Shrimp Scampi Linguine

salt 3/4 lb dried linguine 12 tablespoons butter , cubed 2 tablespoons extra virgin olive oil 1/2 teaspoon crushed red pepper flakes 12 garlic cloves , finely[...]

1 lb shell on jumbo shrimp (shells reserved) 1 medium yellow onion , finely chopped 4 garlic cloves , crushed 1/2 cup butter (not margarine) 1 teaspoon dried[...]