Starting from a postscript file, you can use the command "psnup" to print several logical pages on one physical page. An example of this command:
 

    $psnup -pa4 -2 temp.ps temp.2.ps

 
A new version of the temp postscript file is created where two pages are printed side by side on one physical page. For further customization of psnup please look at the man pages. The  -pa4 tells the program to use A4 page format.

Source: http://www.cs.concordia.ca/help/faq/print.html#POST6

requires: psnup