IMO, your script would be more useful if it included some input validation. After the line:
I would suggest adding:
die "Input must be 16 characters\n"
unless 16 == length $wwn;
die "Invalid hex digit '$1'\n"
if $wwn =~ /([^[:xdigit:]])/;
Update: changed allowed input length from 10 (where did I get that number from?) to 16, as per WWN spec.
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