#!/usr/bin/perl -w

use strict;

use Text::CSV_XS qw( );

my $qfn_in = 'data.txt';

open(my $fh_in, '<', $qfn_in)
    or die("Can't open file \"$qfn_in\": $!\n");

my $fh_out = \*STDOUT;

my $csv_in  = Text::CSV_XS->new({ sep_char => ',',  eol => $/ });
my $csv_out = Text::CSV_XS->new({ sep_char => "\t", eol => $/ });

my $number = 10;

while ( my $row = $csv_in->getline($fh_in) ) {
    $csv_out->print($fh_out, [
        "Olah:",
        $number++,
        @$row[2,5,3,0,4],
    ]);
}