use Win32::NetAdmin;

my $path = 'c:';
my $file = 'list.txt';

open ( OUT, ">$path/$file" ) ||
    die "Cannot create machine list. :$!";

my @users;
Win32::NetAdmin::GetUsers("\\\\PDC",'',\@users);
my @computers = grep { /\$$/ } @users;
for my $box (@computers) {
   chop $box;          # removes terminal char, must be $ from grep
   print OUT "$box\n"; # print each $box on a newline
}
close OUT;