Turn a regular A4-format PDF into a neat little book.
#!/bin/sh
A4FILE='original'
pdftops -paper match $A4FILE.pdf - | \
psbook -s12 | \
psnup -2 -w21cm -h29.7cm -Pa4 | \
ps2pdf -dMaxSubsetPct=100 -dCompatibilityLevel=1.4 \
-dSubsetFonts=true -dEmbedAllFonts=true - $A4FILE.booklet.pdf