デバイスをUSB上のプリンタ(ulpt0)に変更し、gsを使ったフィルターを設定。

--------------------/etc/printcap-----------------------
#	@(#)printcap	5.3 (Berkeley) 6/30/90
# $Id: printcap,v 1.9 1998/02/04 12:09:06 ache Exp $

#
# This enables a simple local "raw" printer, hooked up to the first
# parallel port.  No kind of filtering is done, so everything you
# pass to the "lpr" command will be printed unmodified.
#
# Remember, for further print queues you're going to add, you have to
# chose different spool directories (the "sd" capability below),
# otherwise you will greatly confuse lpd.
#
# For some advanced printing, have a look at the "apsfilter" package.
# It plugs into the lpd system, allowing you to print a variety of
# different file types by converting everything to PostScript(tm)
# format.  If you don't have a PostScript(tm) printer, don't panic,
# but do also install the "ghostscript" package.
#
# Do also refer to section 7 (Printing) of the handbook.  A local copy
# can be found under /usr/share/doc/handbook/handbook.{html,latin1}.
#
# Banner pages are now suppressed by default.  Remove the :sh:
# capability to turn them back on.
#
lp|local line printer:\
	:sh:of=/usr/local/libexec/ps2p.sh:\
	:ct#0:mx#0:lp=/dev/ulpt0:sd=/var/spool/output/lpd:lf=/var/log/lpd-errs:

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printcapで指定したフィルターの実体。
植草のプリンタはBJC-35Vだが、デバイスの設定はBJC-600用でちゃんと動いている。

----------------/usr/local/libexec/ps2p.sh----------------
#!/bin/sh
/usr/local/bin/gs -q -dSAFER -dNOPAUSE -sDEVICE=bjc600 \
 -sOutputFile=- - /usr/local/share/ghostscript/5.50/quit.ps

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