databasher

  printf '(%s)\n' "one two" "three four five"
  echo "How you doin'?"

  while read -r line; do
    eval command=($line)
    command+=("arg with spaces" "other arg")
    "${command[@]}"
  done < lines.txt

  (one two)
  (three four five)
  (arg with spaces)
  (other arg)
  How you doin'? arg with spaces other arg

  # store the command in an array
  X=(echo "A B")
  # execute the command
  "${X[@]}"

  A B

  while getopts :o:h-: option
  do case $option in
         h ) print_help;;
         o ) output_file=$OPTARG;;
         - ) case $OPTARG in
                 help ) print_help;;
                 output-file=* ) output_file=${OPTARG##*=};;
                 * ) echo "bad option $OPTARG" >&2; exit 1;;
             esac;;
         '?' ) echo "unknown option: $OPTARG" >&2; exit 1;;
         : ) echo "option missing argument: $OPTARG" >&2; exit 1;;
         * ) echo "bad state in getopts" >&2; exit 1;;
     esac
  done
  shift $((OPTIND-1))
  (( $# > 0 )) && printf 'remaining arg: %s\n' "$@"