sample

#!/usr/bin/env bash

args=()


main() {
  local 'arg'
  if (( "${#args[@]}" > 0 )); then
    printf 'Operands:\n'
    for (( arg = 1; arg <= "${#args[@]}"; arg++ )); do
      printf '  %d: [%s]\n' "${arg}" "${args[arg-1]}"
    done
  fi
}


batch() {
  local 'file'
  for file; do
    if [[ "${file}" == '-' ]]; then
      file='/dev/fd/0'
    fi
    if [[ ( -c "${file}" || -f "${file}" ) && -r "${file}" ]]; then
      mapfile -O "${#args[@]}" -t 'args' < "${file}"
    fi
  done
}


while [[ "${1++}" ]]; do
  case "${1}" in
  ( '-b' | '--batch' )
    batch "${2}"
    shift
    ;;
  ( '--' )
    args+=( "${@:2}" )
    break
    ;;
  ( * )
    args+=( "${1}" )
    ;;
  esac
  shift || break
done


main