Convert ePub to PDF in Linux command line.sh

    #!/bin/bash
    INPUT_DIR=
    OUTPUT_DIR=
    OUTPUT_FILE=merge.pdf
    #INPUT DIR must contain the unzipped ebook file
    #unzip file.epub
    for i in $( ls $INPUT_DIR ); do
    echo $i
    wkhtmltopdf "$INPUT_DIR/$i" "$OUTPUT_DIR/$i".pdf
    done

    pdftk `ls "$OUTPUT_DIR"` cat output "$OUTPUT_FILE"