Currently, my user need the output to send\save as .pdf format!

This can be done by installing the "Acrobat pdfWriter" as default printer,
and write the following command :

repo form user_file TO PRINT NOCONSOLE

But, above method need us manually to key in the file name.

My question is what should i do if i dun wanna user to key in manually the file name for the pdf?? What command i should use to auto generate the pdf file??
Pls advice!!