Hello ozboomer,

1. The code allows me to see the sites used within each "dsk" item... but I also want to see the "dsk" items used at each site. Can I do that with a single hash... or (as I expect) I'll need to maintain at least a couple of hashes?

Yes, unless you change to a different approach (e.g. a database), you’ll need another hash for this. But building it is easy: just add another line to your second foreach loop:

...
my %site_2_dsk;

foreach my $key ( sort keys %data_hash ) {
    my ($site, $dsk) = split /:/, $key;
    push @{ $output_hash{$dsk} }, $site;
    push @{ $site_2_dsk{$site} }, $dsk;
}
...
[download]

BTW, note the use of my above. Why aren’t you useing strict (and warnings)??

Hope that helps,