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Installing and Managing Printers: LPRng
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Printers are installed and managed on Red Hat by the Linux print server, next generation (LPRng). LPRng is an enhanced version of the Berkeley Line Printer Daemon (LPD) lpd and associated lpr applications. It features a wide range of capabilities that include security measures and access to remote printers. Many of the commands are the same as those used by LPD on a standard Unix system. The Linux printer server program is called lpd, the line printer daemon. Printers are installed to run under lpd, which then handles print jobs for them both locally and from remote sources. Though lpd is called the line printer daemon, it is designed to manage any kind of printer, not just line printers. You should think of it as a general-purpose print server capable of handling laser, inkjet, postscript, and dot-matrix printers. You can find out more information about printing in Linux at www.linuxprinting.org. LPRng also features a companion IFHP filter package which
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provides hardware-level support for postscript, PCL, text printers, among others (www.astart.com/lprng). Printers can be attached directly to your system or attached to other systems on your network. A printer attached directly to your system is referred to as a local printer. For example, a local printer would be a printer connected to your parallel port on your PC. A remote printer would be one connected directly to another system on your network. A remote printer could also be one that is designed to operate as its own host on a network, accessible directly by other systems on the network. You could even have printers connected to a single system operating just as a print server that then manages access to them. Access to both local and remote printers is managed by the lpd daemon. Request are submitted to the lpd daemon along with the print job. The lpd daemon then spools the print job, making its own copy, and then sends that job to the specified printer. The lpd daemon was installed and configured on your Linux system when you installed Red Hat. lpd is run as a stand-alone process by the lpd startup script in the /etc/rc.d/init.d directory. You can use the service command on this script to start, stop, and restart the daemon.
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service lpd restart
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lpd makes use of two configuration files: lpd.conf and lpd.perms. lpd.conf contains general lpd configuration commands. You use lpd.perms to set up rules by which you can restrict access to the lpd server. Here you can deny access by certain hosts, users, or even networks. Requests to print documents are performed by print clients like lpr. When a document is submitted for printing, it becomes a print job that is placed on a queue for the printer it was sent to. While the job is on the queue waiting to print, you can check its status and even remove it from the queue, canceling the job. The lpq client lets you check a print queue, lpc allows you to make changes to it, and lprm can be used to remove a print job from a queue.
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Installing Printers
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To use any printer, it first has to be installed on a Linux system that is on your network. A local printer is installed directly on your own system. This involves creating an entry for the printer in the /etc/printcap file that defines the kind of printer it is along with other features like the device file and spool directory it uses. Installing a printer is fairly simple: determine which device file to use for the printer, and place printer configuration entries for it in your /etc/printcap file. You can use several configuration tools to enable you to set up and configure your printer easily. Red Hat systems provide the printconf utility discussed here. KDE also provides the K Printer System utility. Red Hat 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 usually located at address 0x03bc, lp1 references the LPT2 parallel port located at 0x0378, and lp2 references LPT3 at address 0x0278. If you are unsure at what address your parallel port is located, you can use the msd.exe command on your DOS system to find it. Serial printers use the serial ports, referenced by the device files ttyS0, ttyS1, ttyS2, and so on. For a detailed
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