#!/bin/sh

# unite pdf after double side scanning
if [ -z "$1" ] || [ -z "$2" ]; then
    echo "Usage: unite-pdf odd even [output]"
else
    [ -z "$3" ] && { 3="$(mktemp)" ; echo "$3" ; }
    pdftk "A=$1" "B=$2" shuffle A Bend-1 output "$3"
fi