Xerox WorkCentrePro - Manual (Page 66)

4 UNIX TCP/IP
66 Xerox CopyCentre/WorkCentre/WorkCentre Pro 123/128 System Administration Guide
For example, to print a file named “file1”, two-sided on A4 (210 × 297 mm/8.3 × 11.7
inches) on printer fxPS, enter the following command:
%lpr -PfxPS -C,DUP,A4 file1
NOTE: If the parameter string of the -C option exceeds 64 characters, the operation
may not function correctly.