The psmerge program writes its output to the standard output channel (stdout). This can be redirected to a file or piped straight to a printer queue; e.g.:
or% psmerge picture.eps > printme.ps
% psmerge picture.eps | lpr -Pps_printer
The examples above simply converts an EPS file to a normal PostScript
file, the only difference being that the normal PostScript file shifts
the picture origin to the bottom left corner of the printable area on
the printer. This is useful because if an EPS file is printed without
conversion, the picture origin will be at the bottom left corner of the
paper and on most printers this means that the bottom and left edges
will lie outside the printable area and will be invisible.
PSMERGE Encapsulated PostScript Handling Utility