use strict;
use warnings;
use Net::FTP;
use File::Listing qw(parse_dir);
my $ftp = Net::FTP->new('some.host');
$ftp->login('user', 'password');
my $ls = $ftp->dir('/etc');
foreach my $entry (parse_dir($ls)) {
    my ($name, $type, $size, $mtime, $mode) = @$entry;
    if ($type eq 'd') {
        print "The directory is $name\n";
    }
    else {
        next unless ($type eq 'f' and $size > 0);
        print "$name has size $size\n";
    }
}
$ftp->quit;