fields[map{$_}(0..4)];
    my $id=$fields[0];
   
   if (exists $file2{$id})
    {
    if(exists $file3{$id})
    {
     my $fields_ref=\@fields;
           
    $csv->print ($FILE4,$fields_ref);
       
    }
    else
    {
    }
    }
    else
    {
    }
}
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