#!/usr/bin/perl

# https://perlmonks.org/?node_id=1222210

use strict;
use warnings;

my $devstats;

readfile("/sys/class/net/dsl/statistics/rx_bytes");
readfile("/sys/class/net/dsl/mtu");
readfile("/sys/class/net/tybalt/mtu");
readfile("/sys/class/net/tybalt/statistics/rx_bytes");
readfile("/sys/class/net/dsl/queues/tx-0/byte_queue_limits/inflight");

use Data::Dumper; print Dumper $devstats;

exit(0);

sub readfile {
  my $file = shift;

  my @data = split("/", $file);
  my $nic = $data[4];

  open(FIFO, "< $file") or die "$! opening $file";
  my $value = <FIFO>;
  if (defined($value)) {
    chomp($value);
    my $hashref = \$devstats->{$nic};
    $hashref = \$$hashref->{$_} for @data[5 .. $#data];
    $$hashref = $value;
  }
  close(FIFO);
}

##</code><code>##

$VAR1 = {
          'tybalt' => {
                        'statistics' => {
                                          'rx_bytes' => '26296'
                                        },
                        'mtu' => '1500'
                      },
          'dsl' => {
                     'mtu' => '1500',
                     'queues' => {
                                   'tx-0' => {
                                               'byte_queue_limits' => {
                                                                        'inflight' => '0'
                                                                      }
                                             }
                                 },
                     'statistics' => {
                                       'rx_bytes' => '51353977825'
                                     }
                   }
        };