#!/bin/bash

IFS=$'\n'
pdfs=`find $1 -iname "*.pdf"`

for i in $pdfs; do
    # On va chercher le format du pdf
    info=`pdfinfo "$i"`
    #echo  "$info"
    size=`echo "$info" | grep "Page size" | cut -d':' -f2`;
    # On enlève les espaces
    size=${size//[[:blank:]]/};
    #echo "Size" $size
    # On va chercher le format du pdf
    page=`echo "$info" | grep "Pages" | cut -d':' -f2`;
    # On enlève les espaces
    page=${page//[[:blank:]]/};
    #echo $size
    if [ $size = "419.528x595.276pts" ] && [ $page = "1" ]; then 
        outfile=${i%.pdf}_a4.pdf
        if ! [ -f $outfile ]; then
            echo "On double $i vers $outfile"
            pdfnup --suffix a4 $i $i --outfile $outfile
        fi
    fi
done