For networked Postscript printers, you can use Terminal to send the PS file directly to the printer.
If the printer being used is the only printer installed on the Mac or the default, then you can use:
lp
filename.ps
Note that you should change directories to the location where the file resides. Otherwise you will need to enter the full path to the filename.
If there is more than one printer residing on the Mac, then you can use:
lp -d printer_name
filename.ps
For more information about printing from Command Line, refer to the Online CUPS documentation.
http://localhost:631/help/options.html?TOPIC=Getting+Started&QUERY=#BASICS
Pahu