tail head cat sleep
QR code linking to this page

Manual Pages  — PRINTCAP

NAME

printcap – printer capability data base

CONTENTS

SYNOPSIS


printcap

DESCRIPTION

The Printcap function is a simplified version of the termcap(5) data base used to describe line printers. The spooling system accesses the printcap file every time it is used, allowing dynamic addition and deletion of printers. Each entry in the data base is used to describe one printer. This data base may not be substituted for, as is possible for termcap(5), because it may allow accounting to be bypassed.

The default printer is normally lp, though the environment variable PRINTER may be used to override this. Each spooling utility supports an option, -P printer, to allow explicit naming of a destination printer.

Refer to the 4.3 BSD Line Printer Spooler Manual for a complete discussion on how to setup the database for a given printer.

CAPABILITIES

Refer to termcap(5) for a description of the file layout. Name Ta Type Ta Default
Description

af
str NULL name of accounting file

br Ta num Ta none
if lp is a tty, set the baud rate((ioctl) 2 call)

cf
str NULL cifplot data filter

ct Ta num Ta 120
TCP connection timeout in seconds

df
str NULL tex data filter( DVI format)

du Ta num Ta 1
UID to run daemon as

ff
str '\f ' string to send for a form feed

fo Ta bool Ta false
print a form feed when device is opened

gf
str NULL graph data filter((plot) 3 format

hl Ta bool Ta false
print the burst header page last

ic Ta bool Ta false
driver supports (non standard) ioctl to indent printout

if
str NULL name of text filter which does accounting

lf
str /dev/console error logging file name

lo
str lock name of lock file

lp
str /dev/lp device name to open for output, or port@ machine to open a TCP socket

mc Ta num Ta 0
maximum number of copies which can be requested onlpr(1), zero = unlimited

ms
str NULL if lp is a tty, a comma-separated,stty(1)-like list describing the tty modes

mx Ta num Ta 0
maximum file size (in BUFSIZ blocks), zero = unlimited

nd
str NULL next directory for list of queues (unimplemented)

nf
str NULL ditroff data filter (device independent troff)

of
str NULL name of output filtering program

pc Ta num Ta 200
price per foot or page in hundredths of cents

pl Ta num Ta 66
page length (in lines)

pw Ta num Ta 132
page width (in characters)

px Ta num Ta 0
page width in pixels (horizontal)

py Ta num Ta 0
page length in pixels (vertical)

rc Ta bool Ta false
when sending to a remote host, resend copies (see below)

rf
str NULL filter for printing FORTRAN style text files

rg
str NULL restricted group. Only members of group allowed access

rm
str NULL machine name for remote printer

rp
str lp remote printer name argument

rs Ta bool Ta false
restrict remote users to those with local accounts

rw Ta bool Ta false
open the printer device for reading and writing

sb Ta bool Ta false
short banner (one line only)

sc Ta bool Ta false
suppress multiple copies

sd
str /var/spool/lpd spool directory

sf Ta bool Ta false
suppress form feeds

sh Ta bool Ta false
suppress printing of burst page header

sr
str NULL file name to hold statistics of each datafile as it is received

ss
str NULL file name to hold statistics of each datafile as it is sent

st
str status status file name

tf
str NULL troff data filter (cat phototypesetter)

tr
str NULL trailer string to print when queue empties

vf
str NULL raster image filter

Each two-letter capability has a human-readable alternate name. Short form
Long form

af
acct.file

br
tty.rate

cf
filt.cifplot

ct
remote.timeout

df
filt.dvi

du
daemon.user

ff
job.formfeed

fo
job.topofform

gf
filt.plot

hl
banner.last

if
filt.input

lf
spool.log

lo
spool.lock

lp
tty.device

mc
max.copies

ms
tty.mode

mx
max.blocks

nf
filt.ditroff

of
filt.output

pc
acct.price

pl
page.length

pw
page.width

px
page.pwidth

py
page.plength

rc
remote.resend_copies

rf
filt.fortran

rg
daemon.restrictgrp

rm
remote.host

rp
remote.queue

rs
daemon.restricted

rw
tty.rw

sb
banner.short

sc
job.no_copies

sd
spool.dir

sf
job.no_formfeed

sh
banner.disable

sr
stat.recv

ss
stat.send

st
spool.status

tf
filt.troff

tr
job.trailer

vf
filt.raster

If the local line printer driver supports indentation, the daemon must understand how to invoke it.

FILTERS

The lpd(8) daemon creates a pipeline of filters to process files for various printer types. The filters selected depend on the flags passed to lpr(1). The pipeline set up is:
p       pr | if regular text + pr(1)
none    if      regular text
c       cf      cifplot
d       df      DVI (tex)
g       gf      plot(3)
n       nf      ditroff
f       rf      Fortran
t       tf      troff
v       vf      raster image

The if filter is invoked with arguments: if [-c] -w width -l length -i indent -n login -h host acct-file

The -c flag is passed only if the -l flag (pass control characters literally) is specified to lpr(1). The Width function and length specify the page width and length (from pw and pl respectively) in characters. The -n and -h parameters specify the login name and host name of the owner of the job respectively. The Acct-file function is passed from the af printcap entry.

If no if is specified, of is used instead, with the distinction that of is opened only once, while if is opened for every individual job. Thus, if is better suited to performing accounting. The of is only given the width and length flags.

All other filters are called as: filter -x width -y length -n login -h host acct-file

where width and length are represented in pixels, specified by the px and py entries respectively.

All filters take stdin as the file, stdout as the printer, may log either to stderr or using syslog(3), and must not ignore SIGINT.

REMOTE PRINTING

When printing to a remote printer using rm, it is possible to use either if or of. If both are specified, of is ignored. Both filters behave the same except that they are passed different arguments as above. Specifically, the output filter is terminated and restarted for each file transmitted. This is necessary in order to pass the resulting size to the remote lpd(8).

If the -p flag was passed to lpr(1), pr(1) is not executed locally, but is requested of the remote lpd(8). Any input filtering via if will therefore happen before pr(1) is executed rather than afterwards.

There are some models of network printers which accept jobs from lpd(8), but they ignore the control file for a job and simply print each data file as it arrives at the printer. One side-effect of this behavior is that the printer will ignore any request for multiple copies as given with the -# flag on the lpr(1) command. The rc entry will cause lpd(8) to resend each data file for each copy that the user originally requested. Note that the rc entry should only be specified on hosts which send jobs directly to the printer.

If lp is specified as port@ machine (and rm is not in use), print data will be sent directly to the given port on the given machine.

TRANSFER STATISTICS

When a print job is transferred to a remote machine (which might be another unix box, or may be a network printer), it may be useful to keep statistics on each transfer. The sr and ss options indicate filenames that lpd should use to store such statistics. A statistics line is written for each datafile of a job as the file is successfully transferred. The format of the line is the same for both the sending and receiving side of a transfer.

Statistics on datafiles being received would be used on a print server, if you are interested in network performance between a variety of machines which are sending jobs to that print server. The print server could collect statistics on the speed of each print job as it arrived on the server.

Statistics on datafiles being sent might be used as a minimal accounting record, when you want to know who sent which jobs to a remote printer, when they were sent, and how large (in bytes) the files were. This will not give include any idea of how many pages were printed, because there is no standard way to get that information back from a remote (network) printer in this case.

LOGGING

Error messages generated by the line printer programs themselves (that is, the lpd(8) and related programs) are logged by syslog(3) using the LPR facility. Messages printed on stderr of one of the filters are sent to the corresponding lf file. The filters may, of course, use syslogd(8) themselves.

Error messages sent to the console have a carriage return and a line feed appended to them, rather than just a line feed.

SEE ALSO

lpq(1), lpr(1), lprm(1), hosts.lpd(5), termcap(5), chkprintcap(8), lpc(8), lpd(8), pac(8)

4.3 BSD Line Printer Spooler Manual,

HISTORY

The printcap file format appeared in BSD 4.2 .

PRINTCAP (5) October 11, 2000

tail head cat sleep
QR code linking to this page


Please direct any comments about this manual page service to Ben Bullock.

If you are angry with someone, you should walk a mile in their shoes - then you'll be a mile away from them, and you'll have their shoes.