Or did you want the volume after highest existing volume? 
tapeutil -f /dev/smc0 inventory |
    perl -le'
        my $vol = ( sort grep /^ *Volume Tag[ .]+(.*)/, <> )[-1];
        print ++$vol;
    '

[download]

Your requirements are very unclear to me.

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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