This shell script converts all PDF files to JPG files

pdf2jpg_recursive.sh

#!/bin/bash
# author: ravi joshi
# date: 19 mar 2020
# this shell script converts all PDF files to JPG files
# it walks recursively inside the given directory
# requirement: it uses ImageMagick command line tool for PDF to JPG convertion.
# check here (https://github.com/ravijo/image-video-editing#install-imagemagick-on-ubuntu-1404)
# for more information

if [ $# -eq 0 ]; then
    echo "input directory is not provided"
    exit 1
fi

# location to input directory
in_dir="$1"

# src: https://unix.stackexchange.com/a/494146
walk_dir () {
    for path_name in "$1"/*; do
        if [ -d "$path_name" ]; then
            walk_dir "$path_name"
        elif [ -e "$path_name" ]; then
            case "$path_name" in *.PDF|*.pdf)
                    printf 'Reading file: %s\n' "$path_name"
                    file_name=$(basename "$path_name")
                    dir_name=$(dirname "$path_name")
                    name_only="${file_name%.*}"
                    save_name="${dir_name}/${name_only}.jpg"
                    # printf '%s\n' "$path_name"
                    # printf '%s\n' "$save_name"
                    # src: https://github.com/ravijo/image-video-editing#covert-pdf-to-jpeg-high-quality
                    convert -density 150 "$path_name" -quality 90 -background white -alpha remove "$save_name"
                    # rm "$path_name" # uncomment this line if you want to delete the original PDF file
            esac
        fi
    done
}


walk_dir "$in_dir"