  The Linux Printing HOWTO
  Grant Taylor <gtaylor+pht@picante.com>
  v3.14, 23 September 1997

  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

  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 that 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 ordered such that most people will only need to read
  the first half or so.  Much of the more obscure and situation-
  dependant 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 9 or 10 is probably needed by most people.

  Since version 3.x is a complete rewrite, much 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 the answer here, you are
  encouraged to a) scan the previous version at The PHT Home Page
  <http://www.picante.com/~gtaylor/pht/> and b) drop me a note saying
  what ought to be here but isn't.

  The Printing HOWTO Home Page <http://www.picante.com/~gtaylor/pht/> is
  a good place to find the latest version; it is also, of course,
  distributed from SunSite (sunsite.unc.edu) and your friendly local LDP
  mirror.

  1.1.  History

  This is the third generation, which is to say the third complete
  rewrite, 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 thus 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 in Linuxdoc-SGML.

  1.2.  Copyright

  This document is Copyright (c) 1997 by Grant Taylor.  Please copy and
  distribute it widely, but do not modify the text or omit my name.

  2.  How to print

  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 <http://sunsite.unc.edu/LDP/HOWTO/Printing-Usage-
  HOWTO.html> covers this, and a few other queue manipulation commands
  you should probably know.

  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.  Kernel printer devices

  3.1.  The lp device

  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), 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.  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.  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 lp device's interrupt usage, polling rate,
  and other options.

  When built in to some 1.3.x and later kernels, 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 in version 2 and late-model 1.3.x kernels, 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 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 parallel port driver is in
  /usr/src/linux/drivers/char/lp.c.

  3.2.  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.

  I'll cover the parport driver more completely when I find myself using
  one, but in the meantime you can read the file
  Documentation/parport.txt in your kernel sources, or look at the
  parport web site <http://www.cyberelk.demon.co.uk/parport.html>.

  3.3.  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 <http://sunsite.unc.edu/mdw/HOWTO/Serial-
  HOWTO.html>.

  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.  Supported Printers

  The Linux kernel mostly supports any printer that you can plug into a
  serial or parallel port, but there are things to look out for, and
  printers that you won't be able to use, even though they can
  (electrically speaking) communicate with Linux.  Primary among these
  incompatible printers are those that rely on the "Windows Printing
  System".  (They're often vaguely labelled "for Windows".)  These
  printers do not work with Linux.  They haven't any "smarts" at all,
  and rely on the computer CPU to do much of the tasks that have been
  traditionally done by the printer's CPU.  Unfortunately, these tasks
  can only be done by the vendor-supplied drivers, which only run under
  Windows.  So don't buy one to use with Linux.

  As for what printers do work with Linux, the best choice is to buy a
  printer with native PostScript support.  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.

  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.  The
  Ghostscript Home Page <http://www.cs.wisc.edu/~ghost/> has a list of
  supported printers and information on the status of new and
  experimental drivers.  Please help improve the Ghostscript printer
  support page by reorting your successes and failures as it asks.

  5.  Which spooling software?

  Until recently, the choice for Linux users was simple - everyone ran
  the same old lpd lifted mostly verbatim out of BSD's Net-2 code.  Even
  today, most vendors ship this software.  But this is beginning to
  change.  SVR4-like systems including Sun's Solaris come with a
  completely different print spooling package, centered around lpsched.
  And there are signs that some Linux vendors will shift to providing
  LPRng, a far less ancient print spooling implementation that is freely
  available.  LPRng is far easier to administer for large installations
  and has a less frightfully haphazard codebase than does stock lpd.

  For the moment, even in light of the new options, lpd is probably fine
  for most Linux users.  While it isn't the snazziest system, it works
  fine once set up, and it is well understood and extensively documented
  in third-party Unix books.

  If you'd like more information on LPRng, check out LPRng - An Enhanced
  Printer Spooler
  <http://ltpwww.gsfc.nasa.gov/ltpcf/about/unix/Depotdoc/LPRng/>.
  Future versions of this HOWTO will include information on using both
  LPRng and regular lpd.

  6.  How it works, basic

  In order to get printing working well, you need to understand how the
  lpd system works.

  Lpd stands for Line Printer Daemon, and refers in different contexts
  to both the daemon and the whole collection of programs which run
  print spooling.  These are:

     lpd
        The spooling daemon.  One of these runs to control everything on
        a machine, AND one is run per printer while the printer is
        printing.

     lpr
        The user spooling command.  Lpr contacts lpd and injects a new
        print job into the spool.

     lpq
        Lists the jobs in a print queue.

     lpc
        The Lpd system control command.  With lpc you can stop, start,
        reorder, etc, the print queues.

     lprm
        lprm will remove a job from the print spool.

  So how does it fit together?  Well, when the system boots, lpd is run.
  It scans the file /etc/printcap to learn which printers it will be
  managing spools for.  Each time someone runs lpr, lpr contacts lpd
  through the named socket /dev/printer, and feeds lpd both the file to
  print and some information about who is printing and how to print it.
  Lpd then prints the file on the appropriate printer in turn.

  The lp system was originally designed when most printers were line
  printers - that is, people mostly printed plain ascii.  As it turns
  out, only a little extra scripting is needed to make lpd work quite
  well for today's print jobs, which are often in PostScript, or text,
  or dvi, or...

  7.  How to set things up, basic

  7.1.  Traditional lpd configuration

  The minimal setup for lpd rsults 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.  Nevertheless, it is the first step to
  understanding, so read on!

  Basically, 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 direc­
  tory /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(<STDIN>){chop $_; print "$_\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 illustra­
  tive.  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.  If you write a filter than can accept
  arbitrary file types as input and produce DeskJet-kosher output for
  each case, then you've got a clever print spooler indeed!

  Such a filter is called a magic filter.  Don't bother writing one
  yourself unless you print strange things - there are a good many
  written for you already on the net.

  7.2.  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.  Bummer.

  8.  Getting Printing Software

  Many prewritten filter packages (and other printer-related software)
  are available from SunSite
  <ftp://sunsite.unc.edu/pub/Linux/system/printing/>.  Such utilities as
  psutils, a2ps, mpage, dvitodvi, flpr, etc can all be found there.

  8.1.  Magicfilter

  Magic filter is one of the fully-featured filter packages out there;
  it is designed to be installed in 10 minutes.  I'm told it also
  includes special support for LPRng.

       Title:          magicfilter
       Version:        1.1b
       Entered-date:   04APR95
       Description:    A customizable, extensible automatic printer filter.
                       Lets you automatically detect and print just about any
                       data type you can find a conversion utility for.  This
                       filter is written in C and is controlled completely
                       from an external printer configuration file.
                       This version adds automagic creation of configuration
                       files based on the installed software on your system,
                       courtesy of GNU Autoconf.
                       This version is a bug fix from 1.1/1.1a; filters for
                       non-ASCII capable PostScript printers have been added.
       Author:         H. Peter Anvin <hpa@zytor.com>
       Primary-site:   sunsite.unc.edu
                       53000 /pub/Linux/system/printing/magicfilter-1.1b.tar.gz
       Copying-policy: GPL

  8.2.  APS Filter

  Another of the many magic filter packages is aps filter, by Andreas
  Klemm.  The Linux Software Map entry goes something like this:
       Begin3
       Title:          apsfilter
       Version:        4.9.1
       Entered-date:   Montag, 10. Juli 1995, 21:22:35 Uhr MET DST
       Description:    magicfilter for lpd with auto filetype detection
       Keywords:       lpd magicfilter aps apsfilter
       Original-site:  sunsite.unc.edu
                       /pub/Linux/system/printing/
                       211KB aps-491.tgz
       Platforms:      C-Compiler, gs Postscript emulator, pbmutils
       Copying-policy: GPL
       End

  APS filter installs as an if filter for a print queue, and will trans­
  late from many common file types into your printer's command set.  It
  understands, for example, text, PostScript, dvi, gif, and others.

  8.3.  EZ-Magic

  EZ-Magic is another filter package, written in bash, available on
  sunsite.

       Title:          ez-magic printer filter
       Version:        1.0.5
       Entered-date:   January 26, 1997
       Description:    ez-magic is a printer filter that supports 8 common file
                       formats (txt,ps,gif,bmp,pcx,png,jpg,tif) for printing.
                       It can print over a network (SMB), or to a local printer.
                       Reads from a file, STDIN, or lpd. Simple to use and
                       configure. Just one script file, no huge manuals and
                       multibillion drivers. The only catch is that you need a
                       few common helper programs like netpbm and ghostscript.
                       Written in bash. Easy to add formats and code. Still more
                       bugs than I have appendages, but less than the number of
                       grams of fat in a hot dog. Pre-configured for HP DeskJet
                       870Cse over network. Comparable to apsfilter and others.
       Keywords:       magic filter, print, graphics, samba, network, smb,
                       ghostscript, postscript, gif, jpg, simple
       Author:         toby@eskimo.com (Toby Reed)
       Maintained-by:  toby@eskimo.com (Toby Reed)
       Primary-site:   http://www.eskimo.com/~toby/ez-magic-1.0.5.tar.gz
                                38 kb ez-magic-1.0.5.tar.gz
       Alternate-site: sunsite.unc.edu /pub/Linux/system/printing
                                38 kb ez-magic-1.0.5.tar.gz
       Copying-policy: Copyrighted, full manipulation rights, with one or two
                       restrictions.

  9.  Vendor Solutions

  This section is, by definition, incomplete.  Feel free to send in
  details of your favourite distribution.

  9.1.  Red Hat

  Red Hat has a GUI printer administration tool 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 writes a short
  PostScript-and-ascii magic filter based around gs and nenscript.  This
  solution works fairly well, and is trivial to setup for common cases.

  9.2.  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 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 Linux
  distributions.  It is generally a year or so ahead of the free
  Ghostscript; at the moment, for example, it supports Adobe Acrobat's
  Portable Document Format, while the older Ghostscripts do not.

  The free version of Ghostscript is GNU Ghostscript, and is simply an
  aged version of Aladdin ghostscript kindly given to GNU.  (Kudos to
  Aladdin for this arrangement; more software vendors should support
  free software in this way).

  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 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 magic filter you settle
  upon, but for debugging purposes it's often handy to run it directly.

  gs -help will give a brief informative 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 gs's output is not
  satisfactory (actually, you can do anything you darn well please,
  since you have the source).

  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 you should 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.

       ---8<---- gamma.ps ----8<---
       %!
       %transfer functions for cyan magenta yellow black
       {0.3 exp} {0.3 exp} {0.3 exp} {0.3 exp} setcolortransfer
       ---8<------------------8<---

  It is also possible to mend printers that have some kind of colour
  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/ subdir), as a test page.

  11.  How to print to a printer over the network

  One of the features of lpd is that it supports printing over the
  network to printers physically connected to a different machine.  With
  the careful combination of filter scripts and assorted utilities, you
  can make lpr print transparently to printers on all sorts of networks.

  11.1.  To a Unix/lpd host

  To allow remote machines to print to your printer, 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 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:\
          :lp=/dev/null:\
          :sh:

  Note that there is still a spool directory on the local machine man­
  aged 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.

  11.1.2.  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.  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 SunSite
  <ftp://sunsite.unc.edu/pub/Linux/system/printing/>.

  11.2.  To a Win95, WinNT, LanManager, or Samba printer

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

  It is possible to direct an lpd 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:\
      :lp=/dev/null:sh:\
      :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.  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 SunSite.  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.

  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:\
               :lp=/dev/null:sh:\
               :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.  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
  <http://thehamptons.com/anders/netatalk/>.

  Obscure caveat of the week: Netatalk does not work with SMC Etherpower
  PCI Card with a DEC tulip chip.

  11.5.  To an HP or other ethernet printer

  HPs and some other printers come with an ethernet interface which you
  can print to directly using lpd.  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:\
               :lp=/dev/null:sh:\
               :sd=/var/spool/lpd/lj-5:\
               :rm=printer.name.com:rp=raw:

  HP Laserjet printers with Jet Direct 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).

  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 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.

  To do this, set up a queue on you 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 tot he 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.

  11.5.1.  To older HPs

  Some printers (and printer networking "black boxes") support only a
  cheesy little non-protocol involving plain TCP connections.  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)
  and stuff your print job into it.  This can be implemented, among
  other ways, in Perl:

  #!/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 (<IN>) {
          print S;
      }
      sleep 3;
      do dokill();
  } else {
      while(<S>) {
          print;
      }
  }

  sub dokill {
      kill 9,$child if $child;
  }

  11.6.  Running an if for remote printers

  One oddity of lpd is that the if is not run for remote printers.  If
  you find that you need to run an if, you can do so by setting up a
  double queue and requeueing the job.  As an example, consider this
  printcap:

       lj-5:remote-hplj:\
               :lp=/dev/null:sh:\
               :sd=/var/spool/lpd/lj-5:\
               :if=/usr/lib/lpd/filter-lj-5:
       lj-5-remote:lp=/dev/null: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 <options> -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.  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.

  11.8.  From an Apple.

  Netatalk supports printing from Apple clients over EtherTalk.  See the
  Netatalk HOWTO Page <http://thehamptons.com/anders/netatalk/> for more
  information.

  11.9.  From Netware.

  There is some Netware service support available for Linux from or
  because of Caldera, but I have no idea if you can offer print services
  to Netware clients.

  12.  How to print to a fax machine.

  12.1.  Using a faxmodem

  There are a number of fax programs out there that will let you fax and
  receive documents.  One of the most complex is Sam Leffler's HylaFax,
  available from ftp.sgi.com.  It supports all sorts of things from
  multiple modems to broadcasting.

  Also available, and a better choice for most Linux boxen, is efax, a
  simple program which sends faxes.  The getty program mgetty can
  receive faxes (and even do voicemail on some modems!).

  12.2.  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
  <http://www.tpc.int/>.

  13.  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, except to say that
  WordPerfect for SCO, and quite probably other commercial word
  processing software, runs fine under Linux's iBCS emulation, as does
  anything in pure Java (the Corel Office for Java Preview looked quite
  promising).

  For Linux itself, choices are mostly limited to those available for
  Unix in general:

  13.1.  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.  Trying to make a pretty sign in a markup
  language would probably hurt...

     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, 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.

     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.

     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.

     HTML
        Someone suggested that for simple projects, it may suffice to
        write it in HTML and print it out using Netscape.  I disagree,
        but YMMV.

  13.2.  WYSIWYG Word Processors

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

     StarOffice
        A German company is distributing StarOffice 3.1 (as opposed to
        the newer version 4) on the net free for Linux.  This full-blown
        office suite has all the features you'd expect, and you can't
        beat the price.  There's a mini-HOWTO out there which describes
        how to obtain and install it.  It generates PostScript or PCL,
        so should work with most any printer that works otherwise on
        Linux.

     LyX
        LyX is a front-end to LaTeX which looks very promising.  See the
        LyX Homepage <http://www-pu.informatik.uni-
        tuebingen.de/users/ettrich/> for more information.

     The Andrew User Interface System
        AUIS includes ez, a WYSIWYG-style editor with most basic word
        processor features, HTML capabilities, and full MIME email and
        newsgroup support.

     Commercial offerings
        At least Caldera and Red Hat ship packages containing the usual
        office apps like a WYSIWYGish word processor and a spreadsheet.
        I would assume they do a dandy job, but I've never used them.  I
        think Caldera also ships Sun's WABI, so you could probably run
        something like MS Office under that if you had to integrate with
        other folks' files.

        Jeff Phillips <jeff@I_RATUS.org> uses Caldera's WordPerfect for
        Linux (on Slackware, of all things) and says that it works well.
        It apparently includes built-in printer support, as one would
        expect.  Caldera should have info on  <http://www.caldera.com/>.

        RedHat ships a suite called Applixware; you can find their web
        site at  <http://www.redhat.com/>.

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

  14.  On-screen previewing of printable things.

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

  14.1.  PostScript

  Ghostscript has an X11 driver best used under the management of the
  PostScript previewer Ghostview.  The latest versions of these programs
  should be able to view PDF files, as well.

  14.2.  TeX dvi

  TeX DeVice Independant 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.

  14.3.  Adobe PDF

  Adobe's Acrobat Reader is available for Linux; just download it form
  their web site  <http://www.adobe.com/>.

  You can also use xpdf, which is freeware and comes with source, and I
  should think Ghostview supports viewing PDF files with gs under X11 by
  now.

  15.  Serial printers under lpd

  15.1.  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 = <undef>;
       eol2 = <undef>; 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 differ­
  ent 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'.

  15.2.  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).

  16.  Credits

  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
  diver was contributed by Cris 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.

