TAILIEUCHUNG - Chapter-15-Printers

In this chapter, we’ll look at some aspects of using printers with FreeBSD. As a user, you don’t access printers directly. Instead, a series of processes, collectively called the spooler, manage print data. One process, lpr, writes user print data to disk, and another, lpd, copies the print data to the printers. This method enables processes to write print data even if the printers are busy and ensures optimum printer availability. | 2 April 2003 17 00 47 The Complete FreeBSD page 263 In this chapter Printer configuration Starting the spooler Testing the spooler Troubleshooting Using the spooler PostScript PDF Printers In this chapter we ll look at some aspects of using printers with FreeBSD. As a user you don t access printers directly. Instead a series of processes collectively called the spooler manage print data. One process Ipr writes user print data to disk and another Ipd copies the print data to the printers. This method enables processes to write print data even if the printers are busy and ensures optimum printer availability. In this section we ll look briefly at what you need to do to set up printers. For more details look in the online handbook section on printing. Ipd is the central spooler process. It is responsible for a number of things It controls access to attached printers and to printers attached to other hosts on the network. It enables users to submit files to be printed. These submissions are known as jobs. It prevents multiple users from accessing a printer at the same time by maintaining a queue for each printer. It can print header pages also known as banner or burst pages so users can easily find jobs they have printed in a stack of printouts. It takes care of communications parameters for printers connected on serial ports. It can send jobs over the network to another spooler on another host. It can run special filters to format jobs to be printed for various printer languages or printer capabilities. v 2003 04 02 06 48 05 263 2 April 2003 17 00 47 The Complete FreeBSD . tools page 264 The Complete FreeBSD 264 It can account for printer usage. Through a configuration file and by providing the special filter programs you can enable the spooler to do all or some subset of the above for a great variety of printer hardware. This may sound like overkill if you are the only user on the system. It is possible to access the printer .

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