Well, you can't sort a hash, as hashes are always unsorted. But presuming that you want to process the hash values in sorted order, you can do something like this:

foreach (sort ipsort keys %ip) {
  # each sorted key will be in $_
}

sub ipsort {
  my @a = split /\./, $a;
  my @b = split /\./, $b;

  return $a[0] <=> $b[0]
      || $a[1] <=> $b[1]
      || $a[2] <=> $b[2]
      || $a[3] <=> $b[3];
}

[download]

Update: As hakkr points out below you can certainly have a variable that looks and acts like a sorted hash by using Tie::IxHash. But being pedantic, it isn't actually a hash. It's a Perl object (actually a reference to an array) that you can interact with via an interface that looks very much like a hash :)

And, anyway, it sorts by insertion order, which isn't what the OP wanted.

--
<http://www.dave.org.uk>

"The first rule of Perl club is you do not talk about Perl club."
-- Chip Salzenberg

In reply to Re: Sorting a hash of IP addresses? by davorg
in thread Sorting a hash of IP addresses? by mnperez

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