20100221, abc_1, 200
20100221, abc_4, 350
20100221, opq_3, 200
20100221, abc_5, 220
20100221, xyz_1, 500
20100221, abc_2, 500
20100221, abc_3, 100
20100221, xyz_2, 700
20100221, opq_2, 350
20100221, xyz_3, 100
20100221, opq_1, 230

##</code><code>##

20100221, abc, 1370
20100221, xyz, 1300
20100221, opq, 780

##</code><code>##

use strict;
use warnings;

my $inputfilename  = $ARGV[0]; ### CSV file name. ###

open( my $in_fh, "<", $inputfilename ) or die "Can't open $inputfilename : $!";

while (my $line = <$in_fh>) {
  chomp($line);
  my @columns = split(',', $line, 2);