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In UNIX, printers are generally not mounted. The interface to the printer is a device file. This file is a kernel extension. The device file is written to just like any other file.
Writing to the printer device file is normally done via a shell utility which takes in the information to print, opens the printer device file, and writes to the printer: i.e. lp(), lpd() and other shell built-in functions.
Applications can also write directly to the printer(s) by opening and writing to the device file.
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