#!/usr/bin/perl
use strict;
use warnings;
use Sys::Statistics::Linux;
use Sys::Statistics::Linux::DiskUsage;
$Sys::Statistics::Linux::DiskUsage::DF_CMD = 'df -hP';
my $sys  = Sys::Statistics::Linux->new(diskusage => 1);
my $stat = $sys->get;
# $stat->diskusage returns the first level keys of the
# statistic hash as a array. The first level keys are
# the disk names.
foreach my $disk ( $stat->diskusage ) { # Gimme the disk names
    print "Statistics for disk $disk:\n";
    # $stat->diskusage($disk) returns the seconds level keys of
    # the statistics. The second level keys are the statistic keys
    # for the passed disk.
    foreach my $key ( sort $stat->diskusage($disk) ) { # Gimme the statistic keys
        # $stat->diskusage($disk, $key) returns the value for the passed
        # disk and key.
        printf "   %-20s %s\n", $key, $stat->diskusage($disk, $key);
    }
}