You might have issues using wc -l on Windows, unless you have installed it from somewhere like GNU. However it is easy to implement your own in Perl. Based on BrowserUk's ideas: use strict;
use warnings;
my $t=time;
# $n = `attrib /s c:\\* | wc -l`;
open (my $pipe, '-|', 'attrib /s c:\\*') or die "attrib: $!";
my $n = 0;
while (<$pipe>) { $n++ }
close $pipe;
printf "$n : %.f\n", time()-$t;
Gives: 380366 : 135 on a used space of 297GB.
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