A quick rewrite: 

use strict;
use IO::File;

my $size;
my $inode;
my $sum = 0;
my @entries;
my $e;
my $percent = 0;
my $remsum = 0;
my $counter = 0;

my $du = new IO::File;

if (@ARGV) {
    chdir "$ARGV[0]" or die "cannot change to [ $ARGV[0] ]\n";
}

$du->open("du -sk *|") or
    die "cannot open du program and pipe";

while (<$du>) {
    ($size, $inode)=split;
    $inode .= "/" if (-d $inode);
    $sum += $size;
    push @entries, { size => $size, inode => $inode };
}

@entries = sort { $b->{size} <=> $a->{size} } @entries;

$du->close;

foreach $e (@entries) {
    $percent = $e->{size}/$sum*100;

    if ($counter < 10) {
        printf(
            "%30s | %5d | %5.2f%%\n",
            $e->{inode},
            $e->{size}, 
            $percent);
    }
    else {
        $remsum += $e->{size};
    }
    $counter++;
}

if ($remsum > 0) {
    printf(
        "%30s | %5d | %5.2f%%\n",
        "REMAINING FILES",
        $remsum,
        $remsum/$sum*100);
}

[download]
Edits: * moved sort out of loop

In reply to Re: What's eating all your disk space? by csh
in thread What's eating all your disk space? by hawson

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