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Ghostscript lets you view raw PostScript and Portable Document Format (PDF) files. With
the right drivers, it can also convert them into files that non-PostScript printers can process.
The following steps describe what happens when you press Print:
1. The data you want to print is stored in the print queue.
2. The print spooler retrieves the data and sends it on to the print filter.
3. The filter then determines whether the data is already in PostScript; if not, it
converts it to PostScript.
4. The PostScript data is then sent on directly to a PostScript printer (if that??™s available),
or the filter runs Ghostscript.
5. Ghostscript, in turn, uses its driver to convert the PostScript into another standard
printer language. That data is then sent to the printer.
6. When all the converted data is in the printer, the spooler deletes the data from the
print queue.
Common Unix Printing System (CUPS)
CUPS made printing a lot easier for ordinary users. Before CUPS, printing could involve
navigating around the Internet trying to find the right drivers.


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