In the following I show a small piece of code to scan PDF files from commandline:

#!/bin/bash cat « EOF  — $0 — Scan Images -> PNG-Archive & PDF Parameters:    (1) Name    -> Scanning: counter_start counter_increment    -> Postprocessing:        -rotate (by 90 deg)       -gray (keep it grayscale) EOF

function DIE { echo “$@”>&2; exit -1; } function is_installed {    while [[ -n $1 ]]; do       [[ -z $( type -p $1  ) ]] && DIE “missing: $1”       shift    done } #is_installed convert pdftk scanimage

[[ -z $1 ]] && DIE “missing name” NAME=$1 shift

if [[ -n $2 ]]; then    CNT=$1    CNT_INC=$2    shift 2

   MODE=Lineart    RES=300    echo “Scanning images”    scanimage –batch=$NAME”_%d”.tif –batch-increment $CNT_INC –batch-start $CNT –source ADF –mode $MODE –resolution $RES -x 210 -y 297 -v    exit fi

#unpaper –layout double –output-pages 2 #http://unpaper.berlios.de/unpaper.html

ROTATE=””

GRAY=”-threshold 50%”

while [[ -n $1 ]]; do

   case $1 in 

      -rotate) ROTATE=”-rotate 90”; shift; ;;

      -gray) GRAY=””; shift; ;;

      *) shift; ;;

   esac

done

echo “Processing images:”

for FILE in $NAME*tif; do

   echo “Processing “$FILE”:”

   PREFIX=echo $FILE | sed 's/.tif//g'

   LIMITS=”-limit memory 512 -limit map 512”

   PAGE=”$ROTATE -page a4 +repage”

   COMPRESSION=”-compress Group4”

   #[[ ! -e $PREFIX.png ]] && convert $LIMITS $GRAY -monitor $FILE $PREFIX.png

   [[ ! -e $PREFIX.pdf ]] && convert $LIMITS $PAGE $GRAY $COMPRESSION -monitor $FILE $PREFIX.pdf

done

echo “Creating PDF”

CNT_MAX=find -name "$NAME*pdf" | tr -cd 0-9"\n" | awk '$1>max{max=$1}END{print max}'

FILES=””

for I in seq 1 $CNT_MAX; do FILES=$FILES” ${NAME}_$I.pdf”; done;

pdftk $FILES cat output $NAME.pdf

echo “Creating archive”

#tar cvjf ${NAME}_png.tar.bz2 ${NAME}*png

tar cvjf ${NAME}_tif.tar.bz2 ${NAME}*tif

echo “Cleanup”

rm ${NAME}_.pdf *tif #png