(Assume i don't know if there is any :) )
Why there's no function to sort hashes by values (sort() can do on keys). Below is my attempt to implement sort by values :
This function will populate @sorted with sorted keys, so we can list out sorted values using the keys 
%unsorted_hash = (k1=> 'v2', k2=> 'v1');

sortvalues(\@sorted, \%unsorted_hash);

foreach (@sorted,)
{
   print "$unsorted_hash{$_}\n";
}

#----------------------------------
# sorting hashes based on values
# in : array of sorted keys (output), hashes to use
# out : none
#----------------------------------
sub sortvalues($$)
{
    my ($sorted, $hashes) = @_;

    sub swap($$) {
       my ($a, $b) = @_;
       my $temp = $$a;
       $$a = $$b;
       $$b = $temp;
    }

    for my $loop (0..(scalar @$sorted - 1)) {

        my $ub = scalar @$sorted - $loop - 2;

        for my $i (0..$ub) {

           if (($$hashes{$$sorted[$i]} <=> $$hashes{$$sorted[$i+1]}) >
+ 0 ) {
            swap (\$$sorted[$i], \$$sorted[$i+1]);
        }
        }

    }
}

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In reply to Want to sort hashes by values, anyone? by Doraemon

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