http://www.perlmonks.org?node_id=944193


in reply to Script to convert HBA WWNs to lowercase and add ":"[Updated]

IMO, your script would be more useful if it included some input validation. After the line:

chomp ($wwn=<STDIN>);

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.