[OS X TeX] Duplex printing using lp from command-line?

[Johan Glimming]

Dear TeXperts,

I want to duplex print a postscript file from command-line in Mac OS X. 
The printer
is a LJ4000TN with duplex unit. I could change the printer into duplex 
mode, but this
is not a good solution since occasionally I prefer to print in single 
page mode.

Therefore, I wonder how to make "lp file.ps" change the printer to 
duplex mode...

Best Wishes,
Johan Glimming 

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