Printing two pages per sheet from the command line

Say I start off from a PDF document, say of 12 pages, viewed with **evince**. To produce another PDF of 6 sheets, with a page setup of two pages per side, I normally use the "Print to File" device listed in the ^P dialogue window. This works out pretty neatly. I would like to translate this operation for the command line. - To my understanding, this is not an operation that **pdftk** can do. Please cross check. - The command lp, which would accept the option -o number-up=2, does not recognize any device called "Print to File", which indeed does not show up in lpstat -p -d. - I am aware of the post What is “Print to File” and can it be used from command line? . I have installed **cups-pdf** whereby a new printer named PDF is acknowledged. However, the print quality of a simple text file is way too raw (for example, no print margins to start with). Moreover, if I reprint an existing PDF file on this device, say lp -p PDF existing.pdf, evince can't even manage to open that copycatted output, while this is not the case with the "Print to File" way. - I had a look at man evince. At the bottom, it touches upon a few print preview options and redirects to a GNOME-developer project page . Admittedly I am not able to make sense and use of it. Is there actually a way to combine the flexibility of the command line with the print quality that I obtain from that "Print to File" option in the GUI evince? My test case, again, would be to create from the command line a PDF out of a source document printed with two pages per sheet. Thanks for thinking along.