Semi-tested :)

#!/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);
}
[download]

Outputs (on my system):

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

---

---

Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!

Titles consisting of a single word are discouraged, and in most cases are disallowed outright.

Read Where should I post X? if you're not absolutely sure you're posting in the right place.

Please read these before you post! —

• How do I compose an effective node title?
• How do I post a question effectively?
• Markup in the Monastery

Posts may use any of the Perl Monks Approved HTML tags:

a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr

You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)

	For:		Use:
	&		&
	<		&lt;
	>		&gt;
	[		&#91;
	]		&#93;

Link using PerlMonks shortcuts! What shortcuts can I use for linking?

See Writeup Formatting Tips and other pages linked from there for more info.