What did you try to run? There are a lot of reasons that you might not get any output, including waiting for user input, or crossed wires between file descriptors.

I would first try:

perl -demo
[download]

and see what you get. If that works, then your script is probably to blame. If it doesn't work, it may be some wonky interaction between the debugger, ssh, and iterm2. The debugger does some magic with STDERR, for instance, that makes it awkward when a script uses it for something too.