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my $dir = shift; 

my $sort_sub = $dir eq 'up' ? sub {$a <=> $b} : sub {$b <=> $a};
my @items = (3, 1, 4, 1, 5, 9, 2, 6, 5, 3, 5);
print "@{[sort { $sort_sub->() } @items]}\n";

$ perl sample up
1 1 2 3 3 4 5 5 5 6 9
$ perl sample down
9 6 5 5 5 4 3 3 2 1 1