Autostart .command file with sudo command?

[wressus]

So I've finally managed to set up my siriproxy, I would like to ad a startup for siriproxy. Ive made a .command files include this:

#!/bin/bash
cd /Users/andwox/siriproxy 
rvmsudo ruby start.rb

It works, but the thing is i need to enter my password, is there anyway to not needing to write my password? Or else the autostart fails...