pdf-bulk-merge.sh

#!/bin/bash
#
#/pdf-bulk-merge.sh.sh <INPUT_PATTERN e.g. in_%d.pdf> <OUTPUT_PATTERN e.g. out_%d.pdf> <PAGES> <JOBS e.g. $(ls -la INPUT_PATTERN* | wc -l)

INPUT_PATTERN=$1
OUTPUT_PATTERN=$2
PAGES=$3
JOBS=$4

echo -e "Starting to work on\ninputPattern\t${INPUT_PATTERN}\npages\t${PAGES}\njobs\t${JOBS}"

_unite2() {
	fileA=$1
	fileB=$2
	fileOut=$3

	echo -e "Merging files:\t${fileA}\t${fileB}\tout:\t${fileOut}"

	qpdf ${fileA} -pages ${fileA} 1-1 ${fileB} 1-1 -- ${fileOut}	
}

_split() {
	echo "split"
}

for i in $(seq 1 $((PAGES)) $((JOBS)) )
do
	_unite2 $(echo ${INPUT_PATTERN} | sed "s/%d/$i/g") $(echo ${INPUT_PATTERN} | sed "s/%d/$((++i))/g") $(echo ${OUTPUT_PATTERN} | sed "s/%d/$i/g")
done