#!/bin/bash
# arguments $1 pdf, $2 signatures
book=$1
# Get the number of pages
num_pages=$(pdftk "$1" dump_data | grep NumberOfPages | awk '{print $2}')
# Round up to the nearest number divisible by 4
rounded_num=$(echo "((($num_pages+3)/4)*4)" | bc)
signatures=$rounded_num
#echo $signatures
pdfbook2 "$book" -s --paper=letterpaper  --top-margin=10 --bottom-margin=5 --outer-margin=20 --signature=$signatures --inner-margin=80