A hash is inherently unsorted. You can sort a list of keys and store them in an array, though: 
my @keys = sort keys %hash; # adapt to your needs here.

for (@keys) {
  print "$_ => $hash{$_}\n";
}

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edit: %hash{$_} -> $hash{$_}

edit2: This seems to me reasonably efficient: 

my @keys = map { tr/a-zA-Z/A-Za-z/; $_ } sort map { tr/a-zA-Z/A-Za-z/;
+ $_ } keys %hash;

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"What should it profit a man, if he should win a flame war, yet lose his cool?"

In reply to Re: Sorting - lower to upper by Joost
in thread Sorting - lower to upper by joule

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