I don't know why you need a HoH to get the next volume 

tapeutil -f /dev/smc0 inventory |
    perl -nle'
        BEGIN { $slot = shift(@ARGV); }
        if (/^Slot address (\d+)$/) {
            $ok = $slot == $1;
        }
        elsif ($ok && /^ *Volume Tag[ .]+(.*)/) {
            print ++($vol=$1);
            last;
        }
    ' 1123

[download]

Update: I suppose you want the next volume for a specific slot. Fixed.

In reply to Re: loading a hash of hashes from UNIX command output by ikegami
in thread loading a hash of hashes from UNIX command output by novy

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