Optical Character Recognition

#!/bin/bash

datei='irgendwas.pdf'

test -f all.txt  && rm all.txt
for (( irun=0 ; irun < 27 ; irun++ ))
do
 echo "Seite ${irun}"
 convert  -density 100 ${datei}[${irun}] -compress none -depth 8 testma.tif
 tesseract testma.tif testma -l deu
 cat testma.txt >> all.txt
done