pdf_lock.sh

#!/bin/bash

set -eu

readonly HOME_DIR=$(pwd)

readonly INPUT_DIR="${HOME_DIR}/dataset"
readonly RESULT_DIR="${HOME_DIR}/result"

if [ ! -d "${RESULT_DIR}" ]; then
    mkdir "${RESULT_DIR}"
fi;

ls -1 "${INPUT_DIR}" | while read -r filePath

do
    password="${filePath/'.pdf'/}"
    echo "Succeed to lock!! filename: ${filePath} password: ${password}"
    qpdf --encrypt "${password}" "${password[0]}" 40 -- "${INPUT_DIR}/${filePath}" "${RESULT_DIR}/${filePath}"
done