And as an example of the two different types of ordering (i.e., the default lexicographic-ascending of sort vs. numeric ascending), consider:

>perl -wMstrict -le
"my @unsorted = (1, 10, 100, 11, 9, 3, 5, 2);
 my @lexic_sorted = sort @unsorted;
 print qq{@lexic_sorted};
 my @numeric_sorted = sort { $a <=> $b } @unsorted;
 print qq{@numeric_sorted};
"
1 10 100 11 2 3 5 9
1 2 3 5 9 10 11 100
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