local @a = (1 .. 9);  # How can I use my here 
{ 
   for my $e (local @a) { 
          $e += 1; 
   } 
} 

Your inner local @a there creates a new @a with an empty list. Add a print $e inside to see that.

See the other answers in this thread for more correct answers.

-- Randal L. Schwartz, Perl hacker