Learning Perl Objects References and Modules-Learning Perl Objects References and Modules

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undef (value)
    autovivification and
    filesystem capture example
    ref operator and
    variables with value of
    weak references and
unimport method (Exporter)
UNIVERSAL class
    inheritance and
    purpose of
    utility methods 2nd
unshift function 2nd
URI::URL module
URIs (universal resource identifiers)
url subroutine (URI::URL)
use base
use CGI
use lib 2nd 3rd
use operation 2nd 3rd 4th
use strict 2nd