A simple script to form a multipage PDF using scanimage / sane. It is hard-coded to my MF4270 device id as provided by scanimage -L.

scan.sh

outname=$1
startdir=$(pwd)
tmpdir=scan-$RANDOM
DEVICENAME=pixma:04A926B5_SFF780310398A

if [ $# -lt 1 ]
then
        echo "Usage: scan.sh <filename.pdf>"
        exit 1;
fi

cd /tmp
mkdir $tmpdir
cd $tmpdir
echo "################## Scanning ###################"
scanimage -d $DEVICENAME --source "Automatic Document Feeder" --mode Gray --batch --format=tiff --resolution 150
echo "############## Converting to PDF ##############"
#Use tiffcp to combine output tiffs to a single mult-page tiff
tiffcp -c lzw out*.tif output.tif
#Convert the tiff to PDF
tiff2pdf output.tif > $startdir/$outname
cd ..
echo "################ Cleaning Up ################"
#rm -rf $tmpdir
cd $startdir

it helped, thanks!