Split PDF in single page PDFs

split_pdf.bash

#!/bin/bash
# Splits the PDF in single pages PDFs which are saved in a subfolder called extracted and the page name. 
# If the pages does already exist, it will increment the page number by one, until the filename is not occupied.

#sudo apt-get install pdftk
#chmod +x split_pdf.bash
#./split_pdf.bash source.pdf

PDFFILE=$1
echo "File: "$PDFFILE
if [ ! -f $PDFFILE ]; then
    echo "File not found!"
    exit 1
fi
pages=$(pdfinfo "${PDFFILE}" | grep Pages | sed 's/[^0-9]*//')
echo "Pages: "$pages
mkdir -p extracted
j=0
for i in $(seq $pages)
do
    
    k=$((i+j))
    while [ -f extracted/page$k.pdf ];
    do
        echo "File already exists: extracted/page"$k.pdf 
        j=$((j+1))
        k=$((i+j))
    done
    echo "extracting page: "$i" to "$k
    pdftk $PDFFILE cat $i output extracted/page$k.pdf        
done