But there is a precedence problem
if (not defined($pname) && $pname ne '')
means
if (not (defined($pname) && ($pname ne '')))
while
if (!defined($pname) && $pname ne '')
means
if ((!defined($pname)) && ($pname ne ''))

The OP wants
if (!defined($pname) && $pname ne '')
or
if ((not defined($pname)) && $pname ne '')

In reply to Re^3: if not defined by ikegami
in thread if not defined by Trihedralguy

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