Script to add margin to a PDF file and merge with page number on footer(can be header also)

convertpdf.sh

#!/bin/bash -f
prepocesse() {
    pdfinfo newbook.pdf

    pdflatex pageNumbers.tex
    pdftk newbook.pdf burst output tmps/file_%04d.pdf
    pdftk pageNumbers.pdf burst output tmps/number_%04d.pdf
}

format() {
    pdfcrop --margin "29 50 29  50"  tmps/file_${1}.pdf tmps/filem_${1}.pdf ; 
    pdfjam --outfile tmps/file_a4_${1}.pdf --paper a4paper  tmps/filem_${1}.pdf ; 
    pdftk tmps/file_a4_${1}.pdf background tmps/number_${1}.pdf output tmps/new-${1}.pdf ; 

}
postprocess() {
    pdftk tmps/new-????.pdf output new.pdf
    gs -sDEVICE=pdfwrite -dCompatibilityLevel=1.4 -dPDFSETTINGS=/screen -dNOPAUSE -dQUIET -dBATCH -sOutputFile=new-s.pdf new.pdf
    cp new-s.pdf ..
}

PAGES=64
JOBS=8
pid=()

prepocesse 
for i in {0..7} ; do
    for ((j=1; j<$PAGES; j=$j+8)); do
        format $(printf "%0.4d" $(($i+$j)))
        # sleep 0.5
    done &
    pid[$i]=$?
done

for i in {0..7}; do
    wait ${pid[$i]}
done

postprocess

echo done $(date)

Pagenumber.tex

\documentclass[12pt,a4paper]{article}
\usepackage{multido}
\usepackage[hmargin=.8cm,vmargin=1.5cm,nohead,nofoot]{geometry}


\begin{document}
\multido{}{1588}{\vphantom{x}\newpage}
\end{document}