hash-checker - Generic recursive SHA256 creation and checking utility

hash-checker

#!/bin/sh
# shellcheck disable=2094
set -eu

cd "$(dirname "$0")" || exit 1

hash_file='hashes.txt'

case "${1-}" in
save) find . -type f -print0 ! -name "$hash_file" | sort -z | xargs -0 sha256sum | tee "$hash_file" ;;
check) sha256sum -c "$hash_file" ;;
*)
  echo >&2
  echo >&2 "$(basename "$0"): usage: $0 {save|check}"
  echo >&2
  echo >&2
  exit 1
  ;;
esac