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lpd (8)
>> lpd (8) ( FreeBSD man: Команды системного администрирования )
lpd (8) ( Linux man: Команды системного администрирования )
BSD mandoc
NAME
lpd
- line printer spooler daemon
SYNOPSIS
[-cdlpsW46
]
[port#
]
DESCRIPTION
The
utility
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 parent can continue to listen for more requests.
Available options:
-c
By default, if some remote host has a connection error while trying to
send a print request to
on a local host,
will only send error message to that remote host.
The
-c
flag causes
to also log all of those connection errors via
syslog(3).
-d
Turn on
SO_DEBUG
on the Internet listening socket (see
setsockopt(2)).
-l
The
-l
flag causes
to log valid requests received from the network.
This can be useful
for debugging purposes.
-p
The
-p
flag is a synonym for the
-s
flag.
It is being deprecated, and may be removed in a
future version of
.
-s
The
-s
(secure) flag causes
not to open an Internet listening socket.
This means that
will not accept any connections from any remote
hosts, although it will still accept print requests
from all local users.
-W
By default, the
daemon will only accept connections which originate
from a reserved-port (<1024) on the remote host.
The
-W
flag causes
to accept connections coming from any port.
This is can be useful when you want to accept print jobs
from certain implementations of lpr written for Windows.
-4
Inet only.
-6
Inet6 only.
-46
Inet and inet6 (default).
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(5)
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 will not 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 directory
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.
Troff File.
The file contains
troff(1)
output (cat phototypesetter commands).
n
Ditroff File.
The file contains device independent troff
output.
r
DVI File.
The file contains
Tex l
output
DVI format from Stanford.
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 characters.
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(1)
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.
The
utility 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.
The
utility 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
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.
