In the man pages for lpr, lp, and pr, there is no mention of double-sided printing at all. How do I print double-sided? (Assuming, of course, that my printer is capable of printing double-sided.)
It is a function of the printer itself and has nothing to do with lp/lpr etc.
The same way bold on / bold off works. A series of instructions that are embeded in the print job by the generating "application" will tell the printer to duplex or not.
lp/lpr/pr are not generating applications they are just the transport.
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