The LPRng software is an enhanced, extended, and portable implementation of the Berkeley LPR print spooler functionality. While providing the same interface and meeting RFC1179 requirements, the implementation is completely new and provides support for the following features: lightweight (no databases needed) lpr, lpc, and lprm programs; dynamic redirection of print queues; automatic job holding; highly verbose diagnostics; multiple printers serving a single queue; client programs do not need to run SUID root; greatly enhanced security checks; and a greatly improved permission and authorization mechanism.
LPRng is mature and stable and incorporates a flexible print filtering mechanism. It excels as a print server but can be used as a print client. It can also print from CUPS clients installed on other machines with minor hand configuration on the CUPS side.
- 1 Installation
- 2 Configuration
- 2.1 Control files
- 2.2 Configure printer settings (filters)
- 2.3 Printcap file
- 2.4 Start the lpd daemon
- 3 Usage
- 4 CUPS and LPRng
- 5 Troubleshooting
- Install the AUR package from the AUR.
- Install optional filter packages:
Configuration consists of the following steps:
- Set up control files
- Configure filters
- Create a printcap file and spool directories
- Enable and start the lpd daemon using systemctl
Two control files must be configured:
The default configurations in
/usr/share/doc/lprng are adequate for a client computer printing to a remote printer. Copy these to
cp /usr/share/doc/lprng /etc/lprng/lpd
and edit it.
For a server receiving requests across the Internet, uncomment the last line in
/etc/lprng/lpd/lpd.conf and configure permissions as documented in the comments of
lpd.perms.sample, located in
/usr/share/doc/lprng, document more complex situations.
Configure printer settings (filters)
It's fine if you just pick one of the following filter (settings) instructions. Just decide which way you want to go.
If you have a network Postscript printer you are in luck. The sample postscript filter
/usr/share/doc/lprng/psfilter converts PDF and text files to Postscript. Other file types are rejected.
Copy this file to
/usr/lib/lprng/lpd and rename it as desired. Then edit it to set your paper type and your choice of single-sided/double-sided printing.
If you wish to have separate single-sided and double-sided print queues, make two copies with different names and edit appropriately.
Another mechanism for print filtering is via the Foomatic system. This system used by CUPS. Install AUR as the
foomatic-rip program in the CUPS installation has been modified to remove LPRng support).
foofilter as described above, editing for your desired
.ppd file. Install the
.ppd file in conformance with the path specified in
/etc/lprng/lpd is a good location.)
To use Hewlett Packard printers, install
.ppd files for virtually all Hewlett Packard printers.
If you have a printer that has a Ghostscript driver, copy and edit
gsfilter as above to set the appropriate driver and the paper type. You can discover the drivers available in your version of Ghostscript by typing the command
$ gs -h
Note that support for various printer features is typically limited and out of date with this option.
/etc/lprng/printcap file tells LPRng about the printers you have and the print filters that need to be used.
printcap.sample file (in
/usr/share/doc/lprng) provides a short tutorial as to how to set up a printcap file. The printcap fragments
printcap_client in this directory provide additional information.
An example file may look like this for two local printers:
DCPJ4120DW:\ :mx=0:\ :sd=/var/spool/lpd/DCPJ4120DW:\ :sh:\ :lp=/dev/usb/lp1:\ :if=/opt/brother/Printers/dcpj4120dw/lpd/filterdcpj4120dw: HL2035:\ :mx=0:\ :sd=/var/spool/lpd/HL2035:\ :sh:\ :lp=/dev/usb/lp0:\ :if=/opt/brother/Printers/brhl2035/lpd/filterHL2030:
Network printing advice
Generally, one computer should be designated as the server for one or more printers. Other client computers should send their print jobs to the server rather than the printer directly.
The rather non-obvious server setup in
printcap_server is needed to make print filtering work on network printers, as opposed to printers attached directly to the server computer via, say, a USB port. (See the reference manual.)
After creating the printcap file, run the command as root
$ /usr/bin/checkpc -f
This will check your configuration and create spool directories in
checkpc complains about something, address the issue and rerun.
Start the lpd daemon
LPRng runs a daemon in background called
lpd to manage print requests. Enable and start this daemon using systemd. If these commands complete without complaint, you should be good to go.
systemctl start lpd.service systemctl enable lpd.service
If any configuration files are changed, one must restart
lpr command is the printing tool in LPRng. The general form of use is
$ lpr [options] [file_to_be_printed]
If no file is specified, input is accepted on the standard input. The most useful options are
-P printer and
-K number_of_copies. In the absence of the printer option, setting the environment variable
PRINTER to the name of the printer will tell LPRng which printer to use.
Other useful commands are
lpq (examine the print queue) and
lprm (remove a print job from the queue). See the man pages for
CUPS and LPRng
CUPS may be used to access a printer on a server from a client machine on which LPRng is not installed. The trick is to configure CUPS to access the printer via the
lpd protocol. This is easy to do using the web interface to CUPS. Also, since the server as set up here does all necessary print filtering, tell CUPS to use the
raw filter. Alternative divisions between filtering responsibilities can be devised, depending on your needs.
Gnome2/GTK2 applications (including Firefox, Mate, LXDE, and XFCE4) still support
lpr printing. To make this work, create the file
~/.gtkrc-2.0 in your home directory containing a single line
gtk-print-backends = "file,lpr"
LXDE may create its own
~/.gtkrc-2.0 file if the look and feel of the desktop are altered -- look in this file for instructions as to how to proceed.
pdftops from the package is used to create Postscript from PDF files in the print filters.
pdftops produces bad or no output.
An alternative filter,
pdf2ps from the package, can be substituted, but this filter has its own problems.
For a one-shot case, just use
pdf2ps or some other converter to produce Postscript and send that to the printer.
Double-sided printing of Postscript files is effected in the example filters by inserting a line of Postscript code right after the first line. For some Postscript files, this doesn't work.
In this case, send the Postscript file to a single-side print queue. The print filter
psfilter set up for single-sided printing does no filtering of Postscript files.