Just to comment on your immediate needs -- after you type (or paste) in your sample program, enter Control-d and then press enter. By pressing Control-d, you are essentially letting the shell know you have entered all the data you wish for the perl interpreter, allowing the interpreter to now run your code.

L-LL-L--L-LL-L--L-LL-L--
-R--R-RR-R--R-RR-R--R-RR
B--B--B--B--B--B--B--B--
H---H---H---H---H---H---
(the triplet paradiddle with high-hat)