sometimes you need to see how much data your computer gets through a certain device(at least I do). I've put together this script that does just that 

use strict;
use warnings;

sub get_measures {
my $data = `/sbin/ifconfig | grep “RX bytes” | head -1`;
$data =~ /RX bytes\:(\d+) .*TX bytes\:(\d+) .*/;
my $recv = $1/1024;
my $sent=$2/1024;
$recv =~ s/\..*//;
$sent =~ s/\..*//;
#printf “received:%s KB transmitted:%s KB”,$recv,$sent;$_=”";
return ($recv,$sent);
}

my @m1 = get_measures;
sleep 1;
my @m2 = get_measures;

my @rates = ($m2[0] - $m1[0], $m2[1]-$m1[1]);
foreach (’ received’ , ‘ transmit’) {
printf “$_ rate:%sKB”,shift @rates;
}
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edit:

a slightly modified version,for making a live display of the transfered data chart using as points the transfer rates,and on the other axis time.

In reply to measuring IN/OUT traffic on your computer by spx2

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