PRINTCAP(5) FreeBSD File Formats Manual PRINTCAP(5)
NAME
printcap - printer capability data base
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 Type Default Description
af str NULL name of accounting file
br num none if lp is a tty, set the baud
rate (ioctl(2) call)
cf str NULL cifplot data filter
ct num 120 TCP connection timeout in
seconds
df str NULL tex data filter (DVI format)
du num 1 UID to run daemon as
ff str `\f' string to send for a form
feed
fo bool false print a form feed when device
is opened
gf str NULL graph data filter (plot(3)
format
hl bool false print the burst header page
last
ic bool 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 num 0 maximum number of copies
which can be requested on
lpr(1), zero = unlimited
ms str NULL if lp is a tty, a
comma-separated, stty(1)-like
list describing the tty modes
mx num 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 num 200 price per foot or page in
hundredths of cents
pl num 66 page length (in lines)
pw num 132 page width (in characters)
px num 0 page width in pixels
(horizontal)
py num 0 page length in pixels
(vertical)
rc bool 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 bool false restrict remote users to
those with local accounts
rw bool false open the printer device for
reading and writing
sb bool false short banner (one line only)
sc bool false suppress multiple copies
sd str /var/spool/lpd spool directory
sf bool false suppress form feeds
sh bool 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] -wwidth -llength -iindent -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 -xwidth -ylength -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 4.2BSD.
FreeBSD 13.1-RELEASE-p6 October 11, 2000 FreeBSD 13.1-RELEASE-p6
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