|Main index||Section 8||日本語||한국인||Options|
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.
|Turn on SO_DEBUG on the Internet listening socket (see setsockopt(2)).|
By default, the
daemon will only accept connections which originate
from a reserved-port (<1024) on the remote host.
|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 kilobytes 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.|
|T||Title. String to be used as the title for pr(1).|
|H||Host Name. Name of the machine where lpr(1) was invoked.|
|P||Person. Login name of the person who invoked lpr(1). This is used to verify ownership by lprm(1).|
|M||Send mail to the specified user when the current print job completes.|
|f||Formatted File. Name of a file to print which is already formatted.|
|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 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 lpd 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 lpd 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 lpd for the programs lpq(1) and lprm(1).
|/etc/printcap||printer description file|
|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.|
4.2 BSD Line Printer Spooler Manual,
|LPD (8)||June 6, 2001|
|Main index||Section 8||日本語||한국인||Options|
|“||Like a classics radio station whose play list spans decades, Unix simultaneously exhibits its mixed and dated heritage. There's Clash-era graphics interfaces; Beatles-era two-letter command names; and systems programs (for example, ps) whose terse and obscure output was designed for slow teletypes; Bing Crosby-era command editing (# and @ are still the default line editing commands), and Scott Joplin-era core dumps.||”|
|— The Unix Haters' handbook|