Date: Sun, 24 Aug 1997 17:03:03 -0400 (EDT) From: chris@stonos.washington.dc.us To: Sean Kelly <kelly@fsl.noaa.gov> Cc: hackers@freebsd.org, bugs@freebsd.org Subject: FreeBSD docs on printers -- correction (minor) Message-ID: <199708242103.RAA00920@thanatos.stonos.washington.dc.us>
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Just picked up FreeBSD-2.2.2-RELEASE and was going through your lpr
setup docs dated 30 September 1995. Found one buglet in a filter code
example near the bottom:
Here is an example: the following script is a text filter for Hewlett
Packard DeskJet 500 printers. For other printers, substitute the
-sDEVICE argument to the gs (Ghostscript) command. (Type gs -h to get
a list of devices the current installation of Ghostscript supports.)
#!/bin/sh
#
# ifhp - Print Ghostscript-simulated PostScript on a DeskJet 500
# Installed in /usr/local/libexec/hpif
#
# Treat LF as CR+LF:
#
printf "\033&k2G" || exit 2
#
# Read first two characters of the file
#
read first_line
first_two_chars=`expr "$first_line" : '\(..\)'`
if [ "$first_two_chars" = "%!" ]; then
#
# It is PostScript; use Ghostscript to scan-convert and print it
#
/usr/local/bin/gs -dSAFER -dNOPAUSE -q -sDEVICE=djet500 -sOutputFile=- - \
&& exit 0
else
#
# Plain text or HP/PCL, so just print it directly; print a form
# at the end to eject the last page.
#
echo $first_line && cat && printf "\f" && exit 2
fi
============================================================^
exit 2
Finally, you need to notify LPD of the filter via the if capability:
:if=/usr/local/libexec/hpif:
That "exit 2" should be an "exit 0" for successful completion of plain
text output.
Thanks for the docs. Very helpful and much cleaner than the way I used
to do it.
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