I quite agree with GrandFather.

In fact, I think I would go a bit further and advise the use of more 'documentary' scalar variable names:
    chomp (my $raw_wwn = lc <STDIN>);
    ...
    my $fixed_wwn = join ':', unpack '(a2)*', $raw_wwn;
    do_something_with($fixed_wwn);

In reply to Re^3: Getting "un initialized value" error though variable is initialized. Please help. by AnomalousMonk
in thread Getting "un initialized value" error though variable is initialized. Please help. by perl514

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