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Resource cupsorg pwgorg/ipp sourceforgenet/projects/lprng TABLE 26-1 Print Resources
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Description Common Unix Printing System Internet Printing Protocol LPRng print server
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Once you have installed your printers and configured your print server, you can print and manage your print queue using print clients There are a variety of printer clients available for the CUPS server, GNOME print manager, the CUPS configuration tool, and various line printing tools like lpq and lpc These are described in further detail later in this chapter The CUPS configuration tool is a web-based configuration tool that can also manage printers and print jobs (open your browser and enter the URL http://localhost:631) A web page is displayed with entries for managing jobs, managing printers, and administrative tasks Select the Manage Jobs entry to remove or reorder jobs you have submitted
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NOTE Line Printer, Next Generation (LPRng) was the traditional print server for Linux and Unix
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systems, but it has since been dropped from many Linux distributions You can find out more about LPRng at sourceforgenet/projects/lprng
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Before you can use any printer, you first have to install it on a Linux system on your network A local printer is installed directly on your own system This involves creating an entry for the printer in a printer configuration file that defines the kind of printer it is, along with other features such as the device file and spool directory it uses On CUPS, the printer configuration file is /etc/cups/printersconf Installing a printer is fairly simple: determine which device file to use for the printer and the configuration entries for it
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TIP If you cannot find the drivers for your printer, you may be able to download them from
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the OpenPrinting database at linux-foundationorg/en/OpenPrinting The site maintains an extensive listing of drivers
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Printer Device Files
Linux dynamically creates the device names for printers that are installed For parallel printers, the device names will be lp0, lp1, and lp2, depending on how many parallel printers are connected The number used in these names corresponds to a parallel port on your PC; lp0 references the LPT1 parallel port and lp1 references the LPT2 parallel port Serial printers will use serial ports, referenced by device files like ttyS0, ttyS1, ttyS2, and so on USB-connected printers will have a Hardware Abstract Layer (HAL) device connection HAL is designed for removable devices that can easily be attached to other connections and still be recognized
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Print, News, Search, and Database Servers
Spool Directories
When your system prints a file, it makes use of special directories called spool directories A print job is a file to be printed When you send a file to a printer, a copy of it is made and placed in a spool directory set up for that printer The location of the spool directory is obtained from the printer s entry in its configuration file On Linux, the spool directory is located at /var/spool/cups under a directory with the name of the printer For example, the spool directory for the myepson printer would be located at /var/spool/cups/myepson The spool directory contains several files for managing print jobs Some files use the name of the printer as their extension For example, the myepson printer has the files controlmyepson, which provides printer queue control, and activemyepson for the active print job, as well as logmyepson, which is the log file
Installing Printers with CUPS
There are several tools available for installing CUPS printers The easiest method is to use the GNOME CUPS tools These are usually provided as part of the printer configuration tools included with most distributions They can be run easily from the GNOME desktop Alternatively you can use the CUPS web browser based configuration tools, included with the CUPS software Finally you can just edit the CUPS printer configuration files directly
Configuring CUPS on GNOME
GNOME provides support for adding and configuring CUPS printers The gnome-cupsadd tool will detect connected printers and find the model You can also add network printers, as well as manually configure a printer specifying a particular port USB printers are normally detected automatically, whereas older parallel and serial printers are manually configured To later change a printer configuration or specify printer options like paper size, right-click on its icon and select Properties The Paper and Advanced panels let you set printing specifications, whereas the Driver and Connection panels change your printer configuration
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