pdfjam --nup 2x2 flyer.pdf '1,1,1,1,2,2,2,2' -o flyers.pdf
This turns a 2 page PDF into another 2 page PDF, but with the original pages duplicated in a 2x2 grid, handy for 2-sided flyer printing. I used scissors to cut them up, which is fine for the 3 sheets I needed to print, for more a guillotine would be useful.
@mathr ohhh did not know that one thanks
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