The first one, void, sends the output to the trash.
Its main use is to see how many pages would have been used.
gargantua ~ $ a2ps -P void parsessh.c
[parsessh.c (C): 33 pages on 17 sheets]
[Total: 33 pages on 17 sheets] sent to the printer `void'
The second, display sends the output to Ghostview, so that
you can check the output without printing. Of course if you don't have
Ghostview, it won't work... And it is up to you to configure
another displaying application (see section 4.5 Your Printers).
The last, file saves the output into a file named after the
file you printed (e.g., saves into `foo.ps' when you print
`foo.c').
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