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my %hash;
while (my ($filename, $number) = &get_both) {
...
}

my @sorted_files = sort { $hash{$a} <=> $hash{$b} } keys %hash;

my @array;
while (my ($filename, $number) = &get_both) {
...
}

my @sorted = sort { $a->[1] <=> $b->[1] } @array;