CUPS, the Common Unix Printing System, is a printing system used by Unix and GNU/Linux, implementing various protocols including the LPD (Line Printer Daemon) protocol, the IPP (Internet Printing Protocol) and others. It uses PPD (PostScript Printer Description) files to identify the features of a printer, maintains printer configurations, and provides access to the printer options through the command line or a browser. It also has client side filters to convert, for example, pdf to PostScript to avoid pages of raw output of pdf (for Postscript printers).
The printer information is collected into
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