Hi Perl Monks, I need help to get the total number of my customer data. Here's the current script I am using:

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

my $cust_file = "customer.txt";
my $billing_file = "20100301.bill";
my $lastmonth_period = "1Feb2010 - 28Feb2010";

my $cust;
open (CUST_DATA, $cust_file) || die "Can't read '$cust_file': $!\n";
while (defined (my $line = <CUST_DATA>)) {

    chomp $line; # Remove trailing newline

    my ($cust_id,$cust_name) = split(/:/,$line);

    $cust->{$cust_id}->{name} = $cust_name;

}
close(CUST_DATA);

my @bill_fields = qw(cust_id x_cust_id2 Device_Code Port Traf_Dir x_st
+art_date x_end_date x_number Data_Usage);

my $bill_line;
my $bill_data;
open(BILL_DATA, $billing_file) || die "Can't read '$billing_file': $!\
+n";
while (defined (my $line = <BILL_DATA>)) {

    chomp $line; # Remove trailing newline

    @{$bill_line}{@bill_fields} = split(/\s/, $line);

    $bill_data->{ $bill_line->{cust_id} }->{ $bill_line->{Device_Code}
+ }->{ $bill_line->{Port} }->{ $bill_line->{Traf_Dir} } = $bill_line->
+{Data_Usage};

}
close(BILL_DATA);

sub by_name ($$) { return $cust->{$a}->{name} <=> $cust->{$b}->{name} 
+};

for my $customer ( keys %$cust ) {

    # Write to a file named with the customer name
    my $output = "./$cust->{$customer}->{name}.txt";
    open (CUST_OUT, ">$output") || die "Can't write to '$output': $!\n
+";
    
    print CUST_OUT "Data Transfer Report for $cust->{$customer}->{name
+}\n" .
        "Period                         Device_Code      Port        T
+raf_Dir Data_Usage\n";

    for my $device ( sort by_name keys %{$bill_data->{$customer}} ) {
    
        for my $port ( sort keys %{$bill_data->{$customer}->{$device}}
+ ) {

            (my $short_port = $port) =~ s/^FastEthernet/Fa/g;
      
            for my $direction qw(OUT IN) {
                print CUST_OUT "$lastmonth_period $device $short_port 
+$direction"  .
                    $bill_data ->{$customer}->{$device}->{$port}->{$di
+rection} . $/;

     } 
         
      }       

    }

    close(CUST_OUT);

}
[download]

Current output:

Data Transfer Report for ABC Period Device_Code Port Traf_Dir Data_Usage
1Feb2010 - 28Feb2010 SWITCH Fa1_0_1 OUT129.641
1Feb2010 - 28Feb2010 SWITCH Fa1_0_1 IN50.947
1Feb2010 - 28Feb2010 SWITCH Fa1_0_2 OUT19.723
1Feb2010 - 28Feb2010 SWITCH Fa1_0_2 IN11.478

I need to compute the total Data Usage such as:

Data Transfer Report for ABC Period Device_Code Port Traf_Dir Data_Usage
1Feb2010 - 28Feb2010 SWITCH Fa1_0_1 OUT129.641
1Feb2010 - 28Feb2010 SWITCH Fa1_0_1 IN50.947
1Feb2010 - 28Feb2010 SWITCH Fa1_0_2 OUT19.723
1Feb2010 - 28Feb2010 SWITCH Fa1_0_2 IN11.478

Total Data_Usage: 211.789 ( Need help to get this value... )

Thanks in advance for your help.