.\"	$OpenBSD: printcap.5,v 1.19 2007/03/12 19:25:36 stevesk Exp $
.\"	$NetBSD: printcap.5,v 1.7 1998/02/20 12:24:50 hubertf Exp $
.\"
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.\"     @(#)printcap.5	8.2 (Berkeley) 12/11/93
.\"
.Dd December 11, 1993
.Dt PRINTCAP 5
.Os
.Sh NAME
.Nm printcap
.Nd printer capability database
.Sh SYNOPSIS
.Nm printcap
.Sh DESCRIPTION
The
.Nm
file is a simplified version of the
.Xr termcap 5
database used to describe line printers.
The spooling system accesses the
.Nm
file every time it is used, allowing dynamic addition and deletion of printers.
Each entry in the database is used to describe one printer.
This database may not be substituted for, as is possible for
.Xr termcap 5 ,
because it may allow accounting to be bypassed.
.Pp
The default printer is normally
.Dq lp ,
though the environment variable
.Ev PRINTER
may be used to override this.
Each spooling utility supports an option,
.Fl P Ns Ar printer ,
to allow explicit naming of a destination printer.
.Pp
Refer to the
.%T "4.3 BSD Line Printer Spooler Manual"
for a complete discussion on how to set up the database for a given printer.
.Sh CAPABILITIES
Refer to
.Xr termcap 5
for a description of the file layout.
.Bl -column "xx" "xx" "/var/spool/"
.Sy Name	Type	Default	Description
.It "af	str" Ta Dv NULL Ta No "name of accounting file"
.It "br	num	none	if lp is a tty, set baud rate"
.Pf ( Xr ioctl 2
call)
.It "cf	str" Ta Dv NULL Ta No "cifplot data filter"
.It "df	str" Ta Dv NULL Ta No "tex data filter"
.Pf ( Tn DVI
format)
.It "fc	num	0	if lp is a tty, clear flag bits"
.Pq Aq Pa sgtty.h
.It "ff	str" Ta So Li \ef Sc Ta No "string to send for a form feed"
.It "fo	bool	false	print a form feed when device is opened"
.It "fs	num	0	if lp is a tty, set flag bits"
.Pq Aq Pa sgtty.h
.It "gf	str" Ta Dv NULL Ta No "graph data filter"
.Pf ( Xr plot 3
format)
.It "hl	bool	false	print the burst header page last"
.It "ic	bool	false	supports non-standard ioctl to indent printout"
.It "if	str" Ta Dv NULL Ta No "name of text filter which does accounting"
.It "lf	str" Ta Pa /dev/console Ta No "error logging file name"
.It "lo	str" Ta Pa lock Ta No "name of lock file"
.It "lp	str" Ta Pa /dev/lp Ta No "local printer device, or port@host for remote"
.It "mc	num	0	maximum number of copies allowed; 0=unlimited"
.It "ms	str" Ta Dv NULL Ta No "list of terminal modes to set or clear"
.It "mx	num	0	max file size (in"
.Dv BUFSIZ
blocks); 0=unlimited
.It "nd	str" Ta Dv NULL Ta No "next directory for queues list (unimplemented)"
.It "nf	str" Ta Dv NULL Ta No "ditroff data filter (device independent troff)"
.It "of	str" Ta Dv NULL Ta No "name of output filtering program"
.It "pc	num	200	price per foot or page in hundredths of cents"
.It "pl	num	66	page length (in lines)"
.It "pw	num	132	page width (in characters)"
.It "px	num	0	page width in pixels (horizontal)"
.It "py	num	0	page length in pixels (vertical)"
.It "rf	str" Ta Dv NULL Ta No "filter for printing"
.Tn FORTRAN
style text files
.It "rg	str" Ta Dv NULL Ta No "restricted group-only group members can access"
.It "rm	str" Ta Dv NULL Ta No "machine name for remote printer"
.It "rp	str	``lp''	remote printer name argument"
.It "rs	bool	false	remote users must have a local account"
.It "rw	bool	false	open printer device for reading and writing"
.It "sb	bool	false	short banner (one line only)"
.It "sc	bool	false	suppress multiple copies"
.It "sd	str" Ta Pa /var/spool/output Ta No "spool directory"
.It "sf	bool	false	suppress form feeds"
.It "sh	bool	false	suppress printing of burst page header"
.It "st	str" Ta Pa status Ta No "status file name"
.It "tf	str" Ta Dv NULL Ta No "troff data filter (cat phototypesetter)"
.It "tr	str" Ta Dv NULL Ta No "trailer string to print when queue empties"
.It "vf	str" Ta Dv NULL Ta No "raster image filter"
.It "xc	num	0	if lp is a tty, clear local mode bits"
.Pq Xr tty 4
.It "xs	num	0	if lp is a tty, set local mode bits"
.Pq Xr tty 4
.El
.Pp
If the local line printer driver supports indentation, the daemon
must understand how to invoke it.
.Sh FILTERS
If a printer is specified via
.Sy lp
(either local or remote),
the
.Xr lpd 8
daemon creates a pipeline of
.Dq filters
to process files for various printer types.
The pipeline is not set up for remote printers specified via
.Sy rm
unless the local host is the same as the remote printer host given.
The filters selected depend on the flags passed to
.Xr lpr 1 .
The pipeline set up is:
.Bd -literal -offset indent
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
.Ed
.Pp
The
.Sy if
filter is invoked with arguments:
.Bd -filled -offset indent
.Sy if
.Op Fl c
.Fl w Ns Ar width
.Fl l Ns Ar length
.Fl i Ns Ar indent
.Fl n Ar login
.Fl h Ar host acct-file
.Ed
.Pp
The
.Fl c
flag is passed only if the
.Fl l
flag (pass control characters literally) is specified to
.Xr lpr 1 .
.Ar width
and
.Ar length
specify the page width and length
(from
.Sy pw
and
.Sy pl ,
respectively) in characters.
The
.Fl n
and
.Fl h
parameters specify the login name and host name of the owner
of the job, respectively.
The
.Ar acct-file
function is passed from the
.Sy af
.Nm
entry.
.Pp
If no
.Sy if
is specified,
.Sy of
is used instead, with the distinction that
.Sy of
is opened only once, while
.Sy if
is opened for every individual job.
Thus,
.Sy if
is better suited to performing accounting.
The
.Sy of
is only given the
.Ar width
and
.Ar length
flags.
.Pp
All other filters are called as:
.Bd -filled -offset indent
.Nm filter
.Fl x Ns Ar width
.Fl y Ns Ar length
.Fl n Ar login
.Fl h Ar host acct-file
.Ed
.Pp
where
.Ar width
and
.Ar length
are represented in pixels, specified by the
.Sy px
and
.Sy py
entries, respectively.
All filters take
.Em stdin
as the file,
.Em stdout
as the printer,
may log either to
.Em stderr
or using
.Xr syslog 3 ,
and must not ignore
.Dv SIGINT .
.Sh LOGGING
Error messages generated by the line printer programs themselves
are logged by
.Xr syslog 3
using the
.Dv LPR
facility.
Messages printed on
.Em stderr
of one of the filters are sent to the corresponding
.Sy lf
file.
The filters may, of course, use
.Xr syslog 3
themselves.
.Pp
Error messages sent to the console have a carriage return and a line
feed appended to them, rather than just a line feed.
.Sh SEE ALSO
.Xr lpq 1 ,
.Xr lpr 1 ,
.Xr lprm 1 ,
.Xr termcap 5 ,
.Xr lpc 8 ,
.Xr lpd 8 ,
.Xr pac 8
.Rs
.%T "4.3 BSD Line Printer Spooler Manual"
.Re
.Sh HISTORY
The
.Nm
file format appeared in
.Bx 4.2 .