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,

Athanasius <°(((>< contra mundum Iustus alius egestas vitae, eros Piratica,

In reply to Re: How to Check Hashes for Missing Items when Keys can be Values and vice versa by Athanasius
in thread How to Check Hashes for Missing Items when Keys can be Values and vice versa by ozboomer

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