I used strict and warnings but it doesn't go into any other directories other than current. Thus recursion doesn't work correctly i guess. Could you pls help me tofix it now?

#!/usr/bin/perl

#
#Author: Yury Sibirski
#Name: users_home_dir
#Date: 16 December 2014
#Purpose: This program analyze the directory structure of a Linux disk
+ and identify any files larger than 500 kbytes
#
use strict;
use warnings;
my $path = shift || '.';

read_dir($path);

sub read_dir
{
        my $dir = shift;
        opendir (my $DH, $dir) or die "Couldn't open current directory
+: $!";
        while (my $file = readdir($DH))
        {#print "$file\n";
                if ($file eq "." or $file eq "..")
                {
                        next;
                }
                elsif (-z $file)
                {
                        next;
                }
                elsif (-r $file and -f $file)
                {
                        my $size = -s $file;
                        print $file," ",$size, "\n" if $size > 200;
                }

                elsif (-d $file)
                {
                        read_dir($file);
                }
        }
closedir $DH;
}
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