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LPD(8)			FreeBSD	System Manager's Manual			LPD(8)

NAME
     lpd -- line printer spooler daemon

SYNOPSIS
     lpd [-dl] [port#]

DESCRIPTION
     Lpd is the	line printer daemon (spool area	handler) and is	normally
     invoked at	boot time from the rc(8) file.	It makes a single pass through
     the printcap(5) file to find out about the	existing printers and prints
     any files left after a crash.  It then uses the system calls listen(2)
     and accept(2) to receive requests to print	files in the queue, transfer
     files to the spooling area, display the queue, or remove jobs from	the
     queue.  In	each case, it forks a child to handle the request so the par-
     ent can continue to listen	for more requests.

     Available options:

     -d	     Turn on SO_DEBUG on the Internet listening	socket (see
	     setsockopt(2)).

     -l	     The -l flag causes	lpd to log valid requests received from	the
	     network.  This can	be useful for debugging	purposes.

     port#   The Internet port number used to rendezvous with other processes
	     is	normally obtained with getservbyname(3)	but can	be changed
	     with the port# argument.

     Access control is provided	by two means.  First, all requests must	come
     from one of the machines listed in	the file /etc/hosts.equiv or
     /etc/hosts.lpd.  Second, if the rs	capability is specified	in the
     printcap entry for	the printer being accessed, lpr	requests will only be
     honored for those users with accounts on the machine with the printer.

     The file minfree in each spool directory contains the number of disk
     blocks to leave free so that the line printer queue won't completely fill
     the disk.	The minfree file can be	edited with your favorite text editor.

     The daemon	begins processing files	after it has successfully set the lock
     for exclusive access (described a bit later), and scans the spool direc-
     tory for files beginning with cf.	Lines in each cf file specify files to
     be	printed	or non-printing	actions	to be performed.  Each such line
     begins with a key character to specify what to do with the	remainder of
     the line.

     J	     Job Name.	String to be used for the job name on the burst	page.

     C	     Classification.  String to	be used	for the	classification line on
	     the burst page.

     L	     Literal.  The line	contains identification	info from the password
	     file and causes the banner	page to	be printed.

     T	     Title.  String to be used as the title for	pr(1).

     H	     Host Name.	 Name of the machine where lpr was invoked.

     P	     Person.  Login name of the	person who invoked lpr.	 This is used
	     to	verify ownership by lprm.

     M	     Send mail to the specified	user when the current print job	com-
	     pletes.

     f	     Formatted File.  Name of a	file to	print which is already format-
	     ted.

     l	     Like ``f''	but passes control characters and does not make	page
	     breaks.

     p	     Name of a file to print using pr(1) as a filter.

     t	     Troff File.  The file contains troff(1) output (cat phototypeset-
	     ter commands).

     n	     Ditroff File.  The	file contains device independent troff output.

     r	     DVI File.	The file contains Tex l	output DVI format from Stand-
	     ford.

     g	     Graph File.  The file contains data produced by plot(3).

     c	     Cifplot File.  The	file contains data produced by cifplot.

     v	     The file contains a raster	image.

     r	     The file contains text data with FORTRAN carriage control charac-
	     ters.

     1	     Troff Font	R. Name	of the font file to use	instead	of the
	     default.

     2	     Troff Font	I. Name	of the font file to use	instead	of the
	     default.

     3	     Troff Font	B. Name	of the font file to use	instead	of the
	     default.

     4	     Troff Font	S. Name	of the font file to use	instead	of the
	     default.

     W	     Width.  Changes the page width (in	characters) used by pr(1) and
	     the text filters.

     I	     Indent.  The number of characters to indent the output by (in
	     ASCII).

     U	     Unlink.  Name of file to remove upon completion of	printing.

     N	     File name.	 The name of the file which is being printed, or a
	     blank for the standard input (when	lpr is invoked in a pipeline).

     Z	     Locale.  String to	be used	as the locale for pr(1).

     If	a file cannot be opened, a message will	be logged via syslog(3)	using
     the LOG_LPR facility.  Lpd	will try up to 20 times	to reopen a file it
     expects to	be there, after	which it will skip the file to be printed.

     Lpd uses flock(2) to provide exclusive access to the lock file and	to
     prevent multiple daemons from becoming active simultaneously.  If the
     daemon should be killed or	die unexpectedly, the lock file	need not be
     removed.  The lock	file is	kept in	a readable ASCII form and contains two
     lines.  The first is the process id of the	daemon and the second is the
     control file name of the current job being	printed.  The second line is
     updated to	reflect	the current status of lpd for the programs lpq(1) and
     lprm(1).

FILES
     /etc/printcap	   printer description file
     /var/spool/*	   spool directories
     /var/spool/*/minfree  minimum free	space to leave
     /dev/lp*		   line	printer	devices
     /var/run/printer	   socket for local requests
     /etc/hosts.equiv	   lists machine names allowed printer access
     /etc/hosts.lpd	   lists machine names allowed printer access, but not
			   under same administrative control.

SEE ALSO
     lpq(1), lpr(1), lprm(1), setsockopt(2), syslog(3),	hosts.lpd(5),
     printcap(5), lpc(8), pac(8)

     4.2 BSD Line Printer Spooler Manual.

HISTORY
     An	lpd daemon appeared in Version 6 AT&T UNIX.

4.2 Berkeley Distribution	April 19, 1994	     4.2 Berkeley Distribution

NAME | SYNOPSIS | DESCRIPTION | FILES | SEE ALSO | HISTORY

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