my @lines this is array of the file being read in)

my @sorted = map {$_->[0]} sort {$a->[1] <=> $b->[1] || 
             $a->[2] <=> $b->[2] || $a->[3] <=> $b->[3] ||
             $a->[4] <=> $b->[4]} map {
             [$_, split(/\./, (split /\s+/, $_)[1])]} @lines;
print "$_\n" for @sorted;