HP-UX_Administering the LP Spooler

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HP-UX System Administrator's Guide: Routine Management Tasks: HP-UX 11i Version 3> Chapter 4 Managing

Printers

Administering the LP Spooler

Table of Contents Index

The following procedures are used to administer the LP Spooler:

Stopping and Restarting the LP Spooler

Controlling the Flow of Print Requests

Enabling or Disabling a Printer

Setting a Printers Fence Priority

Changing a Printers Default Request Priority

Table 4-1in Summary of Additional Printer Tasksgives further system-administration instructions for common management tasks.

Table 4-2in Solving Common Printer Problems provides troubleshooting information for potential print-management difficulties.

Table 4-3and Table 4-4list HP-UX commands that may be used to handle print requests.

Stopping and Restarting the LP Spooler

Typically, the LP spooler is started during the boot process. (To change the boot-up procedure to not start the scheduler, edit the file /etc/rc.config.d/lp and

set the shell environment variable LPto 0.)

Administering the LP Spooler http://www.kumanov.com/docstore/manuals/hp-ux/en/5992-4616/ch04s01.html

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Check for active print requests. Ideally, it is best to wait until there are no requests printing before stopping the LP spooler.

/usr/bin/lpstat -o -i

In the above command, the -ooption prints the output of all output requests; the -ioption inhibits the reporting of remote requests (that is, lpstatshows

local requests only).

Stop the LP spooler.

/usr/sbin/lpshut

All active print requests will stop, but remain in the print queue.

3.

Restart the LP spooler.

/usr/sbin/lpsched

4.

When the spooler is restarted, any print request actively being printed at the time the lpshutcommand was issued will be completely reprinted, regardless of

how much of the request was previously printed.

Controlling the Flow of Print Requests

As superuser, you can use HP SMH or HP-UX commands to control the flow of print requests to the queues of named printers or printer classes.

Using HP-UX Commands


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To allow print requests to be sent to a printer or to a printer class, use the acceptcommand. For example:

/usr/sbin/accept laser1 jet2 lj

See accept(1M)for details.

To prevent print requests from being sent to a printer or printer class, use the rejectcommand. For example:

/usr/sbin/reject lj

NOTE: If the rejectcommand is executed on a printer class, but not on members of the class, users can still specify a specific printer(not the class) in

subsequent print requests until an acceptcommand on the class is reissued.

If, however, you execute rejectfor all individual printers in a class, but not for the class itself, the print requests will remain in the class request directory until

at least one of the printers in the class is permitted to process print requests by the acceptcommand. See reject(1M) for details.

Enabling or Disabling a Printer

You can use HP SMH or the HP-UX commands enableand disableto activate or deactivate a printer for printing. You do not need superuser capabilities for

these commands.

You can issue individual enableand disablecommands for each printer or issue one command separating each printer by blank spaces. For example:

/usr/bin/enable laser1 laser2 laser3

You can enable or disable individual printers only, not printer classes. By default, any requests printing when a printer is disabled are reprinted in their entirety

when the printer is reactivated. A printer that has been disabled can still accept new print requests to be printed at a later time unless it has been prevented from

doing so by the rejectcommand.

See enable(1)anddisable(1) for details.


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Setting a Printers Fence Priority

A fence priorityis a value (0 to 7) associated with a printer and used to control access by print requests. A print request must have a value equal to or greater

than the printers fence priority or it will remain on the print queue.

You can assign the fence priority using HP SMH or HP-UX commands.

To use HP-UX commands, follow these steps:

Ensure that you have superuser capabilities.

1.

Stop the LP spooler:

/usr/sbin/lpshut

For more information, see Stopping and Restarting the LP Spooler .

2.

Set the printers fence priority (use a value from 0 to 7). For example:

/usr/sbin/lpfence myprinter 5

3.

Restart the LP spooler:

/usr/sbin/lpsched

4.


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Table 4-1summarizes additional printer tasks. Refer to the commands manpage for details. In this table, LJ-1234and LJ-1829represent sample print requests;

lj1and lj2represent printers.

Table 4-1 Additional Printing Tasks

Task Example Additional Information

Move a print request to another

location. lpalt LJ-1234 -dlj2 lj2is a destination printer or printer class. See lpalt(1).

Cancel a print request. cancel LJ-1234 LJ-1234is a unique request ID number returned by lpor lpalt. See

cancel(1), lp(1), and lpalt(1).

Change the priority of print requests. lpalt LJ-1829 -p3 This changes LJ-1829s priority to 3. See lpalt(1).

Display statistics about LP spooler

activity.

lpana To log spooler activity, start the spooler by entering lpschedwith the -a

option. Such data is useful for configuring the spooler system for optimum

operation. See lpana(1M).

List request id numbers. lpstat -o See lpstat(1).

Move all print requests from one

printer destination to another.

lpshut

lpmove lj1 lj2

lpsched

lj1and lj2are source and destination printers or printer classes. You must

issue lpshutand lpsched. See lpmove(1M) and lpsched(1M).

View the status of printers and print

requests.

lpstat For detailed status information on the spooler, print requests, and printers,

use the -toption to lpstat. See lpstat(1).


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Solving Common Printer Problems

Table 4-2summarizes printer problems and possible solutions.

Table 4-2 Printer Problems and Solutions

Problem Solution

Printer will not print. Check to see if the printer is enabled, is accepting requests, the scheduler is running, and the device file is

correct. For example, specify

lpstat -t

Make sure the printer is plugged in and turned on.

Check to see whether the printer is out of paper or has a paper jam.

If the printer supports both serial (RS232) and parallel interfaces, verify that the cable is properly connected to

the printer and the computer, and that the printer is configured for the correct interface.

If the printer is a remote printer, verify that the remote system and its spooler are running, verify that the printer

is enabled and accepting requests on both local and remote systems, verify that the remote spooler daemon is

running on the remote system. Check other entries in the procedure Adding a Remote Printer to the LP Spooler.

If LP spooler was started with logging enabled, consult/var/adm/lp/logfor possible clues about the problem.

Output being printed is not what you want. Cancel the job. For example:


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Problem Solution

cancel laserjet-1194

Printing does not resume after paper jam orpaper out.

To restart a listing from the beginning:

Take printer offline1.

Issue the disablecommand2.

Clear jam or reload paper3.

Put printer online4.

Issue the enablecommand5.

To restart a listing from the stopping point:

Take printer offline.1.

Clear jam or reload paper2.

Put printer online.3.

If printing does not resume, issue the enablecommand4.

The LP spooler configuration needs to be

restored.

Use the Save/Restore Print Configuration menu item in HP SMH.

The LP spooler will not start when using

lpsched.

Enter




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Problem Solution

rm /var/spool/lp/SCHEDLOCK

and try again (you must be superuser).

The LP spooler will not stop when using

lpshut.

Enter

kill-15 process_id

where process_idcan be found with the

ps -ef | grep lpsched

command (seeps(1)).

Typical LP Commands for Users and LP Administrators

Any user can queue files to printers, get status of the LP system, cancel any print job, and mark printers in and out of service.

The following LP commands can be issued by any user. Consult the HP-UX manpage for options and usage.

Table 4-3 LP Spooler User Commands

Command Description

lp(1) Sends a print request to a printer or plotter




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Command Description

lpstat(1) Prints information about the status of the LP spooler. Reports status of the scheduler, printers, printer classes, and default

system printer.

cancel(1) Cancels print requests of spooled files, specified by request IDs.

enable(1) Changes the status of the named printer to activate it and enable it to print spooled requests.

disable(1) Changes the status of a named printer to deactivate it and disable it from printing spooled requests.

lpalt(1) Alters a printer request; issues a new request ID.

LP administrators can change the configuration of the system, mark printers in and out of service, start and stop the system.

Table 4-4 LP Administrator Commands

Command Description

lpshut(1M) Shuts down the printer scheduler.

lpadmin(1M) Multifaceted command used to manage the LP spooler. Capabilities include adding/removing printers, changing class

members, associating a device file with a printer, assigning an interface for a printer, setting a system default destination.

accept(1M) Allow a print destination to accept requests.

reject(1M) Prevent a print destination from accepting requests.

lpsched(1M) Schedules print requests for printing to destinations; typically invoked at system startup.

lpmove(1M) Moves requests from one printer to another.

lpfence(1M) Defines the minimum priority for which a spooled file can be printed.


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HP-UX_Administering the LP Spooler