sovixi,
The key thing to realize here is that a hash doesn't have any notion of order. The most straightforward solution is to copy the information you want from the hash into a list, which is ordered, then sort the list. For example:
# Convert HoH into a list of arrayrefs: [value, key1, key2, ...]
my @list;
while (my($k1,$v1) = each(%HoH))
{
while (my($k2,$v2) = each(%$v1))
{
push @list, [$v2, $k1, $k2];
}
}
# Sort the list by its first element
@list = sort { $a->[0] <=> $b->[0] } @list;
# Now print the list
foreach my $elt (@list)
{
print "@$elt\n";
}