perldoc -f unshift
       unshift ARRAY,LIST
               Does the opposite of a "shift".  Or the opposite
               of a "push", depending on how you look at it.
               Prepends list to the front of the array, and
               returns the new number of elements in the array.

                   unshift(ARGV, '-e') unless $ARGV[0] =~ /^-/;

               Note the LIST is prepended whole, not one element
               at a time, so the prepended elements stay in the
               same order.  Use "reverse" to do the reverse.