Post compile file copy script

I got this working by doing this:

set rbf_file_name ".rbf"
post_message "### Copying output $rbf_file_name"
file copy -force $rbf_file_name new_dir/$rbf_file_name

This is what the Altera site says about the arguments passed in:

--- Quote Start ---

The first argument passed in the quartus(args) variable is the name of the flow or module being executed, depending on the assignment you use. The second argument is the name of the project, and the third argument is the name of the revision

--- Quote End ---

I am not sure how the output file name relates to these, but the script above seems to work fine.