리눅스에서 장착된 랜카드에 실시간 대역폭을 확인하는 방법이 궁금합니다!

#!/usr/bin/perl
use strict;
use warnings;
use Sys::Statistics::Linux::NetStats;
use Data::Dumper;
 
my $lxs = Sys::Statistics::Linux::NetStats->new;
$lxs->init;
sleep 1;
my $stat = $lxs->get;
 
#원하는 것만 찍을 때
#print $stat->{eth1}{rxbyt};
 
# 모든 내용 덤프
print Dumper $stat;

$VAR1 = {
          'lo' => {
                    'txbyt' => '0.00',
                    'rxfifo' => '0.00',
                    'rxframe' => '0.00',
                    'txcompr' => '0.00',
                    'rxerrs' => '0.00',
                    'ttbyt' => '0.00',
                    'txerrs' => '0.00',
                    'rxpcks' => '0.00',
                    'txcarr' => '0.00',
                    'txdrop' => '0.00',
                    'txcolls' => '0.00',
                    'txfifo' => '0.00',
                    'rxbyt' => '0.00',
                    'txpcks' => '0.00',
                    'rxdrop' => '0.00',
                    'rxmulti' => '0.00',
                    'ttpcks' => '0.00',
                    'rxcompr' => '0.00'
                  },
          'eth1' => {
                      'txbyt' => '0.00',
                      'rxfifo' => '0.00',
                      'rxframe' => '0.00',
                      'txcompr' => '0.00',
                      'rxerrs' => '0.00',
                      'ttbyt' => '60.00',
                      'txerrs' => '0.00',
                      'rxpcks' => '1.00',
                      'txcarr' => '0.00',
                      'txdrop' => '0.00',
                      'txcolls' => '0.00',
                      'txfifo' => '0.00',
                      'rxbyt' => '60.00',
                      'txpcks' => '0.00',
                      'rxdrop' => '0.00',
                      'rxmulti' => '0.00',
                      'ttpcks' => '1.00',
                      'rxcompr' => '0.00'
                    }
        };