Line printer spooler manual

Usually it is enough to get a super-user to type the follow- ing to restart lpd. Another possibility is that the lpr program is not set-user-id to root, set-group-id to group daemon. This is normally done by the system manager when a printer is going to be down for a long time. The printer can be turned back on by a super-user with lpc. The printer device could not be opened by the daemon. This can happen for several reasons, the most common is that the printer is turned off-line.

This message can also be generated if the printer is out of paper, the paper is jammed, etc. The actual reason is dependent on the meaning of error codes returned by system device driver. Not all printers supply enough information to distinguish when a printer is off-line or having trouble e. Another possible cause of this message is some other process, such as an output filter, has an exclusive open on the device. Your only recourse here is to kill off the offending program s and restart the printer with lpc.

If the daemon is hung, a super user can use lpc to abort the current daemon and start a new one. If the remote machine is up, lpd on the remote machine is probably dead or hung and should be restarted as mentioned for lpr.

If not, the local daemon should be aborted and started with lpc. Warning: printer is down The printer has been marked as being unavailable with lpc. This normally occurs only when the daemon has unexpectedly died. The error log file for the printer and the syslogd logs should be checked for a diagnostic from the deceased process.

If the file is large enough, there will never be enough space on the remote even after the queue on the remote is empty. The solution here is to move the spooling queue or make more free space on the remote. LPD The lpd program can log many different messages using syslogd 8. Most of these messages are about files that can not be opened and usually imply that the printcap file or the protection modes of the files are incorrect.

Files may also be inaccessible if people manually manipulate the line printer system i. In addition to messages generated by lpd, any of the filters that lpd spawns may log messages using syslogd or to the error log file the file specified in the lf entry in printcap. Open navigation menu. Close suggestions Search Search. User Settings. Skip carousel. Carousel Previous. Carousel Next. What is Scribd? Explore Ebooks. Bestsellers Editors' Picks All Ebooks.

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Epoxidation of propylene using supported titanium silicate catalysts. Jump to Page. Search inside document. Revised June 8, 1. LPR lpr: printer : unknown printer The printer was not found in the printcap database. LPQ waiting for printer to become ready offline? LPRM lprm: printer : cannot restart printer daemon This case is the same as when lpr prints that the daemon cannot be started.

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. If the daemon should be killed or die unexpectedly, the lock file need not be removed.

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. Ralph Campbell , 4. This restriction was removed because it does not provide additional security and also because many modern clients connect using an unprivileged port.

The options are as follows: -b bind-address Normally, if the -s option is not specified, lpd will listen on all network interfaces for incoming TCP connections. Multiple -b options are permitted, allowing a list of addresses to be specified. Use of this option silently overrides the -s option if it is also present on the command line. See setsockopt 2 for more details. This can be useful for debugging purposes. The default is Traditionally, lpd would not use the output filter for remote printers.

This is valuable when the machine on which lpd runs is subject to attack over the network and it is desired that the machine be protected from attempts to remotely fill spools and similar attacks.

What is Print Spooler? It is a small application that manages paper print jobs sent from the computer to the printer or print server. It can store multiple print jobs in the print queue or buffer retrieved by the printer or print server. Sometimes, the printer cannot immediately process all the information about what you are printing because it is not fast enough and has low storage space.

Therefore, the printer needs a program to decide in which order the documents should be printed depending on who clicked print first , and then slowly pass the list of documents to be printed instead of sending all the documents at once.

If you use the Windows operating system, a background processing program will be built into the device. It is used with your printer to order print jobs. Spooler means you don't have to wait for one job to finish before you can load another job.

That is Print Spooler.