lpr options for double side print

[Ian Mortimer]

> I have a printer set up as for single-side printing. I
> do not want change  the settings. could some one show
> me hoiw to do a double-side print with lpr optiond

   lpr -o 'sides=two-sided-long-edge'
   lpr -o 'sides=two-sided-short-edge'

Normally though you'd configure your printer to do duplex by
default.  For cases where you need single sided do:

   lpr -o 'sides=one-sided'

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Ian