If thats the diagnostical thinking, Basic debugging checklist, 
$ perl -e"use Data::Dump qw/ dd /; %ENV = (hi =>undef ); dd( \%ENV );
{ HI => undef }

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In reply to Re^3: not able to make defined-or operator work in my code by Anonymous Monk
in thread RE: not able to make defined-or operator work in my code by lonewolf28

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