Most Linux systems use PostScript as the default document format for printing. Ubuntu uses the gs command along with CUPS to manage local and remote print jobs and the type of data transferred during a print job. The gs command is used to translate the document stream into a format accepted by the destination printer (which most likely uses HPCL).
You can use the Ghostscript interpreter gs to display its built-in printer devices by using the gs interpreter with its --help command-line option, as follows:
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