Ubuntu :: Fill In Command Line Prompts From Script?

I have set up an ssh server for myself and a friend to work on a project. It is configured to use password authentication, but I am somewhat uncomfortable giving him my password to get the files. I was wondering if there was any way to have a script that logs him on, filling in the password at the prompt. So that when "ssh xxxx@xxxxx" is run, the script fills in the prompt for the password rather than him filling it in.Of course he still could find the file within the script before it is run, but knowing his somewhat ADD nature it seems unlikely.