# booklet from DVI with a5paper
dvips -t a5 -Ppdf $1.dvi
ratio=1
psbook $1.ps | psnup -pa4 -Pa5 -2 | replace.pl -a i '(%%DocumentPaperSizes:) a5' '$1 A4' | replace.pl -a i '(%%BoundingBox:) 0 0 420 596' '$1 0 0 596 840' >$1-a4-all.ps
psselect -o $1-a4-all.ps >$1-a4-front.ps 
psselect -e $1-a4-all.ps >$1-a4-back.ps 
psselect -r $1-a4-back.ps >$1-a4-back-rev.ps