"threaded" pdf to txt

#script.sh
#!/bin/bash
echo "starting"
dir=$(pwd)
count=0
for f in *.pdf
do
    if [ $count -eq 4 ]; then
        wait
        count=0
    fi
    ./pdfToTxt.sh $f &
    count=$((count+1))
    echo $count
done
echo "done"

#pdfToTxt.sh
#!/bin/bash
echo "converting "$1
gs -o /tmp/$1.tif -sDEVICE=tiffg4 -r720x720 -g6120x7920 $1 > /dev/null
tesseract /tmp/$1.tif $1 > /dev/null
rm /tmp/$1.tif
echo "converted"