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Currently, there are two printer servers available for use on Red Hat Linux, the Line Printer, Next Generation (LPRng) and the Common Unix Printing System (CUPS). LPRng was the traditional print server for Linux and Unix systems, but has since been deprecated by Red Hat and will be dropped from their distribution in later versions. It is described briefly here. With Red Hat 9, CUPS is now the primary print server for Red Hat Linux and is supported by redhat-config-printer. However, in Red Hat 8.0, LPRng is still used as the default and LPRng is the server supported by redhat-config-printer. You can easily switch from one system to the other with the redhat-switch-printer tool. A dialog box displays entries for either LPRng or CUPS. You then have to use redhat-config-services (Services), accessible in the Server Settings window and menu, to start your selected print server. The print server for CUPS is cups and for LPRng it is lpd. Select the server, and then select Actions | Restart.
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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, redhat-config-printer, 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. There are a variety of printer clients available for the LPRng server, including Klpq and various line printing tools like lpq and lpc that work much like their CUPS counterparts.
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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. Installing a printer is fairly simple: determine which device file to use for the printer and the configuration entries for it. On Red Hat, you can use the redhat-config-printer configuration tool to enable you to set up and configure your printer easily. Depending on the interface you are using, redhat-config-printer will invoke either redhat-configprinter-gui, a GUI Gnome printer configuration tool, or redhat-config-printer-tui, the same tool with a screen-based cursor driven interface.
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TIP If you cannot find the drivers for your printer, you may be able to download them from www.linuxprinting .org. The site maintains an extensive listing of drivers.
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Linux creates three device names for parallel printers automatically during installation: lp0, lp1, and lp2. (Most systems currently use lp1.) The number used in these names corresponds to a parallel port on your PC. lp0 references the LPT1 parallel port, lp1 references the LPT2 parallel port, and lp2 references LPT3. Serial printers use the serial ports, referenced by the device files ttyS0, ttyS1, ttyS2, and so on.
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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 print 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/lpd under a directory with the name of the printer. For example, the spool directory for the myepson printer would be located at /var/spool/lpd/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 control.myepson, which provides printer queue control, and active.myepson for the active print job, as well as log.myepson, which is the log file.
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