Shell Script to Scan directly to OCRed PDF/A

#!/usr/bin/env bash
# 2013 by Konrad Voelkel, public domain
echo "usage: ./scan-archive.sh filename.pdf title subject keywords"
echo "scanning \"$2\" on \"$3\" about \"$4\"... ($1)"
scanimage --mode Color --depth 8 --resolution 600 --format pnm > out.pnm
echo "processing... ($1)"
scantailor-cli --color-mode=black_and_white --despeckle=normal out.pnm ./
rm -rf cache out.pnm
tiff2pdf -o "$1" -z -u m -p "A4" -F -c "scanimage+unpaper+tiff2pdf+pdftk+imagemagick+tesseract+exactimage" -a "Author Name" -t "$2" -s "$3" -k "$4" out.tif
rm -f out.tif
echo "converting to PDF 1.4 ($1)..."
mv "$1" "$1.bak"
pdftk "$1.bak" dump_data > data_dump.info
pdftk "$1.bak" cat output "$1.bk2" flatten
echo "OCR in lang deu... ($1)"
convert -normalize -density 300 -depth 8 "$1.bk2" "$1.png"
tesseract -l deu -psm 1 "$1.png" "$1" hocr
convert "$1.png" "$1.jpg"
hocr2pdf -i "$1.jpg" -s -o "$1.bk2" < "$1.html"
echo "Inserting metadata... ($1)"
pdftk "$1.bk2" update_info data_dump.info output "$1"
rm -f "$1.bak" "$1.bk2" data_dump.info
rm -f "$1.png" "$1.jpg" "$1.html" "$1.pdf"
echo "done. wrote file. ($1)"
echo "validating... ($1)"
java -jar jhove/bin/JhoveApp.jar -m PDF-hul "$1" |egrep "Status|Message"