The postprocessor grolbp accepts the following command-line
options:
-cn
Print n copies of each page.
-Fdir
Put the directory dir/devname in front of the
search path for the font, prologue and device description files,
given the target device name, usually lbp.
-l
Use landscape orientation.
-oorientation
Use the orientation specified: portrait or
landscape.
-ppapersize
Set the page dimensions. See groff_font(5) manual page for
details.
-wn
Set the line thickness to n/1000em. Overrides the
default value n = 40.