Here's some recursion leveraging a sub. 

#!/usr/bin/perl

use strict;
use warnings;

my $dir = "/path_to_nas/data/";
my @directories;

find_dirs($dir);

sub find_dirs {
    my $dir = $_[0];
    for my $worker (glob("$dir*")) {
        if (-d $worker) {
            push $worker, @directories;
            find_dirs("$worker/");
        } else {
            # don't care.. standard file.
        }
    }
}

print scalar(@directories), "\n";

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In reply to Re: Get folders in a directory with 20k directories? by osbosb
in thread Get folders in a directory with 20k directories? by perlpreben

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