i'm not sure i agree that you are sorting by domain. domains are grouped, but the overall order of the result is strange. however, i think the following sub does what most people would expect:
sub sort_domains
{
map { ${$_->[0]} }
sort {
my ($pa, $pb, $rv) = ($#{$a->[1]}, $#{$b->[1]}, 0);
do { $rv ||= $a->[1][$pa] cmp $b->[1][$pb] }
while (!$rv and $pa-- and $pb--);
$rv ||= ($pb >= 0) ? -1 : ($pa >= 0) ? 1 : 0;
}
map { [ \$_, [ split /\./, $_ ] ] } @_
}
you can use it like so:
my $noodle = join $/, map { sprintf "%64s", $_ } sort_domains keys %hosts;
p.s. let the golf begin
p.p.s. why $noodle?
update: fixed logic bug in line that deals with extra domain parts ($rv ||= ($pb >= 0) ? -1…)
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