my %newhash;
@newhash{@array} = @oldhash{@array};

##</code><code>##

my %new = map { $_=> $old{$_} } grep { defined $old{$_} } @array;

##</code><code>##

perl -e 'print "How sweet does a rose smell? "; chomp ($n = <STDIN>); $rose = "smells sweet to degree $n"; *other_name = *rose; print "$other_name\n"'