use File::Find;
use strict;

my ($dir, @parts);

open(IN, "< input.csv") or die("Couldn't open input.csv\n"); 
open(OUT, "> output.csv") or die("Couldn't open output.csv\n"); 

@parts=split (/,/,<IN>);
#Displays total size of specified path (total includes subfolders)
foreach my $dir (@parts) {
   my $total;
   print "\nWalking $dir\n";
   find(sub { $total += -s }, $dir);
   $total = ($total / 1024) / 1024;
   $total = sprintf("%0.2f", $total);
   print OUT "$dir, $total, mb, \n";
}
print "\n\tOutput created.\n";
close(OUT);

#Displays program syntax on screen
$dir = $ARGV[0];