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#!/usr/bin/env perl
# network usage for trend
use strict;
use warnings;
use Time::HiRes "usleep";
# be sure to flush right away!
$| = 1;
# arguments
my $oldIn = 0;
my $oldOut = 0;
my $ms = ($ARGV[0]? $ARGV[0]: 0.1) * 1000000;
my $if = ($ARGV[1]? $ARGV[1]: "eth0");
# main loop
while()
{
open FD, "/proc/net/dev" or die;
while(<FD>)
{
my ($ent, $in, $out) = /^\s*([^\s:]+):\s*(\d+)\s+\d+\s+\d+\s+\d+\s+\d+\s+\d+\s+\d+\s+\d+\s+(\d+)/;
if($ent and $ent eq $if)
{
$oldIn = $in if($oldIn == 0);
$oldOut = $out if($oldOut == 0);
print(($in - $oldIn) . " " .
($out - $oldOut) . "\n");
$oldIn = $in;
$oldOut = $out;
last;
}
}
close FD;
usleep $ms;
}
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