# The Linux Printing HOWTO

gtaylor+pht@picante.com

Version $Revision: 1.2$, $Date: 2000/09/19 20:36:53$

This is the Linux Printing HOWTO, a collection of information on how to generate, preview, print and fax anything under Linux (and other Unices in general).

1. Introduction
1.1. History
2. Quick Start
3. How to print
3.1. With PDQ
3.2. With LPD and the lpr command
3.3. GUI Printing Tools
4. Kernel printer devices
4.1. The lp device (kernels <=2.1.32)
4.2. The parport device (kernels >= 2.1.33)
4.3. Serial devices
4.4. USB Devices
5. Supported Printers
5.1. Postscript
5.2. Non-Postscript
5.3. What printers work?
5.4. How to buy a printer
6. Spooling software
6.1. LPD
6.2. PDQ
6.3. LPRng
6.4. PPR
6.5. CUPS
7. How it all works
7.1. PDQ
7.2. LPD
8. How to set things up
8.1. Configuring PDQ
8.2. Configuring LPD
8.3. Large Installations
8.4. Accounting
9. Vendor Solutions
9.1. Red Hat
9.2. Debian
9.3. SuSE
9.4. Caldera
9.5. Corel
9.6. Mandrake
9.7. Other Distributions
10. Ghostscript.
10.1. Invoking Ghostscript
10.2. Ghostscript output tuning
11. Networks
11.1. Printing to a Unix/lpd host
11.2. Printing to a Windows or Samba printer
11.3. Printing to a NetWare Printer
11.4. Printing to an EtherTalk (Apple) printer
11.5. Printing to a networked printer
11.6. Running an if for remote printers with old LPDs
11.7. From Windows.
11.8. From an Apple.
11.9. From Netware.
12. Windows-only printers
12.1. The Ghostscript Windows redirector
12.2. HP Winprinters
12.3. Lexmark Winprinters
13. How to print to a fax machine.
13.1. Using a faxmodem
13.2. Using the Remote Printing Service
13.3. Commercial Faxing Services
14. How to generate something worth printing.
14.1. Markup languages
14.2. WYSIWYG Word Processors
15. Printing Photographs
15.1. Ghostscript and Photos
15.2. Paper
15.3. Printer Settings
15.4. Print Durability
15.5. Shareware and Commercial Software
16. On-screen previewing of printable things.
16.1. PostScript
16.2. TeX dvi
17. Serial printers under lpd
17.1. Setting up in printcap
17.2. Older serial printers that drop characters
18. What's missing?
18.1. Plumbing
18.2. Fonts
18.4. Drivers
19. Credits
Index

# 1. Introduction

The Printing HOWTO should contain everything you need to know to help you set up printing services on your Linux box(en). As life would have it, it's a bit more complicated than in the point-and-click world of Microsoft and Apple, but it's also a bit more flexible and certainly easier to administer for large LANs.

This document is structured so that most people will only need to read the first half or so. Most of the more obscure and situation-dependent information in here is in the last half, and can be easily located in the Table of Contents, whereas most of the information through section 8 or 9 is probably needed by most people.

If you find this document or the LinuxPrinting.org website useful, consider buying something through my referral association with buy.com or outpost.com; please use the links on the suggested printers page so that your purchase can be credited to LinuxPrinting.org.

Since version 3.x is a complete rewrite, some information from previous editions has been lost. This is by design, as the previous HOWTOs were so large as to be 60 typeset pages, and had the narrative flow of a dead turtle. If you do not find your answers here, you are encouraged to a) look on the LinuxPrinting.org website and b) drop me a note saying what ought to be here but isn't.

The LinuxPrinting.org website is a good place to find the latest version; it is also, of course, distributed from Metalab (metalab.unc.edu) and your friendly local LDP mirror.

## 1.1. History

This is the fourth generation of the Printing HOWTO. The history of the PHT may be chronicled thusly:

1. I wrote the printing-howto in 1992 in response to too many printing questions in comp.os.linux, and posted it. This predated the HOWTO project by a few months and was the first FAQlet called a howto'. This edition was in plain ascii.

2. After joining the HOWTO project, the Printing-HOWTO was merged with an Lpd FAQ by Brian McCauley <B.A.McCauley@bham.ac.uk>; we continued to co-author the PHT for two years or so. At some point we incorporated the work of Karl Auer <Karl.Auer@anu.edu.au>. This generation of the PHT was in TeXinfo, and available in PS, HTML, Ascii, and Info.

3. After letting the PHT rot and decay for over a year, and an unsuccessful attempt at getting someone else to maintain it, this rewrite happened. This generation of the PHT is written in SGML using the LinuxDoc DTD and the SGML-Tools-1 package. Beginning with version 3.27, it incorporates a summary of a companion printer support database; before 3.27 there was never a printer compatibility list in this HOWTO (!).

4. In mid-January, 2000, I found out about the PDQ print "spooler". PDQ provides a printing mechanism so much better than lpd ever did that I spent several hours playing with it, rewrote parts of this HOWTO, and bumped the version number of the document to 4.

5. In mid-2000, I moved my printing website to www.linuxprinting.org, and began offering more powerful configuration tools there. I also converted the HOWTO to DocBook, and initiated coverage of CUPS, LPRng, and GPR/libppd.

This document is Copyright (c) 1992-2000 by Grant Taylor. Feel free to copy and redistribute this document according to the terms of the GNU General Public License, revision 2 or later.

# 2. Quick Start

The quickest way to get started is simply to use the setup tools provided by your vendor. Assuming that this includes support for your driver, and assuming that your vendor shipped the driver for your printer, then it should be easy to get a basic setup going this way. For information on vendor-provided setup tools, see Section 9.

If your vendor's tool doesn't work out, you should figure out if your printer is supposed to work at all. Consult the printer compatibility listings in Section 5.3.1 as well as the online version described there.

If your printer is known to work with a driver, check that you have that driver, and install if it not. Typically you will be able to find a contributed Ghostscript package including newer Ghostscript code and assorted third-party drivers. If not, you can compile it yourself; the process is not trivial, but it is well documented. See Section 10 for more information on Ghostscript.

After installing the proper driver, attempt again to configure your printer with your vendor's tools. If that fails, select a suitable third party tool from those described in Section 8. If that also fails, you'll need to construct your own setup; again see Section 8.

If you're still stuck, you've got a little troubleshooting to do. It's probably best to read most of this document first to get a feel for how things are supposed to work; then you'll be in a better position to debug.

# 3. How to print

You actually use a different command to print depending on which spooling software you use.

## 3.1. With PDQ

Most systems today ship with lpd, so this section won't apply. That said, I now recommend that people install and use PDQ in most cases instead of (or in addition to) lpd. PDQ just has much better support for printer options and such.

With PDQ, instead of the lpr command, you use the command pdq or xpdq. Both work much like the traditional lpr in that they will print the files you specify, or stdin if no files are given.

### 3.1.1. Xpdq

Xpdq is an X Windows application that shows a list of available printers and a summary of the print queue (including current and historical jobs). There are two options under the File menu, one to print specific files, and one to print stdin. You can set whatever options are defined in your printer driver from the Driver Options dialog; typically there will be duplex, resolution, paper type and size settings, and so forth.

### 3.1.2. Pdq

The PDQ system's command-line printing command is simply called pdq. It can be used in place of the lpr command in most situations; it accepts the -P printer specification argument. Like lpr, it prints either the listed file(s) or stdin.

Printer options can be controlled with the -o and -a options.

## 3.2. With LPD and the lpr command

If you've already got lpd setup to print to your printer, or your system administrator already did so, or your vendor did so for you, then all you need to do is learn how to use the lpr command. The Printing Usage HOWTO covers this, and a few other queue manipulation commands you should probably know. Or just read the lpr(1) man page.

In a nutshell, you specify the queue name with -P, and specify a filename to print a file, or nothing to print from stdin. Driver options are traditionally not controllable from lpr, but various systems accept certain options with -o, -Z, or -J.

If, however, you have a new system or new printer, then you'll have to set up printing services one way or another before you can print. Read on!

## 3.3. GUI Printing Tools

Most spooling systems alone offer only a rather basic command-line interface. Rather than use lpr directly, you may wish to obtain and use a front-end interface. These generally let you fiddle with various printing options (the printer, paper types, collation, n-up, etc) in an easy-to-use graphical way. Some may have other features, as well.

### 3.3.1. GPR

GPR, by Thomas Hubbell, uses code from CUPS to filter Postscript jobs and offer easy user control over job options. Some options (like n-way printing, page selection, etc) are implemented directly by GPR, while most others are implemented by the printer or by the spooler's filter system.

GPR works with LPD or LPRng; or can be compiled specifically for use with VA Linux's modified LPD. When compiled normally, it uses VA's libppd directly to produce printer-specific PostScript which it will then submit to the lpr command. When compiled for VA's LPD, it will submit your unmodified job PostScript to the lpr command, along with the set of job options you specify. This is arguably the better route, since it allows the Postscript to be redirected to a different printer by the spooler when appropriate; unfortunately it required VA's special LPD, which is not in wide circulation yet (although it is of course trivial to install).

To use GPR, first select a printer (by LPD queue name) and check that GPR has loaded the proper PPD file. If it hasn't, you'll need to specify the PPD filename, and specify your printer's options in the Printer Configuration dialog (you get this dialog by pressing the Printer Configuration button; it contains assorted printer setup options defined by the PPD).

Once you've configured your printer in GPR, you can print jobs by specifying the filename and selecting the proper options from the Common' and Advanced' tabbed panels. The Common' options are implemented directly by GPR for all printers, while the Advanced' options are defined by the PPD file for your printer. You can see these option panels in Figure 2 and Figure 3.

Figure 1. GPR Main Options

Figure 2. GPR Common Options

Figure 3. GPR Printer Options

### 3.3.2. XPP

If you use CUPS as your spooler, you can use the program XPP (see Figure 4).

To print with XPP, simply run the xpp program, and specify a file (or nothing, if you're using xpp in place of lpr to print from stdin). Then select a printer from the list of configured printers, and select any options you'd like to apply from the various tabbed panels. See Figure 5 for an example options panel highlighting the standard CUPS options.

You can save your selected printer and all the options with the Save Settings' button.

Figure 4. XPP Main Window

Figure 5. CUPS/XPP Options Window

### 3.3.3. XPDQ

PDQ can be easily configured to print to queues controlled by most spooling systems, and PDQ's configuration syntax offers a very easy way to define arbitrary filtering and user options for print jobs. So you can thus use xpdq as a front-end to LPD printing with great success.

# 4. Kernel printer devices

There are two completely different device drivers for the parallel port; which one you are using depends on your kernel version (which you can find out with the command uname -a). The driver changed in Linux 2.1.33; essentially all current systems will be running kernel 2.2 or later, so you'll probably want to skip ahead to the parport driver section.

A few details are the same for both styles of driver. Most notably, many people have found that Linux will not detect their parallel port unless they disable "Plug and Play" in their PC BIOS. (This is no surprise; the track record for PnP of non-PCI devices with Windows and elsewhere has been something of a disaster).

## 4.1. The lp device (kernels <=2.1.32)

The Linux kernel (<=2.1.32), assuming you have compiled in or loaded the lp device (the output of cat /proc/devices should include the device lp if it is loaded), provides one or more of /dev/lp0, /dev/lp1, and /dev/lp2. These are NOT assigned dynamically, rather, each corresponds to a specific hardware I/O address. This means that your first printer may be lp0 or lp1 depending on your hardware. Just try both.

A few users have reported that their bidirectional lp ports aren't detected if they use an older unidirectional printer cable. Check that you've got a decent cable.

One cannot run the plip and lp drivers at the same time on any given port (under 2.0, anyway). You can, however, have one or the other driver loaded at any given time either manually, or by kerneld with version 2.x (and later 1.3.x) kernels. By carefully setting the interrupts and such, you can supposedly run plip on one port and lp on the other. One person did so by editing the drivers; I eagerly await a success report of someone doing so with only a clever command line.

There is a little utility called tunelp floating about with which you, as root, can tune the Linux 2.0 lp device's interrupt usage, polling rate, and other options.

When the lp driver is built into the kernel, the kernel will accept an lp= option to set interrupts and io addresses:
 When the lp driver is built in to the kernel, you may use the LILO/LOADLIN command line to set the port addresses and interrupts that the driver will use. Syntax: lp=port0[,irq0[,port1[,irq1[,port2[,irq2]]]]] For example: lp=0x378,0 or lp=0x278,5,0x378,7 ** Note that if this feature is used, you must specify *all* the ports you want considered, there are no defaults. You can disable a built-in driver with lp=0.

When loaded as a module, it is possible to specify io addresses and interrupt lines on the insmod command line (or in /etc/conf.modules so as to affect kerneld) using the usual module argument syntax. The parameters are io=port0,port1,port2 and irq=irq0,irq1,irq2. Read ye the man page for insmod for more information on this.

**For those of you who (like me) can never find the standard port numbers when you need them, they are as in the second example above. The other port (lp0) is at 0x3bc. I've no idea what interrupt it usually uses.

The source code for the Linux 2.0 parallel port driver is in /usr/src/linux/drivers/char/lp.c.

## 4.2. The parport device (kernels >= 2.1.33)

Beginning with kernel 2.1.33 (and available as a patch for kernel 2.0.30), the lp device is merely a client of the new parport device. The addition of the parport device corrects a number of the problems that plague the old lp device driver - it can share the port with other drivers, it dynamically assigns available parallel ports to device numbers rather than enforcing a fixed correspondence between I/O addresses and port numbers, and so forth.

The advent of the parport device has enabled a whole flock of new parallel-port drivers for things like Zip drives, Backpack CD-ROMs and disks, and so forth. Some of these are also available in versions for 2.0 kernels; look around on the web.

The main difference that you will notice, so far as printing goes, is that parport-based kernels dynamically assign lp devices to parallel ports. So what was lp1 under Linux 2.0 may well be lp0 under Linux 2.2. Be sure to check this if you upgrade from an lp-driver kernel to a parport-driver kernel.

The most popular problems with this device seems to stem from misconfiguration:

The Distribution

Some Linux distributions don't ship with a properly setup /etc/modules.conf (or /etc/conf.modules), so the driver isn't loaded properly when you need it to be. With a recent modutils, the proper magical lines from modules.conf seem to be:
  alias /dev/printers lp # only for devfs? alias /dev/lp* lp # only for devfs? alias parport_lowlevel parport_pc # missing in Red Hat 6.0-6.1

The BIOS

Many PC BIOSes will make the parallel port into a Plug-and-Play device. This just adds needless complexity to a perfectly simple device that is nearly always present; turn off the PnP setting for your parallel prot ("LPT1" in many BIOSes) if your parallel port isn't detected by the Linux driver. The correct setting is often called "legacy", "ISA", or "0x378", but probably not "disabled".

You can also read the parport documentation in your kernel sources, or look at the parport web site.

## 4.3. Serial devices

Serial devices are usually called something like /dev/ttyS1 under Linux. The utility stty will allow you to interactively view or set the settings for a serial port; setserial will allow you to control a few extended attributes and configure IRQs and I/O addresses for non-standard ports. Further discussion of serial ports under Linux may be found in the Serial-HOWTO.

When using a slow serial printer with flow control, you may find that some of your print jobs get truncated. This may be due to the serial port, whose default behavior is to purge any untransmitted characters from its buffer 30 seconds after the port device is closed. The buffer can hold up to 4096 characters, and if your printer uses flow control and is slow enough that it can't accept all the data from the buffer within 30 seconds after printing software has closed the serial port, the tail end of the buffer's contents will be lost. If the command cat file > /dev/ttyS2 produces complete printouts for short files but truncated ones for longer files, you may have this condition.

The 30 second interval can be adjusted through the "closing_wait" commandline option of setserial (version 2.12 and later). A machine's serial ports are usually initialized by a call to setserial in the rc.serial boot file. The call for the printing serial port can be modified to set the closing_wait at the same time as it sets that port's other parameters.

## 4.4. USB Devices

I don't have any USB devices to play with, so all I can offer are pointers. Once set up, you end up with the device file /dev/usb/lp0, much as you do with parallel ports, which will work fine in printcap or as a PDQ local-port device.

USB is documented at the Linux USB Website.

# 5. Supported Printers

The Linux kernel will let you speak with any printer that you can plug into a serial, parallel, or usb port, plus any printer on the network, but this alone is insufficient; you must also be able to generate data that the printer will understand. Primary among the incompatible printers are those referred to as "Windows" or "GDI" printers. They are called this because all or part of the printer control language and the design details of the printing mechanism are not documented. Typically the vendor will provide a Windows driver and happily sell only to Windows users; this is why they are called Winprinters. In some cases the vendor also provides drivers for NT, OS/2, or other operating systems.

Many of these printers do not work with Linux. A few of them do, and some of them only work a little bit (usually because someone has reverse engineered the details needed to write a driver). See the printer support list below for details on specific printers.

A few printers are in-between. Some of NEC's models, for example, implement a simple form of the standard printer language PCL that allows PCL-speaking software to print at up to 300dpi, but only NEC knows how to get the full 600dpi out of these printers.

Note that if you already have one of these Winprinters, there are roundabout ways to get Linux to print to one, but they're rather awkward. See Section 12 in this document for more discussion of Windows-only printers.

## 5.1. Postscript

As for what printers do work with Linux, the best choice is to buy a printer with native PostScript support in firmware. Nearly all Unix software that produces printable output produces it in PostScript, so obviously it'd be nice to get a printer that supports PostScript directly. Unfortunately, PostScript support is scarce outside the laser printer domain, and is sometimes a costly add-on.

Unix software, and the publishing industry in general, have standardized upon Postscript as the printer control language of choice. This happened for several reasons:

Timing

Postscript arrived as part of the Apple Laserwriter, a perfect companion to the Macintosh, the system largely responsible for the desktop publishing revolution of the 80s.

It's device-independent

Postscript programs can be run to generate output on a pixel screen, a vector screen, a fax machine, or almost any sort of printer mechanism, without the original program needing to be changed. Postscript output will look the same on any Postscript device, at least within the limits of the device's capabilities. Before the creation of PDF, people exchanged complex documents online as Postscript files. The only reason this standard didn't "stick" was because Windows machines didn't usually include a Postscript previewer, so Adobe specified hyperlinks and compression for Postscript, called the result PDF, distributed previewers for it, and invented a market for their "distiller" tools (the functionality of which is also provided by ghostscript's ps2pdf and pdf2ps programs).

It's a real programming language

Postscript is a complete programming language; you can write software to do most anything in it. This is mostly useful for defining subroutines at the start of your program to reproduce complex things over and over throughout your document, like a logo or a big "DRAFT" in the background. But there's no reason you couldn't compute π in a Postscript program.

It's open

Postscript is fully specified in a publically available series of books (which you can find at any good bookstore). Although Adobe invented it and provides the dominant commercial implementation, other vendors like Aladdin produce independently coded implementations as well.

## 5.2. Non-Postscript

Failing the (larger) budget necessary to buy a Postscript printer, you can use any printer supported by Ghostscript, the free Postscript interpreter used in lieu of actual printer Postscript support. Note that most Linux distributions can only ship a somewhat outdated version of Ghostscript due to the license. Fortunately, there is usually a prepackaged up to date Ghostscript made available in each distribution's contrib area.

Adobe now has a new printer language called "PrintGear". I think it's a greatly simplified binary format language with some Postscript heritage but no Postscript compatibility. And I haven't heard of Ghostscript supporting it. But some PrintGear printers seem to support another language like PCL, and these printers will work with Linux (iff the PCL is implemented in the printer and not in a Windows driver).

Similarly, Adobe offers a host-based Postscript implementation called PressReady. This works much like Ghostscript does to provide Postscript support for a non-Postscript printer, but has the disadvantage that it runs only on Windows.

## 5.3. What printers work?

If you want to buy a printer, you can look in several places to see if it will work. The cooperatively maintained Printing HOWTO printer database aims to be a comprehensive listing of the state of Linux printer support. A summary of it is below; be sure to check online for more details and information on what driver(s) to use.

Ghostscript's printer compatibility page has a list of some working printers, as well as links to other pages.

Dejanews contains hundreds of "it works" and "it doesn't work" testimonials. Try all three, and when you're done, check that your printer is present and correct in the database, so that it will be listed properly in this document in the future.

If you're lazy, I keep a short list of suggested printers on my website. These center around color inkjets and low-cost laser devices; fully compatible mid-range and high-end devices are much easier to find. You can even help support this document and the website by buying from buy.com or outpost.com through me.

### 5.3.1. Printer compatibility list

This section is a summary of the online database. The online version includes device specifications, notes, driver information, user-maintained documentation, manufacturer web pages, and interface scripts for using drivers with several print spooling systems (including LPR, LPRng, PDQ, and CUPS). The online version of this list is also interactive; people can and do add printers all the time, so be sure to check it as well. Finally, if your printer isn't listed, add it!

Note that this listing is not gospel; people sometimes add incorrect information, which I eventually weed out. Entries I have not sanity-checked are marked with an asterisk (*). Verify from Dejanews that a printer works for someone before buying it based on this list. If you can find no information in Dejanews, mail me and I'll put you in contact with the person who added the printer.

Printers here are categorized into three types:

Perfectly

Perfect printers work perfectly - you can print to the full ability of the printer, including color, full resolution, etc. In a few cases printers with undocumented "resolution enhancement" modes that don't work are listed as perfect; generally the difference in print quality is small enough that it isn't worth worrying about.

Mostly

You can print fine, but there may be minor limitations of one sort or another in either printing or other features.

Partially

You can print, but maybe not in color, or only at a poor resolution. See the online listing for information on the limitation.

Paperweight

You can't print a darned thing; typically this will be due to lack of a driver and/or documentation on how to write one. Paperweights occasionally get "promoted", either when someone discovers that an existing driver works, or when someone creates a new driver, but you shouldn't count on this happening.

In all cases, since this information is provided by dozens of people, none of it is guaranteed to be correct; entries with an asterisk (*) are particularly suspect. The facts, however, should be easy to corroborate from the driver web pages and manufacturer web sites.

And without further ado, here is the printer compatibility list:

Table 1. Linux Printer Support

Manufacturer

Perfectly

Mostly

Partially

Paperweight

Alps

 MD-1000 MD-1300 MD-2000 MD-4000 MD-5000

Apollo

 P-1200

Apple

 12/640ps Dot Matrix ImageWriter ImageWriter LQ LaserWriter 16/600* LaserWriter IINTX* LaserWriter IIg LaserWriter Select 360

 Color StyleWriter 1500 Color StyleWriter 2200 Color StyleWriter 2400 Color StyleWriter 2500 LaserWriter NT StyleWriter 1200 StyleWriter I StyleWriter II

Avery

 Personal Label Printer+

 Personal Label Printer

Brother

 HL-4Ve HL-8 HL-10V HL-10h HL-630 HL-660 HL-720 HL-730 HL-760 HL-820 HL-1020 HL-1040 HL-1070* HL-1250 HL-1260 HL-1270N HL-1660e HL-2060

 HJ-400 HL-1050 HL-1060 HL-1240

 DCP-1200 HL-1030* MC-3000 MFC 7150C MFC-4350 MFC-6550MC MFC-8300 MFC-9100c MFC-9500 MFC-9600

 4550* MP-21C

C.Itoh

 M8510

CalComp

 Artisan 1023 penplotter*

Canon

 BJ-5 BJ-10e BJ-20 BJ-200 BJ-330 BJC-70 BJC-210 BJC-250 BJC-600 BJC-610 BJC-620 BJC-800 BJC-4000 BJC-4100 BJC-4200 BJC-4300* BJC-4400* GP 335 GP 405 LBP-4+ LBP-4U LBP-8A1 LBP-430 LBP-1260 LBP-1760 LIPS-III

 BJC-80 BJC-240 BJC-1000* BJC-2000* BJC-2100 BJC-3000 BJC-4310SP BJC-7004* LBP-4sx

 BJ-300 BJC-210SP BJC-4550 BJC-6000* BJC-6100 BJC-7000* BJC-7100* BJC-8200 MultiPASS C2500* MultiPASS C3000 MultiPASS C3500* MultiPASS C5000* MultiPASS C5500

 BJC-5000 BJC-5100 BJC-6500 BJC-8000 LBP-460* LBP-600 LBP-660* Multipass L6000*

Citizen

 ProJet II* ProJet IIc

 printiva600C

Compaq

 IJ300 IJ750 IJ900

DEC

 DECWriter 500i* DECwriter 110i* DECwriter 520ic* LA50* LA75* LA75 Plus* LN03* LN07*

 LJ250* LN17

 1800*

Dymo-CoStar

 ASCII 250* ASCII+* EL40* EL60* LabelWriter II* LabelWriter XL* LabelWriter XL+* SE250* SE250+* Turbo*

Epson

 Action Laser II ActionLaser 1100* ActionPrinter 3250 Dot Matrix L-1000* LP 8000 LQ-24 LQ-500 LQ-570+ LQ-850 LQ-2550 LX-1050 SQ 1170 Stylus Color Stylus Color 400 Stylus Color 440 Stylus Color 460 Stylus Color 480 Stylus Color 500 Stylus Color 600 Stylus Color 640 Stylus Color 660 Stylus Color 740 Stylus Color 760 Stylus Color 800 Stylus Color 860 Stylus Color 880 Stylus Color 900 Stylus Color 980 Stylus Color 1160 Stylus Color 1500 Stylus Color 1520 Stylus Color 3000 Stylus Color I Stylus Color PRO Stylus Photo Stylus Photo 700 Stylus Photo 720 Stylus Photo 750 Stylus Photo 870 Stylus Photo 1200 Stylus Photo 1270 Stylus Photo EX

 EPL-5700 Stylus Color 300 Stylus Color 670* Stylus Color 850 Stylus Color II Stylus Color IIs Stylus Pro XL

 Stylus Photo 2000P

 EPL-5700L

Fujitsu

 1200* 2400* 3400* PrintPartner 10V* PrintPartner 16DV* PrintPartner 20W* PrintPartner 8000*

HP

 2000C 2500C Color LaserJet 4500 DesignJet 3500CP DeskJet DeskJet 400 DeskJet 420C DeskJet 500 DeskJet 500C DeskJet 510 DeskJet 520 DeskJet 540 DeskJet 550C DeskJet 560C DeskJet 600 DeskJet 1200C DeskJet 1600C DeskJet 1600CM LaserJet LaserJet 2 w/PS* LaserJet 2D LaserJet 2P LaserJet 2P Plus LaserJet 3 LaserJet 3D LaserJet 3P w/PS LaserJet 4 Plus LaserJet 4L LaserJet 4M LaserJet 4ML* LaserJet 4P LaserJet 5 LaserJet 5L* LaserJet 5M* LaserJet 5MP* LaserJet 5P* LaserJet 6 LaserJet 6L* LaserJet 6MP* LaserJet 1100 LaserJet 2100 LaserJet 2100M LaserJet 4050N LaserJet 5000 LaserJet 8000 LaserJet 8100 LaserJet Plus* LaserJet Series II* Mopier 240* Mopier 320* PaintJet* PaintJet XL* PaintJet XL300* ThinkJet*

 Color LaserJet 5 DesignJet 230* DesignJet 350C DesignJet 650C* Designjet 750 C Plus* DeskJet 310 DeskJet 610C DeskJet 610CL DeskJet 612C DeskJet 660C DeskJet 670C DeskJet 672C DeskJet 682C DeskJet 690C DeskJet 692C DeskJet 694C DeskJet 697C DeskJet 710C* DeskJet 712C DeskJet 720C* DeskJet 722C* DeskJet 810C DeskJet 812C DeskJet 815C* DeskJet 820C DeskJet 832C DeskJet 840C DeskJet 842C* DeskJet 850C DeskJet 855C DeskJet 870C DeskJet 870Cse* DeskJet 870Cxi DeskJet 880C DeskJet 882C DeskJet 895C DeskJet 895Cxi* DeskJet 932C DeskJet 950C* DeskJet 970C DeskJet 970Cse DeskJet 1100C DeskJet 1120C DeskJet 1220C LaserJet 2 LaserJet 6P LaserJet 4000 PSC 500*

 Color LaserJet 5000 DeskJet 320 DeskJet 340C DeskJet 890C DeskJet 930C DeskJet 1000C LaserJet 1100A OfficeJet 500* OfficeJet 600* OfficeJet 625* OfficeJet 635* OfficeJet 710* OfficeJet Pro 1170C* OfficeJet Pro 1175C* OfficeJet R45* OfficeJet R60 PhotoSmart P1000 PhotoSmart P1100*

 LaserJet 3100* LaserJet 3150

Heidelberg

 Digimaster 9110*

Hitachi

 DDP 70 (with MicroPress)*

IBM

 3853 JetPrinter* 4019* 4029 10P* 4303 Network Color Printer* Execjet 4072* Page Printer 3112* ProPrinterII*

Imagen

 ImPress*

Infotec

 infotec 4651 MF*

Kodak

 DigiSource 9110* IS 70 CPII*

Kyocera

 F-3300 FS-600* FS-600 (KPDL-2)* FS-680* FS-800* FS-1200* FS-1700+* FS-1750* FS-3750* FS-5900C* P-2000*

 F-800T* FS-3500*

Lexmark

 4039 10plus Optra Color 40 Optra Color 45 Optra Color 1200 Optra Color 1275 Optra E* Optra E+* Optra E310 Optra E312 Optra Ep* Optra K 1220* Optra R+* Optra S 1250* Optra S 1855* Optra Se 3455* Optra W810 Valuewriter 300* Z32

 1000 1100 2030 2070 3200 5000 5700 7000 7200 Winwriter 400* Z11* Z51

 1020 2050 Winwriter 100* Winwriter 150c* Winwriter 200* Z22 Z52*

Minolta

 PagePro 6* PagePro 6e* PagePro 6ex* PagePro 8*

 PagePro 8L*

 PagePro 6L

Mitsubishi

 CP50 Color Printer*

NEC

 P2X* PinWriter P6* PinWriter P6 plus* PinWriter P7* PinWriter P7 plus* PinWriter P60* PinWriter P70* SilentWriter LC 890* Silentwriter2 S60P* Silentwriter2 model 290* SuperScript 660i* SuperScript 1800

 Silentwriter 95f*

 SuperScript 100C* SuperScript 150C* SuperScript 650C* SuperScript 750C* SuperScript 860* SuperScript 870* SuperScript 1260*

 SuperScript 610plus* SuperScript 660* SuperScript 660plus*

Oce

 3165*

Okidata

 ML 380* OL 410e OL 600e* OL 610e/PS OL 800 OL 810e/PS OL400ex OL810ex OL820* OL830Plus Okipage 6e Okipage 6ex* Okipage 8c Okipage 8p Okipage 10e Okipage 12i Okipage 20DXn

 Microline 182 OL 400w* OL 610e/S OkiPage 4w+* OkiPage 8w Lite* OkiPage 8z* Okijet 2500* Okipage 4w* Okipage 8w* Super 6e

 Microline 192+ Okipage 6w*

 Okijet 2010

Olivetti

 JP350S* JP450* JP470* PG 306*

PCPI

 1030*

Panasonic

 KX-P1123* KX-P1124* KX-P1150* KX-P1180i* KX-P2023* KX-P2135* KX-P2150* KX-P4410* KX-P4450* KX-P5400* KX-P8420* KX-P8475* KX-PS600* kx-p1624*

 KX-P2123* KX-P6150*

 KX-P6500*

 KX-P6100* KX-P6300 GDI* KX-P8410*

Printrex

 820 DL*

QMS

 2425 Turbo EX* LPK-100*

 magicolor 2+* ps-810*

 magicolor 2

Raven

 LP-410

Ricoh

 4081* 4801* 6000* Aficio 220* Aficio AP2000

 Aficio 401*

 Aficio Color 2206* Afico FX10*

Samsung

 ML-85* ML-4600* ML-5000a* ML-6000/6100* ML-7000/7000P/7000N* ML-7050* QL-5100A* QL-6050* SI-630A*

 ML-85G QL-85G

 ML-5050G* SF/MSYS/MJ-4700/4800/4500C*

Seiko

 SpeedJET 200*

 SLP* SLP 120* SLP 220* SLP EZ30* SLP Plus* SLP Pro*

Sharp

 AR-161*

Star

 LC24-100* LS-04 NL-10*

 LC 90* LC24-200* StarJet 48*

 WinType 4000*

Tally

 MT908*

Tektronix

 3693d color printer, 8-bit mode* 4693d color printer, 2-bit mode* 4693d color printer, 4-bit mode* 4695* 4696* 4697* Phaser 780 Phaser 850* Phaser IISX* Phaser PX*

Xerox

 2700 XES 3700 XES 4045 XES* DocuPrint 4508 DocuPrint C20 DocuPrint C55* DocuPrint N17 DocuPrint N32* Document Centre 400*

 DocuPrint C6* DocuPrint P8e DocuPrint P12* Docuprint C6* Docuprint C8* XJ6C*

 Document Homecentre WorkCentre 450cp* WorkCentre 470cx* XJ8C*

 DocuPrint P8* Work Centre XK35c WorkCenter XE90fx* WorkCentre XD120f* WorkCentre XE80 workcentre 385*

* This entry has not been sanity-checked by me.

## 5.4. How to buy a printer

It's a bit difficult to select a printer these days; there are many models to choose from. Here are some shopping tips:

Cost

## 8.2. Configuring LPD

Most Linux systems ship with LPD. This section describes a very basic setup for LPD; further sections detail the creation of complex filters and network configuration.

### 8.2.1. Basic LPD configuration

The minimal setup for lpd results in a system that can queue files and print them. It will not pay any attention to wether or not your printer will understand them, and will probably not let you produce attractive output. But we have to start somewhere.

To add a print queue to lpd, you must add an entry in /etc/printcap, and make the new spool directory under /var/spool/lpd.

An entry in /etc/printcap looks like:
 # LOCAL djet500 lp|dj|deskjet:\ :sd=/var/spool/lpd/dj:\ :mx#0:\ :lp=/dev/lp0:\ :sh:
This defines a spool called lp, dj, or deskjet, spooled in the directory /var/spool/lpd/dj, with no per-job maximum size limit, which prints to the device /dev/lp0, and which does not have a banner page (with the name of the person who printed, etc) added to the front of the print job.

Go now and read the man page for printcap.

The above looks very simple, but there a catch - unless I send in files a DeskJet 500 can understand, this DeskJet will print strange things. For example, sending an ordinary Unix text file to a deskjet results in literally interpreted newlines, and gets me:
 This is line one. This is line two. This is line three.
ad nauseam. Printing a PostScript file to this spool would get a beautiful listing of the PostScript commands, printed out with this "staircase effect", but no useful output.

Clearly more is needed, and this is the purpose of filtering. The more observant of you who read the printcap man page might have noticed the spool attributes if and of. Well, if, or the input filter, is just what we need here.

If we write a small shell script called filter that adds carriage returns before newlines, the staircasing can be eliminated. So we have to add in an if line to our printcap entry above:
 lp|dj|deskjet:\ :sd=/var/spool/lpd/dj:\ :mx#0:\ :lp=/dev/lp0:\ :if=/var/spool/lpd/dj/filter:\ :sh:
A simple filter script might be:
 #!perl # The above line should really have the whole path to perl # This script must be executable: chmod 755 filter while(){chomp $_; print "$_\r\n";}; # You might also want to end with a form feed: print "\f";
If we were to do the above, we'd have a spool to which we could print regular Unix text files and get meaningful results. (Yes, there are four million better ways to write this filter, but few so illustrative. You are encouraged to do this more efficiently.)

The only remaining problem is that printing plain text is really not too hot - surely it would be better to be able to print PostScript and other formatted or graphic types of output. Well, yes, it would, and it's easy to do. The method is simply an extention of the above linefeed-fixing filter.

Such a filter is called a magic filter. It plays the same role as the language filters of PDQ. Don't bother writing one yourself unless you print strange things - there are a good many written for you already, and most have easy-to-use interactive configuration tools. You should simply select a suitable pre-written filter:

LPD-O-Matic

Lpdomatic is a filter designed to use data from the Linux Printing printer database. It will soon support essentially all free software printer drivers, including regular Ghostscript drivers, Uniprint drivers, and the assorted filter programs floating around out there. It works with various strains of LPD, including stock BSD, LPRng, and the new VA Linux LPD, to allow option selection.

APS Filter

apsfilter is a filter designed for use on a wide variety of Unices. It supports essentially all Ghostscript drivers. It, too, works with various strains of LPD, including stock BSD and LPRng. At the moment, this is probably the best third-party system around for non-PostScript printers.

RHS-Printfilters

RHS-Printfilters is a filter system constructed by Red Hat. It shipped beginning, I think, in version 4 of Red Hat Linux, as the backend to the easy-to-use printtool GUI printer configuration tool. Other distributions, including Debian, now ship the rhs-printfilters/printool combo as a printing option. Thus this filter system is arguably the most widely deployed one.

The rhs filter system is built on an ascii database listing distributed with it. This listing supports many Ghostscript and Uniprint drivers, but not filter-style drivers. The filters constructed also do not support much in the way of user-controllable options at print time.

The printtool places a configuration file named postscript.cfg in the spool directory. Inside this Bourne shell-style file, each setting is a variable. In unusual cases, you can make useful changes directly to the config file which the printtool won't allow; typically this would be the specification of an unusual Ghostscript driver, or a PPD filename for the VA rhs-printfilters version.

VA Linux has made some enhancements to the rhs-printfilters system under contract from HP. With the proper versions, it is now possible to select options for Postscript printers under control of Adobe PPD files. I cover this system in Section 8.2.2.

There's one catch to such filters: older version of lpd don't run the if filter for remote printers, while most newer ones do (although often with no arguments). The version of LPD shipped with modern Linux and FreeBSD distributions does; most commercial unices that still ship LPD have a version that does not. See the section on network printing later in this document for more information on this. If you only have locally-connected printers, then this won't affect you.

### 8.2.2. LPD for PostScript Printers

While most versions of LPD don't gracefully handle PostScript (nevermind user options), VA Linux recently modified LPD and Red Hat's filtering software to support PostScript printers fairly well. For the moment, this system works only with Red Hat 6.2, although the packages could be easily adapted for other distributions.

#### 8.2.2.1. How it works

VA's new system uses Postscript Printer Definition, or PPD, files. PPD files are provided by printer manufacturers and declare the available options on a printer, along with the Postscript code needed to activate them. With the VA system, the normal LPD scheme works a little differently:

1. The user can specify options with the -o flag. For example, you might specify -o MediaType:Transparency if you were about to print on overhead film. Alternatively, the front-end GPR can be used to specify options in a dialog box; you can see screenshots of GPR in Section 3.3.1.

2. LPR passes the options to LPD as an extended attribute in the LPD control file.

3. A modified version of the rhs-printfilters package is given the extended options data in an environment variable, and uses ppdfilt to add these options to the print data.

#### 8.2.2.2. Obtaining and Installing

You can obtain RPM packages, or source tarballs, from the project's website on SourceForge. For installation details, consult the project's installation micro-HOWTO. In essence, you need to uninstall the Red Hat version of printtool, lpd, and rhs-printfilters entirely, and then install the VA versions, plus ppdfilt, gpr, and a few other utilities.

You will also need PPD files for your Postscript printers. PPD files are usually fairly easy to find. VA Linux and HP distribute PPD files for many Laserjet models. Other vendors provide PPDs for their own printers, and Adobe distributes PPD files for many printers.

At the moment, much of this is a bit difficult to install. But future installation tools will build upon the printer configuration library libprinterconf, which enables both the autodetection and rhs-printfilter configuration of both networked and local printers.

Note: It is possible to use GPR alone, without the modified LPD or even rhs-printfilters. GPR can be compiled with all the logic needed to massage Postscript jobs directly. This may be an easier-to-install option suitable for people who never really need to print using lpr directly.

#### 8.2.2.3. Controlling Postscript Options

Once you've setup VA's Postscript-capable LPD system, you can control your printer's options in two ways:

With the GUI

To use GPR, you first make sure that you've specified the proper PPD file. Then the printer's options will be available on the Advanced' panel. Basic ppdfilt options will be available on the Common' panel.

With the command line

This lpr supports the -o option. You may specify any option/value pair from your printer's PPD file with -o. For example, consider this PPD file option clause:
 *OpenUI *PrintQuality/Print Quality: PickOne *DefaultPrintQuality: None *OrderDependency: 150 AnySetup *PrintQuality *PrintQuality None/Printer Setting: "" *PrintQuality Quick/QuickPrint: "<< /DeviceRenderingInfo ... *PrintQuality Normal/Normal: "<< /DeviceRenderingInfo << /... *PrintQuality Pres/Presentation: "<< /DeviceRenderingInfo ... *PrintQuality Image/1200 Image Quality: "<< /DeviceRenderi... *CloseUI: *PrintQuality
For the option PrintQuality, the possible values are Quick, Normal, Pres, or Image. You might give a command like:
 % lpr -o PrintQuality:Image file.ps

There are a number of options common to all printers which will work in addition to the ones from your PPD. These include:

page-ranges

You can specify a range of pages to print. For example, page-ranges:2-3.

page-set

You can print only odd or even pages. For example, page-set:odd.

number-up

You can print multiple pages on each piece of paper. For example, number-up:2.

Other options are detailed in the ppdfilt man page.

### 8.2.3. File Permissions

By popular demand, I include below a listing of the permissions on interesting files on my system. There are a number of better ways to do this, ideally using only SGID binaries and not making everything SUID root, but this is how my system came out of the box, and it works for me. (Quite frankly, if your vendor can't even ship a working lpd you're in for a rough ride).
 -r-sr-sr-x 1 root lp /usr/bin/lpr* -r-sr-sr-x 1 root lp /usr/bin/lprm* -rwxr--r-- 1 root root /usr/sbin/lpd* -r-xr-sr-x 1 root lp /usr/sbin/lpc* drwxrwxr-x 4 root lp /var/spool/lpd/ drwxr-xr-x 2 root lp /var/spool/lpd/lp/

Lpd must currently be run as root so that it can bind to the low-numbered lp service port. It should probably become UID lp.lp or something after binding, but I don't think it does. This is simply one more reason to avoid the stock BSD LPD.

PDQ uses a different, non-daemon-centric scheme, so it has different programs. The only SUID root programs are the lpd interface programs lpd_cancel, lpd_print, and lpd_status; these are SUID because actual Unix print servers require print requests to originate from a priviledged port. If the only printers for which you use PDQ's bsd-lpd interface are networked print servers (like the HP JetDirect or Lexmark's MarkNet adapters) then you do not need the SUID bit on these programs.

## 8.3. Large Installations

Large installations, by which I mean networks including more than two printers or hosts, have special needs. Below are some tips. For really large environments, merely distributing printcap/filter information becomes a difficult problem; the Cisco Enterprise Print System addresses this and is probably either a good starting point or a nearly complete solution, depending on your needs. Medium to large environments can be well supported by native LPRng features.

• Each printer should have a single point of control, where an administrator can pause, reorder, or redirect the queue. To implement this, have everyone printing to a local server, which will then queue jobs and direct them to the proper printer. For large campuses or distributed networks, have one server per building or other suitable network subset.

• Use LPRng, at least on servers; the BSD LPD is too buggy for "real" use. So is CUPS, at least right now in mid-2000. But don't take my word for it—you should test a number of spoolers and see which suits you best.

• Client systems should not have unique printing configurations. To implement this, use LPRng's extended printcap syntax so that you have one printcap to use everywhere. CEPS provides for this by building atop a lightweight distributed database instead of traditional printcap files.

• Print queues should not be named for make or model; name print queues for something sensible like location (floor2_nw) or capability (color_transparency). Three years from now, when a printer breaks, you will be able to replace it with a different make or model without causing confusion.

• Operate a web page which shows detailed information on each printer, including location, capabilities, etc. Consider having it show the queue and include a button to remove jobs from the queue. Complex networked environments are unmanagable for users without proper documentation.

• On Unix systems, use PDQ or the like to allow selection of print job attributes such as duplex or paper size, and to force users to run all Ghostscript processing under the proper user ID. If you have all Postscript printers (as is best), you can also select from the GPR or XPP front-ends; both are prettier.

• On Windows and Apple systems, use either the platform-specific drivers everywhere (Samba supports the Windows automagical driver-download mechanism) or, better, use generic Postscript drivers everywhere. Do not mix and match; primitive word processors often produce different output when the installed printer driver changes; users cannot deal with output that vaires depending on the particular client/printer pair.

• If at all possible, buy a large-volume printer for large-volume printing. If on a budget, use LPRng's multiple printers/one queue facility and assign a babysitter; printers are complex mechanical devices that will often jam and run out of paper in such configurations.

• Do not feel that printers must be plugged into workstations; Ethernet "print servers" now cost under $100. The ability to locate printers anywhere you can network is a big improvement over forced location near a host; locate printers in sensible, central locations. • Use any SNMP trap or other monitoring/alert facility available to you - someone should be tasked with running around and fixing printers with no ink or paper. Npadmin (see Section 11.10.1) can be used to do some management operations with SNMP printers. ## 8.4. Accounting Regular LPD provides very little to help you with accounting. You can specify the name of an accounting file in the af printcap attribute, but this is merely passed as an argument to your if filter. It's up to you to make your if filter write entries to the accounting file, and up to you to process the accounting file later (the traditional format is mainly useful for line printers, and is nontrivial to parse in Perl, so there's no reason to preserve it). Also, if you're using my lpdomatic program as your filter, you'll need to make changes, since it depends on being given a configuration file as the accounting'' file name. Ghostscript provides a PageCount operator that you can use to count the number of pages in each job; basically you just tack a few lines of postscript onto the end of the job to write an accounting file entry; for the best example of this see the file unix-lpr.sh in the Ghostscript source distribution. Note that the unix-lpr implementation of accounting writes to a file from the Ghostscript interpreter, and is thus incompatible with the recommended -dSAFER option. A better solution might be to query the printer with a PJL command after each job, or to write a postscript snippet that prints the pagecount on stdout, where it can be captured without having to write to a file. The LPRng print spooler includes an HP-specific sample implementation of accounting; I assume that it queries the printer with PJL. This technique should work for most PJL, Postscript, or SNMP printers with which you have two-way communications. If you have a networked printer that supports SNMP, you can use the npadmin program to query a pagecount after each job. This should work properly for all print jobs. See Section 11.10.1 for more information on npadmin. # 9. Vendor Solutions This section is, by definition, incomplete. Feel free to send in details of your favourite distribution. At the moment, I am aware of no distribution that supports, or even provides, the software I recommend: PDQ. There are a number of third-party packages out there designed to make printer configuration under Unix easy. These are covered in Section 8; see the subsection there for your particular spooling software for pointers. ## 9.1. Red Hat Red Hat has a GUI printer administration tool called printtool which can add remote printers and printers on local devices. It lets you choose a ghostscript-supported printer type and Unix device file to print to, then installs a print queue in /etc/printcap and uses a filter program from the rhs-printfilters package to support postscript and other common input types. This solution works fairly well, and is trivial to setup for common cases. Where Red Hat fails is when you have a printer which isn't supported by their standard Ghostscript (which is GNU rather than Aladdin Ghostscript, and which supports fewer printers). Check in the printer compatibility list above (or online) if you find that you can't print properly with the stock Red Hat software. If your printer isn't supported by Red Hat's tools, you may need to install a contributed verison of Aladdin Ghostscript, and will probably also be better off if you use the lpdomatic or apsfilter packages, which know all about the printers supported by late-model Ghostscripts, and others besides. In future versions of Red Hat the printtool will be reimplemented to support a larger list of printers and with the intent to support an eventual rhs-printfilters replacement (the current filter has difficulty with many common printers like some non-PCL DeskJets and most Lexmarks). Some VA Linux-developed PPD features may be incorporated, as well. ## 9.2. Debian Debian offers a choice between plain LPD, LPRng, or CUPS; LPRng or CUPS are probably the better choices. I believe Debian also offers a choice of printer configuration tools; apsfilter version 5 or later is probably your best bet, since that verison adds support for LPRng and Ghostscript's uniprint driver scheme. Red Hat's printtool is also supported, for those who like GUI administration tools. ## 9.3. SuSE The printing system on SuSE Linux is based on apsfilter, with some enhancements; SuSE's apsfilter will recognize all common file formats (including HTML, if html2ps is installed). There are two ways to setup printers on SuSE systems: • YaST will let you configure "PostScript", "DeskJet" and "Other printers", supported by Ghostscript drivers; it's also possible to setup HP's GDI printers (DeskJet 710/720, 820, 1000, via the "ppa" package). YaST will provide /etc/printcap entries for every printer ("raw", "ascii", "auto" and "color", if the printer to configure is a color printer). YaST will create spool directories and it will arrange apsfilterrc files, where you're able to fine tune some settings (Ghostscript preloads, paper size, paper orientation, resolution, printer escape sequences, etc.). With YaST it's also possible to setup network printers (TCP/IP, Samba, or Novell Netware Printer). • In addition SuSE includes the regular SETUP program from the original apsfilter package (with some enhancements); run lprsetup to invoke this configuration script. Once you get accustomed to its GUI, you'll be able to configure local and network printers. The SuSE installation manual explains both of these setup procedures. Wolf Rogner reported some difficulties with SuSE. Apparently the following bugs may bite: • Apsfilter's regular SETUP script is a bit broken, as are the KDE setup tools. Use YaST. [ Ed: does this still apply? It's been some time sice Wolf's report. ] • For networked printers that need to be fed from Ghostscript, you'll need to first uncomment the line REMOTE_PRINTER="remote" in /etc/apsfilterrc. Then run YaST to configure the printer and, under Network configurations, set up a remote printer queue. • YaST's setup doesn't allow color laser printers, so configure a mono printer and then change mono to color everwhere in the printcap entry. You may have to rename the spool directory, too. ## 9.4. Caldera Caldera ships LPRng. I have no idea what sort of setup tools they offer. ## 9.5. Corel Corel is Debian-based, so all the Debian facts above should still apply. In addition, they've written their own setup tool, based on the sysAPS library which in turn uses my database. They've certainly done so as part of WordPerfect. Corel operates a printing support newsgroup named corelsupport.linux.printing. The bulk of the traffic appears to be WordPerfect and Corel Linux related. ## 9.6. Mandrake As of version 7.2b1, Mandrake ships with CUPS standard. The program QtCUPS is used to provide a clean GUI administration interface. Till went to some trouble to include as many drivers as possible, and they ship CUPS PPD files build with my own foomatic interface code. I think Earlier Mandrake versions shipped with the Red Hat printtool. ## 9.7. Other Distributions Please send me info on what other distributions do! # 10. Ghostscript. Ghostscript is an incredibly significant program for Linux printing. Most printing software under Unix generates PostScript, which is typically a$100 option on a printer. Ghostscript, however, is free, and will generate the language of your printer from PostScript. When tied in with your PDQ printer driver declaration or lpd input filter, it gives you a virtual PostScript printer and simplifies life immensely.

Ghostscript is available in two forms. The commercial version of Ghostscript, called Aladdin Ghostscript, may be used freely for personal use but may not be distributed by commercial entities. It is generally a year or so ahead of the free Ghostscript; at the moment, for example, it supports many color inkjets that the older Ghostscripts do not and has rather better PDF support.

The free version of Ghostscript is GNU Ghostscript, and is simply an aged version of Aladdin ghostscript. This somewhat awkward arrangement has allowed Aladdin to be a totally self-funded free software project; the leading edge versions are done by L Peter and a few employees, and are licensed to hardware and software vendors for use in commercial products. Unfortunately, while this scheme has provided for L Peter's continued work on Ghostscript for years, it has also inhibited the participation of the wider free software community. Driver authors, in particular, find the arrangement poor. L Peter's retirement plans mandate a larger community involvement in the project, so he is considering license changes, and has established a SourceForge project.

Whatever you do with gs, be very sure to run it with the option for disabling file access (-dSAFER). PostScript is a fully functional language, and a bad PostScript program could give you quite a headache.

Speaking of PDF, Adobe's Portable Document Format (at least through 1.3) is actually little more than organized PostScript in a compressed file. Ghostscript can handle PDF input just as it does PostScript. So you can be the first on your block with a PDF-capable printer.

## 10.1. Invoking Ghostscript

Typically, Ghostscript will be run by whatever filter you settle upon (I recommend apsfilter or my own lpdomatic if your vendor didn't supply anything that suits you), but for debugging purposes it is often handy to run it directly.

gs -help will give a brief listing of options and available drivers (note that this list is the list of drivers compiled in, not the master list of all available drivers).

You might run gs for testing purposes like: gs <options> -q -dSAFER -sOutputFile=/dev/lp1 test.ps'.

## 10.2. Ghostscript output tuning

There are a number of things one can do if Ghostscript's output is not satisfactory (actually, you can do anything you darn well please, since you have the source).

Some of these options, and others are described in the Ghostscript User Guide (the file Use.htm in the Ghostscript distribution; possibly installed under /usr/doc or /usr/share/doc on your system) are all excellent candidates for driver options in your filter system or PDQ driver declaration.

### 10.2.1. Output location and size

The location, size, and aspect ratio of the image on a page is controlled by the printer-specific driver in ghostscript. If you find that your pages are coming out scrunched too short, or too long, or too big by a factor of two, you might want to look in your driver's source module and adjust whatever parameters jump out at you. Unfortunately, each driver is different, so I can't really tell you what to adjust, but most of them are reasonably well commented.

### 10.2.2. Gamma, dotsizes, etc.

Most non-laser printers suffer from the fact that their dots are rather large. This results in pictures coming out too dark. If you experience this problem with an otherwise untunable driver, you could use your own transfer function. Simply create the following file in the ghostscript lib-dir and add its name to the gs call just before the actual file. You may need to tweak the actual values to fit your printer. Lower values result in a brighter print. Especially if your driver uses a Floyd-Steinberg algorithm to rasterize colors, lower values ( 0.2 - 0.15 ) are probably a good choice.

 %! %transfer functions for cyan magenta yellow black {0.3 exp} {0.3 exp} {0.3 exp} {0.3 exp} setcolortransfer

It is also possible to mend printers that have some kind of color fault by tweaking these values. If you do that kind of thing, I recommend using the file colorcir.ps, that comes with ghostscript (in the examples/ subdirectory), as a test page.

For many of the newer color inkjet drivers, there are command-line options, or different upp driver files, which implement gamma and other changes to adapt the printer to different paper types. You sould look into this before playing with Postscript to fix things.

### 10.2.3. Color Printing in Ghostscript

Ghostscript's default color dithering is optimized for low-resolution devices. It will dither rather coarsely in an attempt to produce 60ppi output (not dpi, ppi - the "apparent" color pixels per inch you get after dithering). This produces rather poor output on modern color printers; inkjets with photo paper, in particular, are capable of mich finer ppi settings.

To adjust this, use the Ghostscript option -dDITHERPPI=x, where x is the value to use. This may or may not have an effect with all drivers; many newer drivers (the Epson Stylus stp driver, for example) implement their own dithering and pay no attention to this setting. Some drivers can use either the regular Ghostscript or driver-specific dithering (the Canon Bubblejet bjc600 driver, for example).

Ghostscript's dithering is in fact rather rudimentary. Many things needed for good output on modern printers are simply not available in the Ghostscript core. Various projects to fix this situation—and the free software world does have the software to do so ready and waiting—are hampered by Ghostscript's licensing situation and the resulting "cathedral" development style. Beginning at the Open Source Printing Summit 2000, however, all the necessary people are talking, so you can expect this situation to improve shortly.

# 11. Networks

One of the features of most spoolers is that they support printing over the network to printers physically connected to a different machine, or to the network directly. With the careful combination of filter scripts and assorted utilities, you can print transparently to printers on all sorts of networks.

## 11.1. Printing to a Unix/lpd host

To allow remote machines to print to your printer using the LPD protocol, you must list the machines in /etc/hosts.equiv or /etc/hosts.lpd. (Note that hosts.equiv has a host of other effects; be sure you know what you are doing if you list any machine there). You can allow only certain users on the other machines to print to your printer by usign the rs attribute; read the lpd man page for information on this.

### 11.1.1. With pdq

With PDQ, you define a printer with the interface type "bsd-lpd". This interface takes arguments for the remote hostname and queue name; the printer definition wizard will prompt you for these.

### 11.1.2. With lpd

To print to another machine, you make an /etc/printcap entry like this:
 # REMOTE djet500 lp|dj|deskjet:\ :sd=/var/spool/lpd/dj:\ :rm=machine.out.there.com:\ :rp=printername:\ :sh:
Note that there is still a spool directory on the local machine managed by lpd. If the remote machine is busy or offline, print jobs from the local machine wait in the spool area until they can be sent.

### 11.1.3. With rlpr

You can also use rlpr to send a print job directly to a queue on a remote machine without going through the hassle of configuring lpd to handle it. This is mostly useful in situations where you print to a variety of printers only occasionally. From the announcement for rlpr:

Rlpr uses TCP/IP to send print jobs to lpd servers anywhere on a network.

Unlike lpr, it *does not* require that the remote printers be explicitly known to the machine you wish to print from, (e.g. through /etc/printcap) and thus is considerably more flexible and requires less administration.

rlpr can be used anywhere a traditional lpr might be used, and is backwards compatible with traditional BSD lpr.

The main power gained by rlpr is the power to print remotely *from anywhere to anywhere* without regard for how the system you wish to print from was configured. Rlpr can work as a filter just like traditional lpr so that clients executing on a remote machine like netscape, xemacs, etc, etc can print to your local machine with little effort.

Rlpr is available from Metalab.

## 11.2. Printing to a Windows or Samba printer

There is a Printing to Windows mini-HOWTO out there which has more info than there is here.

### 11.2.1. From PDQ

There is not a prebuilt smb interface that I am aware of, but it would be fairly easy to create using the model set by the Netatalk-based appletalk interface. Someone please create one and submit it for inclusion!

Read the Windows/LPD section below for more tips on how to do it.

### 11.2.2. From LPD

It is possible to direct a print queue through the smbclient program (part of the samba suite) to a TCP/IP based SMB print service. Samba includes a script to do this called smbprint. In short, you put a configuration file for the specific printer in question in the spool directory, and install the smbprint script as the if.

The /etc/printcap entry goes like this:
 lp|remote-smbprinter:\ :sh:\ :lp=/dev/null:\ :sd=/var/spool/lpd/lp:\ :if=/usr/local/sbin/smbprint:

You should read the documentation inside the smbprint script for more information on how to set this up.

You can also use smbclient to submit a file directly to an SMB printing service without involving lpd. See the man page.

## 11.3. Printing to a NetWare Printer

The ncpfs suite includes a utility called nprint which provides the same functionality as smbprint but for NetWare. You can get ncpfs from Metalab. From the LSM entry for version 0.16:

" With ncpfs you can mount volumes of your netware server under Linux. You can also print to netware print queues and spool netware print queues to the Linux printing system. You need kernel 1.2.x or 1.3.54 and above. ncpfs does NOT work with any 1.3.x kernel below 1.3.54. "

### 11.3.1. From LPD

To make nprint work via lpd, you write a little shell script to print stdin on the NetWare printer, and install that as the if for an lpd print queue. You'll get something like:
 sub2|remote-NWprinter:\ :sh:\ :lp=/dev/null:\ :sd=/var/spool/lpd/sub2:\ :if=/var/spool/lpd/nprint-script:
The nprint-script might look approximately like:
 #! /bin/sh # You should try the guest account with no password first! /usr/local/bin/nprint -S net -U name -P passwd -q printq-name -

## 11.4. Printing to an EtherTalk (Apple) printer

The netatalk package includes something like nprint and smbclient. Others have documented the procedure for printing to and from an Apple network far better than I ever will; see the Linux Netatalk-HOWTO.

### 11.4.1. From PDQ

PDQ includes an interface declaration called "appletalk". This uses the Netatalk package to print to a networked Apple printer. Just select this interface in xpdq's "Add printer" wizard.

## 11.5. Printing to a networked printer

Many printers come with an ethernet interface which you can print to directly, typically using the LPD protocol. You should follow the instructions that came with your printer or its network adaptor, but in general, such printers are "running" lpd, and provide one or more queues which you can print to. An HP, for example, might work with a printcap like:
 lj-5|remote-hplj:\ :sh:\ :sd=/var/spool/lpd/lj-5:\ :rm=printer.name.com:\ :rp=raw:
or, using the PDQ bsd-lpd interface arguments of REMOTE_HOST=printer.name.com and QUEUE=raw.

HP Laserjet printers with JetDirect interfaces generally support two built in lpd queues - "raw" which accepts PCL (and possibly Postscript) and "text" which accepts straight ascii (and copes automatically with the staircase effect). If you've got a JetDirect Plus3 three-port box, the queues are named "raw1", "text2", and so forth.

Note that the ISS company has identified an assortment of denial of service attacks which hang HP Jetdirect interfaces. Most of these have been addressed beginning in Fall 98. These sorts of problems are common in embedded code; few appliance-style devices should be exposed to general Internet traffic.

In a large scale environment, especially a large environment where some printers do not support PostScript, it may be useful to establish a dedicated print server to which all machines print and on which all ghostscript jobs are run. This will allow the queue to be paused or reordered using the topq and lprm commands.

This also allows your Linux box to act as a spool server for the printer so that your network users can complete their print jobs quickly and get on with things without waiting for the printer to print any other job that someone else has sent. This is suggested too if you have unfixable older HP Jetdirects; it reduces the likelihood of the printers wedging.

To do this, set up a queue on your linux box that points at the ethernet equipped HP LJ (as above). Now set up all the clients on your LAN to point at the Linux queue (eg lj-5 in the example above).

Some HP network printers apparently don't heed the banner page setting sent by clients; you can turn off their internally generated banner page by telnetting to the printer, hitting return twice, typing "banner: 0" followed by "quit". There are other settings you can change this way, as well; type "?" to see a list.

The full range of settings can be controlled with HP's webJetAdmin software. This package runs as a daemon, and accepts http requests on a designated port. It serves up forms and Java applets which can control HP printers on the network. In theory, it can also control Unix print queues, but it does so using the rexec service, which is completely unsecure. I don't advise using that feature.

### 11.5.1. To AppSocket Devices

Some printers (and printer networking "black boxes") support only a cheesy little non-protocol involving plain TCP connections; this is sometimes called the "AppSocket" protocol. Notable in this category are early-model JetDirect (including some JetDirectEx) cards. Basically, to print to the printer, you must open a TCP connection to the printer on a specified port (typically 9100, or 9100, 9101 and 9102 for three-port boxes) and stuff your print job into it. LPRng has built-in support for stuffing print jobs into random TCP ports, but with BSD lpd it's not so easy. The best thing is probably to obtain and use the little utility called netcat.

A netcat-using PDQ interface would look something like this:
 interface tcp-port-0.1 { help "This is one of the first interfaces supported by standalone network printers and print servers. The device simply listens for a TCP connection on a certain port, and sends data from any connection to the printer.\nThis interface requires the netcat program (\"nc\")." required_args "REMOTE_HOST" argument { var = "REMOTE_HOST" desc = "Remote host" help = "This is IP name or number of the print server." } argument { var = "REMOTE_PORT" def_value = "9100" desc = "Remote port" help = "This is the TCP port number on the print server that the print job should be sent to. Most JetDirect cards, and clones, accept jobs on port 9100 (or 9101 for port 2, etc)." } requires "nc" send_exec { cat $OUTPUT | nc$REMOTE_HOST $REMOTE_PORT } } Failing that, it can be implemented, among other ways, in Perl using the program below. For better performance, use the program netcat ("nc"), which does much the same thing in a general purpose way. Most distributions should have netcat available in prepackaged form.  #!/usr/bin/perl # Thanks to Dan McLaughlin for writing the original version of this # script (And to Jim W. Jones for sitting next to Dan when writing me # for help ;)$fileName = @ARGV[0]; open(IN,"$fileName") || die "Can't open file$fileName"; $dpi300 = "\x1B*t300R";$dosCr = "\x1B&k3G"; $ends = "\x0A";$port = 9100 unless $port;$them = "bach.sr.hp.com" unless $them;$AF_INET = 2; $SOCK_STREAM = 1;$SIG{'INT'} = 'dokill'; $sockaddr = 'S n a4 x8'; chop($hostname = hostname); ($name,$aliases,$proto) = getprotobyname('tcp'); ($name,$aliases,$port) = getservbyname($port,'tcp') unless$port =~ /^\d+$/;; ($name,$aliases,$type,$len,$thisaddr) = gethostbyname($hostname); ($name,$aliases,$type,$len,$thataddr) = gethostbyname($them);$this = pack($sockaddr,$AF_INET, 0, $thisaddr);$that = pack($sockaddr,$AF_INET, $port,$thataddr); if (socket(S, $AF_INET,$SOCK_STREAM, $proto)) { # print "socket ok\n"; } else { die$!; } # Give the socket an address. if (bind(S, $this)) { # print "bind ok\n"; } else { die$!; } # Call up the server. if (connect(S,$that)) { # print "connect ok\n"; } else { die$!; } # Set socket to be command buffered. select(S); $| = 1; select(STDOUT); # print S "@PJL ECHO Hi$hostname! $ends"; # print S "@PJL OPMSG DISPLAY=\"Job$whoami\" $ends"; # print S$dpi300; # Avoid deadlock by forking. if($child = fork) { print S$dosCr; print S $TimesNewR; while () { print S; } sleep 3; do dokill(); } else { while() { print; } } sub dokill { kill 9,$child if $child; } ## 11.6. Running an if for remote printers with old LPDs One oddity of older versions of lpd is that the if is not run for remote printers. (Versions after 0.43 or so have the change originated on FreeBSD such that the if is always run). If you find that you need to run an if for a remote printer, and it isn't working with your lpr, you can do so by setting up a double queue and requeueing the job. As an example, consider this printcap:  lj-5:\ :lp=/dev/null:sh:\ :sd=/var/spool/lpd/lj-5:\ :if=/usr/lib/lpd/filter-lj-5: lj-5-remote:sh:rm=printer.name.com:\ :rp=raw:sd=/var/spool/lpd/lj-5-raw: in light of this filter-lj-5 script:  #!/bin/sh gs -q -dSAFER -sOutputFile=- - | \ lpr -Plj-5-remote -U$5

The -U option to lpr only works if lpr is run as daemon, and it sets the submitter's name for the job in the resubmitted queue correctly. You should probably use a more robust method of getting the username, since in some cases it is not argument 5. See the man page for printcap.

## 11.7. From Windows.

Printing from a Windows (or presumably, OS/2) client to a Linux server is directly supported over SMB through the use of the SAMBA package, which also supports file sharing of your Linux filesystem to Windows clients.

Samba includes fairly complete documentation, and there is a good Samba FAQ which covers it, too. You can either configure a magic filter on the Linux box and print PostScript to it, or run around installing printer-specific drivers on all the Windows machines and having a queue for them with no filters at all. Relying on the Windows drivers may in some cases produce better output, but is a bit more of an administrative hassle if there are many Windows boxen. So try Postscript first. Modern versions of Samba should support the automagical driver download mechanism offered by Windows NT servers to deal with this problem.

With PDQ, you should configure Samba to run the pdq command with appropriate arguments instead of the lpr command that it defaults to running. I believe that Samba will run pdq as the proper user, so it should work well this way. There are several Samba options that you should adjust to do this:

printcap

This should point to a "fake" printcap you whip up listing available printers. All you need is a short and long name for each printer, one per line:
 lp1|Printer One lp2|Printer Two lp3|Printer Three
The short name will be used as the printer name for the print command:

print command

This will need to be set to something like pdq -P %p %s ; rm %s.

lprm command

There doesn't seem to be a good value for this setting at the moment. PDQ's queued jobs will expire after a time, so if the printer is totally gone there's no problem. If you just change your mind, you can use xpdq to cancel jobs, but this is inconvenient from Windows. Just put a do-nothing command like true for now. If you use lpd or LPRng as the back-end, then a suitable lprm command should work. I'm not sure how Samba would identify the lpr queue entry number for a pdq-submitted job.

lpq command

Again, PDQ doesn't offer a good value to put here. Distributed systems don't offer a sensible way to see the queue, but samba-centric centralized server systems want to have a queue worth examining. Just put a do-nothing command like true for now. If you use LPD or LPRng as the back-end, then a suitable lpq command should work; you just won't see jobs until they're done being filtered by PDQ.

## 11.8. From an Apple.

Netatalk supports printing from Apple clients over EtherTalk. See the Netatalk HOWTO Page for more information.

## 11.9. From Netware.

The ncpfs package includes a daemon named pserver which can be used to privide service to a NetWare print queue. From what I understand, this system requires a Bindery-based NetWare, ie 2.x, 3.x, or 4.x with bindery access enabled.

For more information on ncpfs and it's pserver program, see the ncpfs FTP site.

Most networked printers support some method of remote administration. Often there are easy-to-use web pages for configuration. More usefully, there is often support for SNMP management. Typically you can find out interesting information on printer status like ink and paper levels, print volumes, and so forth, and you can usually change certain settings. SNMP printer control, and a number of other printing-related things, are being standardized by the IEEE's Printer Working Group

Npadmin is a command-line program which offers an interface to the common SNMP functionality of networked printers. It implements the standard Printer MIB, as well as a few vendor-proprietary schemes used mainly for older devices. Both printer-discovery style actions and various printer status queries are supported.

npadmin has an excellent man page, and precompiled packages are distributed for a number of RPM and dpkg based distributions.

### 11.10.2. Other SNMP tools

Besides npadmin, there are a number of SNMP tools that will be useful. snmptraplogd can log SNMP trap events. This is useful for observing printer jams, out of paper events, etc; it would be straightforward to retransmit certain events to a pager, or to send an email.

While npadmin provides simplified support for many network printers' SNMP interfaces, some printers may have vendor extensions which npadmin doesn't know about. In this case, you can use the CMU SNMP tools, which support arbitrary SNMP GET and SET operations, as well as walks and the like. With these, and a bit of work, you can make use of any SNMP feature offered by your printer's MIB. You may need to obtain a MIB from your vendor to figure out what all the variables are; sometimes vendors think that people actually use the proprietary tools they ship.

VA Linux's libprinterconf includes code to perform network printer discovery. Printers are identified against a compiled-in library of printer signatures; at the moment the library is not large, but does cover many common networked printer models.

# 12. Windows-only printers

As I discussed earlier, some printers are inherently unsupported because they don't speak a normal printer language, instead using the computer's CPU to render a bitmap which is then piped to the printer at a fixed speed. In a few cases, these printers also speak something normal like PCL, but often they do not. In some (really low-end) cases, the printer doesn't even use a normal parallel connection but relies on the vendor's driver to emulate what should be hardware behaviour (most importantly flow control).

In any case, there are a few possible workarounds if you find yourself stuck with such a lemon.

## 12.1. The Ghostscript Windows redirector

There is now a Windows printer driver available (called mswinpr2) that will run a print job through Ghostscript before finally printing it. (Rather like an if filter in Unix's LPD). There is also a new Ghostscript driver which will print using Windows GDI calls. Taken all together, this allows a Windows machine to print PostScript to a Windows-only printer through the vendor's driver.

If you get that working, you can then follow the instructions above for printing to a Windows printer over the network from Linux to let Unix (and other Windows, Mac, etc) hosts print to your lemon printer.

## 12.2. HP Winprinters

Some HP printers use "Printing Performance Architecture" (marketingspeak for "we were too cheap to implement PCL"). This is supported in a roundabout way via the pbm2ppa translator written by Tim Norman. Basically, you use ghostscript to render PostScript into a bitmapped image in pbm format and then use pbm2ppa to translate this into a printer-specific ppa format bitmap ready to be dumped to the printer. This program may also come in ghostscript driver format by now.

The ppa software can be had from the ppa home page; pbm2ppa supports some models of the HP 720, 820, and 1000; read the documentation that comes with the package for more details on ppa printer support.

## 12.3. Lexmark Winprinters

Most of the cheap Lexmark inkjets use a proprietary language and are therefore Winprinters. However, Henryk Paluch has written a program which can print on a Lexmark 7000. Hopefully he'll be able to figure out color and expand support to other Lexmark inkjets. See here for more info.

Similarly, there are now drivers for the 5700, 1000, 1100, 2070, 3200, and others. See the supported printers listing above, and my web site, for more information on obtaining these drivers.

# 13. How to print to a fax machine.

You can print to a fax machine with, or without, a modem.

## 13.1. Using a faxmodem

There are a number of fax programs out there that will let you fax and receive documents. One of the most powerful is Sam Leffler's HylaFAX. It supports all sorts of things from multiple modems to broadcasting.

SuSE ships a Java HylaFax client which allegedly works on any Java platform (including Windows and Linux). There are also non-Java fax clients for most platforms; Linux can almost certainly handle your network faxing needs.

Also available, and a better choice for smaller installations, is efax, a simple program which sends and receives faxes. The getty program mgetty can receive faxes using efax (and do voicemail or interactive logins).

### 13.1.1. Faxing from PDQ

PDQ doesn't ship with a fax interface declaration, but here's a simple one (which is only partly tested):
 interface efax-0.1 { help "This interface uses the efax package's fax program to send a fax. You should first get efax's \"fax send\" working by itself by editing the file /etc/efax.rc and testing. Connect this interface to a generic postscript driver to define a fax machine \"printer\"". requires { "efax" "fax" } # Making phone number required means that the add printer wizard # will demand a phone number at add printer time. This is # undesirable, so it isn't explicitly required, even though it is # logically required. The send_exec script checks for the number. # You could skip the wizard by adding this printer by hand to # .printrc, mark this as required, and it might then prompt? argument { var = "PHONE_NUMBER" desc = "Phone Number" help = "The phone number to dial. Prefixes like 9 ought to be defined in your /etc/efax.rc file." } option { var = "RESOLUTION" desc = "Fax resolution" default_choice = "high" choice "low" { value = "-l" desc = "Low" help = "Low resolution on a fax is 96lpi." } choice "high" { value = "" desc = "High" help = "High resolution on a fax is 192lpi." } } # If you don't specify a phone number the job just fails, and # the only way to figure this out is to look at the error message # at the bottom of the job details. Hmm. send_exec { if [ "x$PHONE_NUMBER" != "x" ] then fax send$RESOLUTION $PHONE_NUMBER$INPUT else echo 'You must specify a phone number!' false fi } }

## 13.2. Using the Remote Printing Service

There is an experimental service offered that lets you send an email message containing something you'd like printed such that it will appear on a fax machine elsewhere. Nice formats like postscript are supported, so even though global coverage is spotty, this can still be a very useful service. For more information on printing via the remote printing service, see the Remote Printing WWW Site.

## 13.3. Commercial Faxing Services

A number of companies operate web-based faxing services. EFax, in particular, offers free inbound faxes (to your own dedicated fax number, no less) via email, and fax transmission for a fee. Other companies offer similar services.

# 14. How to generate something worth printing.

Here we get into a real rat's-nest of software. Basically, Linux can run many types of binaries with varying degrees of success: Linux/x86, Linux/Alpha, Linux/Sparc, Linux/foo, iBCS, Win16/Win32s (with dosemu and, someday, with Wine), Mac/68k (with Executor), and Java. I'll just discuss native Linux and common Unix software.

## 14.1. Markup languages

Most markup languages are more suitable for large or repetitive projects, where you want the computer to control the layout of the text to make things uniform.

nroff

This was one of the first Unix markup languages. Man pages are the most common examples of things formatted in *roff macros; many people swear by them, but nroff has, to me at least, a more arcane syntax than needed (see Figure 9), and probably makes a poor choice for new works. It is worth knowing, though, that you can typeset a man page directly into postscript with groff. Most man commands will do this for you with man -t foo | lpr.

Figure 9. Example of roff Input

 .B man is the system's manual pager. Each .I page argument given to .B man is normally the name of a program, utility or function. The .I manual page associated with each of these arguments is then found and displayed. A .IR section , if provided, will direct .B man to look only in that .I section of the manual.
TeX

TeX, and the macro package LaTeX, are one of the most widely used markup languages on Unix. Technical works are frequently written in LaTeX because it greatly simplifies the layout issues and is still one of the few text processing systems to support mathematics both completely and well. TeX's output format is dvi, and is converted to PostScript or Hewlett Packard's PCL with dvips or dvilj. If you wish to install TeX or LaTeX, install the whole teTeX group of packages; it contains everything. Recent TeX installations include pdfTeX and pdfLaTeX, which produce Adobe PDF files directly. Commands are available do create hyperlinks and navigation features in the PDF file.

Figure 10. Example of LaTeX Input

 \subsubsection{NAT} Each real server is assigned a different IP address, and the NA implements address translation for all inbound and outbound packets. \begin{description} \item[Advantage] Implementation simplicity, especially if we already implement other NAT capabilities. \item[Disadvantage] Return traffic from the server goes through address translation, which may incur a speed penalty. This probably isn't too bad if we design for it from the beginning. \item[Disadvantage] NAT breaks the end-to-end semantics of normal internet traffic. Protocols like ftp, H.323, etc would require special support involving snooping and in-stream rewriting, or complete protocol proxying; neither is likely to be practical. \end{description}
SGML

There is at least one free SGML parser available for Unix and Linux; it forms the basis of Linuxdoc-SGML's homegrown document system. It can support other DTD's, as well, most notably DocBook. This document is written in DocBook-DTD SGML; see Figure 11 for an example.

Figure 11. Example of DocBook SGML

  SGML There is at least one free SGML parser available for Unix and Linux; it forms the basis of Linuxdoc-SGML's homegrown document system. It can support other DTD's, as well, most notably DocBook. This document is written in DocBook-DTD SGML. 

## 14.2. WYSIWYG Word Processors

There is no shortage of WYSIWYG word processing software. Several complete office suites are available, including one that's free for personal use (StarOffice).

StarOffice

Sun Microsystems is distributing StarOffice on the net free for Linux. This full-blown office suite has all the features you'd expect, including both import and export of Microsoft Office file formats (including Word documents). There's a mini-HOWTO out there which describes how to obtain and install it. It generates PostScript, so should work with most any printer that works otherwise on Linux.

WordPerfect

Corel distributes a basic version of WordPerfect 8 free for Linux, and sells various packages of Word Perfect Office 2000 (which includes WordPerfect, Corel Draw and Quattro Pro Versions 9). The Linux WordPerfect Fonts and Printers page has information about configuring WordPerfect for use with either Ghostscript or its built-in printer drivers (which are apparently identical the DOS WordPerfect drivers, if your printer's driver isn't included in the distribution).

Applix

Applix is a cross-platform (ie, various Unices, Windows, and others) office suite sold by the Applix company. Red Hat and SuSE sold it themselves when it was the only game in town; now sales have reverted to Applix. This is the only native Unix-style application suite; it probably fits in better with the Unix way of doign things.

AbiWord

AbiWord is one of several GPL WYSIWYG word processor projects; this one has produced a very nice word processor based on an XML format. It is capable of Word file import. AbiWord is still a work in progress, although it is useful for small things now.

Figure 12. AbiWord

LyX

LyX is a front-end to LaTeX which looks very promising. See the LyX Homepage for more information. There is a KDE-styled version of LyX, called Klyx; the author of LyX and the instigator of KDE are the same person.

Figure 13. LyX

Maxwell

Maxwell is a simple MS RTF-format based word processor which started as a commercial product but is now distributed under the GPL.

Other vendors should feel free to drop me a line with your offerings.

# 15. Printing Photographs

There are many details to getting decent photo output from common printers. If you haven't bought a photo printer yet, see the photo-related tips in Section 5.4.

## 15.1. Ghostscript and Photos

Ghostscript has some difficulties rendering color photographs through most drivers. The problems are several:

• Many drivers have poorly tuned color support. Often the colors don't match the Windows driver output or the screen. OTOH, all drivers, and Ghostscript as a whole, have readily adjustable color support; the "Gamma" settings (see Section 10.2.2) are one thing to play with, and there are others documented in Ghostscript's Use.htm documentation file.

• I'm only aware of one Ghostscript driver with support for 6 and 7 color printing; it's in beta at the moment and supports most Epson Stylus Photo models. It is rumoured to produce better color than the Windows driver (!). The Ghostscript driver core itself provides no support for non CMYK or RGB colors; arguably, some work to put that there is needed.

• Ghostscript often ends up dithering coarsely, or generating printouts with artifacts like banding. The dithering can usually be corrected; see Section 10.2.3, and read the documentation for your driver.

You should be able to correct some of these problems by tuning Ghostscript; see Section 10 for more information on how to do this. Fiddling with Ghostscript options is much easier if you declare them as options in your spooling system.

That said, the obvious solution for now is to use non-Ghostscript software for printing photos, and indeed, such things do exist. The main contender is the print plugin in the Gimp, which supports pixel-for-pixel printing on Epson Styluses and Postscript printers (with basic PPD support). That Epson Stylus portion of that driver is available for Ghostcript, as well, as the stp driver. Also possible to use for this purpose are the assorted external pnm-to-foo programs used to print on printers like the cheap Lexmarks; these print attempt to print pixmaps pixel-for-pixel.

The best solution, of course, is to buy a Postscript printer; such printers can usually be completely controlled from available free software, and will print to the full capability of the printer.

## 15.2. Paper

Color inkjets are extremely dependent on the paper for good output. The expensive glossy coated inkjet papers will allow you to produce near-photographic output, while plain uncoated paper will often produce muddy colors and fuzzy details. Nonglossy coated inkjet papers will produce results in between, and are probably best for final prints of text, as well. Stiffer glossy coated "photo" papers will produce similar output to lighter-weight glossy papers, but will feel like a regular photo.

## 15.3. Printer Settings

For photo output on most color inkjets, you should use the most highly interlaced (and slowest) print mode; otherwise solid regions may have banding or weak colors. Generally with Ghostscript this is what will happen when you pick the highest resolution. With Postscript printers, you may need to add a snippet to the prologue based on the settings available in the PPD file. The Gimp's PPD support doesn't include (printer-specific) print quality settings, but I added one in an ugly way for my own use; contact me if you'd like that. If you use PDQ or CUPS, you can easily control all the printer settings you need. VA Linux's libppd and the GPR front-end can also add these options for Postscript printers.

## 15.4. Print Durability

Color inkjet printouts usually fade after a few years, especially if exposed to lots of light and air; this is a function of the ink. Printers with ink-only consumables like the Epsons and Canons can buy archival inks, which are less prone to this problem. Newer printers often use pigment-based inks, which don't fade as much as the older dye-based ink did. No inkjet output is really particularly good for long-term archival use. Write the bits to a CD-R and store that instead.

## 15.5. Shareware and Commercial Software

There's a program called xwtools which supports photo printing with all the bells and whistles on an assortment of Epson, HP, and Canon printers. Unfortunately, it was written under NDA, so comes without source. Unless you use it for the Epson Stylus Color 300 on Linux x86, it costs E15 for personal use; commercial pricing is unknown.

The ESP Print Pro package from Easy Software supports some printers which might otherwise be unsupported. These drivers are not reported to be very well-tuned for photos, but they do work.

# 16. On-screen previewing of printable things.

Nearly anything you can print can be viewed on the screen, too.

## 16.1. PostScript

Ghostscript has an X11 driver best used under the management of the PostScript previewer gv. The latest versions of these programs should be able to view PDF files, as well. Note that gv has replaced the older previewer "Ghostview"; the new user interface is mch prettier and featureful that ghostview's plain old Athena GUI.

Figure 14. Gv

## 16.2. TeX dvi

TeX DeVice Independent files may be previewed under X11 with xdvi. Modern versions of xdvi call ghostscript to render PostScript specials.

A VT100 driver exists as well. It's called dgvt. Tmview works with Linux and svgalib, if that's all you can do.

You can also use xpdf, which is free software, and I believe gv supports viewing PDF files with gs under X11.

# 17. Serial printers under lpd

Serial printers are rather tricky under lpd.

## 17.1. Setting up in printcap

Lpd provides five attributes which you can set in /etc/printcap to control all the settings of the serial port a printer is on. Read the printcap man page and note the meanings of br#, fc#, xc#, fs# and xs#. The last four of these attributes are bitmaps indicating the settings for use the port. The br# atrribute is simply the baud rate, ie br#9600'.

It is very easy to translate from stty settings to printcap flag settings. If you need to, see the man page for stty now.

Use stty to set up the printer port so that you can cat a file to it and have it print correctly. Here's what stty -a' looks like for my printer port:
 dina:/usr/users/andy/work/lpd/lpd# stty -a < /dev/ttyS2 speed 9600 baud; rows 0; columns 0; line = 0; intr = ^C; quit = ^\; erase = ^?; kill = ^U; eof = ^D; eol = ; eol2 = ; start = ^Q; stop = ^S; susp = ^Z; rprnt = ^R; werase = ^W; lnext = ^V; min = 1; time = 0; -parenb -parodd cs8 hupcl -cstopb cread -clocal -crtscts -ignbrk -brkint -ignpar -parmrk -inpck -istrip -inlcr -igncr -icrnl ixon -ixoff -iuclc -ixany -imaxbel -opost -olcuc -ocrnl -onlcr -onocr -onlret -ofill -ofdel nl0 cr0 tab0 bs0 vt0 ff0 -isig -icanon -iexten -echo -echoe -echok -echonl -noflsh -xcase -tostop -echoprt -echoctl -echoke
The only changes between this and the way the port is initialized at bootup are -clocal, -crtscts, and ixon. Your port may well be different depending on how your printer does flow control.

You actually use stty in a somewhat odd way. Since stty operates on the terminal connected to it's standard input, you use it to manipulate a given serial port by using the <' character as above.

Once you have your stty settings right, so that cat file > /dev/ttyS2' (in my case) sends the file to the printer, look at the file /usr/src/linux/include/asm-i386/termbits.h. This contains a lot of #defines and a few structs (You may wish to cat this file to the printer (you do have that working, right?) and use it as scratch paper). Go to the section that starts out

 /* c_cflag bit meaning */ #define CBAUD 0000017
This section lists the meaning of the fc# and fs# bits. You will notice that the names there (after the baud rates) match up with one of the lines of stty output. Didn't I say this was going to be easy?

Note which of those settings are preceded with a - in your stty output. Sum up all those numbers (they are octal). This represents the bits you want to clear, so the result is your fc# capability. Of course, remember that you will be setting bits directly after you clear, so you can just use fc#0177777' (I do).

Now do the same for those settings (listed in this section) which do not have a - before them in your stty output. In my example the important ones are CS8 (0000060), HUPCL (0002000), and CREAD (0000200). Also note the flags for your baud rate (mine is 0000015). Add those all up, and in my example you get 0002275. This goes in your fs# capability (fs#02275' works fine in my example).

Do the same with set and clear for the next section of the include file, "c_lflag bits". In my case I didn't have to set anything, so I just use xc#0157777' and `xs#0'.

## 17.2. Older serial printers that drop characters

Jon Luckey points out that some older serial printers with ten-cent serial interfaces and small buffers really mean stop when they say so with flow control. He found that disabling the FIFO in his Linux box's 16550 serial port with setserial corrected the problem of dropped characters (you apparently just specify the uart type as an 8250 to do this).

# 18. What's missing?

Many of the parts for a complete printing system do not exist yet. Projects are underway to address most of these, although most have not yet produced running useful code, and efforts to standardize the necessary protocols and APIs are in their infancy.

## 18.1. Plumbing

There's a general problem with getting all the parts to talk to one another; especially in a spooler-independent way. This problem manifests itself most noticably in the pathetic application support for control over all the "usual" printing features. There is simply no way for an application writer to get information about printers, jobs, etc; no standardized way to submit jobs; no good way to get job status back; nor even really a standardized way to generate print data (although most of the new desktop systems offer desktop-specific facilities for doing this).

Work to define a sensible API for applications to use for printing will undoubtedly center around Corel's sysAPS library, which provides a rudimentary implementation of several queueing and printer information features.

## 18.2. Fonts

Font handling on free systems is rather awkward. The display, the printer, the application, and the data files should ideally all have access to the same fonts. Unfortunately this is simply not the case. Plans are afoot to remove font handling from the X server, simplifying part of the problem, but good printer font to application font mapping is still a problem. No project really seems to be underway to address this; currently application writers simply embed their own fonts into printed data.

Applications or spoolers need to learn about printer and driver properties somehow. The current standardized scheme, implemented on Windows, the Mac, and in CUPS, is to use Postscript Printer Description files to drive a programatic interface and user interface. This had trouble for non-Postscript printers, for obvious reasons, so the IEEE's Printer Working Group has a project to specify "Universal Printer Driver Format", or UPDF, files. Thus far they have constructed a sample file in an XML format. The sample file strongly resembles a PPD file, and is missing all sorts of driver and platform specific information; so much so that UPDF is currently not useful. IBM has a fully parameterized driver architecture for OS/2 which is available as free software; once this is released it is bound to be a useful source of ideas or code, and possibly a good enough system to just use outright. Even this system, however, provides no defined mechanism for communicating interesting properties from the driver space up to the application. Some XML format, and/or an API for fetching assorted properties, is bound to appear at some point.

## 18.4. Drivers

The state of free software drivers is rather poor. Fortunately, several projects are underway to correct this, and impressive results can now be had on printers using that code. The eventual goal seems to be to provide both good drivers and a good framework for the frequently duplicated (and hard!) parts of driver code—dithering, for example—to be shared.

Printer vendor cooperation will be an important part of achieving this goal. Vendors currently do not provide the minimum documentation necessary to operate their devices well. At the Printing Summit 2000, many vendors were present, and some small headway was made on this point. Vendors are mainly concerned with keeping the dithering and related algorithms secret; these software components are what produces such remarkable inkjet output, and the vendors are of course competing. Those vendors present at the summit should now have a clearer picture of how free software works and what we want from them. This isn't much; bt it sets the stage for future progress.

# 19. Credits

Special thanks to Jacob Langford, author of pdq, who finally gave us something better than the smattering of scripts globbed onto a 20 year old overgrown line-printer control program.

The smbprint information is from an article by Marcel Roelofs <marcel@paragon.nl>.

The nprint information for using Netware printers was provided by Michael Smith <mikes@bioch.ox.ac.uk>.

The serial printers under lpd section is from Andrew Tefft <teffta@engr.dnet.ge.com>.

The blurb about gammas and such for gs was sent in by Andreas <quasi@hub-fue.franken.de>.

The two paragraphs about the 30 second closing_wait of the serial driver was contributed by Chris Johnson <cdj@netcom.com>.

Robert Hart sent a few excellent paragraphs about setting up a print server to networked HPs which I used verbatim.

And special thanks to the dozens upon dozens of you who've pointed out typos, bad urls, and errors in the document over the years.

# A

accounting, Accounting
Apple
netatalk
See netatalk
printing from, From an Apple.
printing to, Printing to an EtherTalk (Apple) printer
AppSocket protocol, To AppSocket Devices
APS Filter, Basic LPD configuration
SuSE, SuSE
archiving
print durability, Print Durability

# C

Caldera, Caldera
configuration
LPD, Configuring LPD
PDQ, Configuring PDQ
Corel, Corel
CUPS, CUPS
XPP
See XPP

# D

Debian, Debian
Corel, Corel
drivers
port
printer, Printer compatibility list

# E

environment
enterprise, Large Installations, Printing to a networked printer
home, CUPS, Using a faxmodem

# F

filtering, How it all works
LPD, Basic LPD configuration
PDQ, Language Filtering
filters
APS Filter, Basic LPD configuration, SuSE
lpdomatic, Basic LPD configuration
rhs-printfilters, Basic LPD configuration, Red Hat

# G

Ghostscript, Ghostscript.
accounting, Accounting
photographs, Ghostscript and Photos
tuning, Ghostscript output tuning

# H

HP
JetDirect, To AppSocket Devices

# I

if, Basic LPD configuration
Internet Printing Protocol
See IPP
IPP, CUPS

# L

lpc, LPD
LPD, LPD
accounting, Accounting
AppSocket protocol, To AppSocket Devices
APS Filter, Basic LPD configuration
configuration, Configuring LPD
filters, Basic LPD configuration
if, Basic LPD configuration, Running an if for remote printers with old LPDs
lpc, LPD
lpdomatic, Basic LPD configuration
lpq, LPD
lpr, LPD
lprm, LPD
Netware networks, From LPD
network printers, Printing to a networked printer
permissions, File Permissions
PostScript, LPD for PostScript Printers
rhs-printfilters, Basic LPD configuration
Unix networks, Printing to a Unix/lpd host
VA Linux's version, LPD, LPD for PostScript Printers
Windows networks, From LPD
lpdomatic, Basic LPD configuration
lpq, LPD
lpr, LPD
usage, With LPD and the lpr command
lprm, LPD
LPRng, LPRng
accounting, Accounting
AppSocket protocol, To AppSocket Devices
Caldera, Caldera

# M

Mandrake, Mandrake

# N

ncpfs, From Netware.
netatalk, From an Apple.
Netware
ncpfs
See ncpfs
printing from, From Netware.
printing to, Printing to a NetWare Printer
networks, Networks
Apple, Printing to an EtherTalk (Apple) printer, From an Apple.
AppSocket protocol, To AppSocket Devices
large, Large Installations
LPD, Printing to a Unix/lpd host
Netware, Printing to a NetWare Printer, From Netware.
network printers, Printing to a networked printer
PDQ, With pdq
print servers, Large Installations, Printing to a networked printer
rlpr, With rlpr
Unix, Printing to a Unix/lpd host
Windows, Printing to a Windows or Samba printer, From Windows.
uses, Large Installations, Accounting

# P

paper
quality, Paper
PDF, Postscript
PDQ, PDQ
Apple networks, From PDQ
appletalk, Drivers and Interfaces
AppSocket protocol, To AppSocket Devices
configuration, Configuring PDQ
creating drivers, Creating a PDQ Driver Declaration
filtering, Language Filtering
finding drivers, Creating a PDQ Driver Declaration
from Windows, From Windows.
Netware networks, Printing to a NetWare Printer
network printers, Printing to a networked printer
overview, PDQ
Unix networks, With pdq
usage, With PDQ
Windows networks, From PDQ
photograph
color, Color Printing in Ghostscript
commercial software, Shareware and Commercial Software
gamma, Gamma, dotsizes, etc.
Ghostscript, Ghostscript and Photos
printers, How to buy a printer
tips, Printing Photographs
ports, Kernel printer devices
parallel, The lp device (kernels <=2.1.32), The parport device (kernels >= 2.1.33)
serial, Serial devices, Serial printers under lpd
USB, USB Devices
Postscript, Postscript
LPD, LPD for PostScript Printers
previewing, PostScript
printers, Postscript, LPD for PostScript Printers
PPR, PPR
previewing, On-screen previewing of printable things.
Postscript, PostScript
printers
photograph, How to buy a printer

# R

Red Hat, Red Hat
rhs-printfilters, Basic LPD configuration
rlpr, With rlpr

# S

samba, From Windows.
spoolers, How it all works
CUPS, CUPS
LPRng, LPRng
PDQ, PDQ
PPR, PPR
SuSE, SuSE

# V

VA Linux
LPD, LPD, LPD for PostScript Printers

# W

Windows
printing from, From Windows.
printing to, Printing to a Windows or Samba printer
samba
See samba
winprinters, Supported Printers
workarounds, Windows-only printers

xpdq, PDQ