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Ghostscript is the name of a set of software that provides:
In simple terms, this means that Ghostscript can read a PostScript or PDF file and display the results on the screen or convert them into a form you can print on a non-PostScript printer. Especially together with several popular previewers, with Ghostscript you can view or print an entire document or even isolated pages, even if your computer doesn't have Display PostScript and your printer doesn't handle PostScript itself.
In contrast, GhostView (gv) lets you view and navigate through PostScript and PDF documents on an X display by providing a user interface for the ghostscript interpreter.
The many features of GhostScript are described in the document listing command line switches and their effects.
Similarly, the GhostView features are described in the document listing command line switches and their effects.
On jacquard, ghostscript and ghostview are placed into your path using the modules facilty, and invoked thus:
% module load gs // one module for both gs and gv
% gs // to launch ghostscript
-OR-
% gv // to launch ghostview
On davinci, the module load command is unncessary.
For a quick bit of usage information, use the "-h" command line option, thus:
% gs -h