c:\@Work\Perl\monks>perl -wMstrict -MData::Dump -le
"my @ra = qw(1.2.1  1.2.2  1.2.3  1.2.10  1.2.11  1.2.20  1.2.21);
 my @sorted = sort @ra;
 dd \@sorted;
"
["1.2.1", "1.2.10", "1.2.11", "1.2.2", "1.2.20", "1.2.21", "1.2.3"]