This info is compiled from Roger L. Traylor's web page. All the commands and variables you can set are described in Chapt. 17.5. The corresponding input file for the examples given below is listed in Chapt. 21.1. Just add the .control section to this file and run in interactive mode by

$ ngspice xspice_c1_print.cir

One way is to setup your printing like this:

.control

set hcopydevtype=postscript

op

run

plot vcc coll emit

hardcopy temp.ps vcc coll emit

.endc

Then print the postscript file temp.ps to a postscript printer.

You can add color traces to it if you wish:

.control

set hcopydevtype=postscript

* allow color and set background color if set to value > 0

set hcopypscolor=1

*color0 is background color

*color1 is the grid and text color

*colors 2-15 are for the vectors

set color0=rgb:f/f/f

set color1=rgb:0/0/0

op

run

hardcopy temp.ps vcc coll emit

.endc

Then print the postscript file temp.ps to a postscript printer.

You can also direct your output directly to a designated printer (not available in MS Windows):

.control

set hcopydevtype=postscript

*send output to the printer kec3112-clr

set hcopydev=kec3112-clr

hardcopy out.tmp vcc coll emit