@ARGV = glob '/export/home/date_file*';

##</code><code>##

while ( my $line = <> ) {

##</code><code>##

#!/usr/bin/perl
use warnings;
use strict;

use List::Util qw(sum);

# Grab text files from archive directory with glob function
my @files = glob '/export/home/date_file*';

my %counts = (
	AB => 0,
	AC => 0,
	AD => 0,
	AE => 0,
	FG => 0,
);

for my $file (@files) {
	open my $fh, '<', $file
	  or die "$file: $!";

	while ( my $line = <$fh> ) {
		my $var = substr $line, 41, 2;
		$counts{ $var }++ if exists $counts{ $var };
	}

	close $fh
	  or die "$file: $!";
}

my $sum = sum values %counts;

for my $type ( keys %counts ) {
	print "$type\t: $counts{$type}\n";
}

print "Total     \t: $sum\n";