Script para cortar pdf's en formato de libro

libro.sh

#!/usr/bin/env bash 


DIVISOR=16
CORES=$(cat /proc/cpuinfo| grep processor | wc -l)

NOW=$(date +%s)
export TMP_PATH="${NOW}"
mkdir $TMP_PATH

error() {
    echo $@ > /dev/stderr 
    exit 1
}

get_pages() {
    local PAGES=$(pdfinfo "$1" | grep "Pages" | cut -d":" -f2 | sed "s/^[ ]\+//g")
    echo $PAGES
}

get_ranges() {
    local TOTAL=$1
    local D=$2
    local I=1
    local F=0 

    while [ $I -lt $TOTAL ]; do 
       let "F = $I + D - 1"
       [[ $F -gt $TOTAL ]] && F=$TOTAL
       echo "$I-${F}"
       let "I = $I + $D" 
    done 

}

process_range() {
    TMP_FILE="${TMP_PATH}/p-$2.pdf"
    pdftk "$1" cat $2 output $TMP_FILE
    pdfbook --outfile "${TMP_PATH}/pages-$2.pdf" "${TMP_PATH}/p-$2.pdf"
    rm $TMP_FILE
}

PAGES=$(get_pages "$1")

if [ $PAGES -lt 1 ]; then 
    error "El libro no tiene paginas"
fi

export -f process_range

get_ranges $PAGES $DIVISOR | xargs -n1 -I {} -P $CORES bash -c "process_range \"$1\" {}"