http://qs1969.pair.com?node_id=286666

Deda has asked for the wisdom of the Perl Monks concerning the following question:

hi, i have a hash like
%hash=( a => 1 b => 2 }
How do I 'undef' a hash entry - not the value, but the key? if i write
undef $hash{a}
i get
%hash=( a => undef b => 2 }
What i want to get is
%hash=( b => 2 }
I need this for %ENV modification (UX: unset equivalent).