Count Vowels - Shell Script - BASH - GREP

#!/bin/bash
######################################################################
#Copyright (C) 2019  Kris Occhipinti
#https://filmsbykris.com

#This program is free software: you can redistribute it and/or modify
#it under the terms of the GNU General Public License as published by
#the Free Software Foundation, either version 3 of the License, or
#(at your option) any later version.

#This program is distributed in the hope that it will be useful,
#but WITHOUT ANY WARRANTY; without even the implied warranty of
#MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#GNU General Public License for more details.

#You should have received a copy of the GNU General Public License
#along with this program.  If not, see <http://www.gnu.org/licenses/>.
######################################################################

if [ $# -lt 1 ];then
  echo "Input needed."
  echo "Example: $0 Films By Kris"
  exit 1
fi

str="$*"
vowels="$(echo "$str" |grep -o -i "[aeiouAEIOU]")" #and some times 'y'
count="$(echo "$vowels"|wc -l)"
echo "'$str' has $count vowels."
echo -e "They are:\n$vowels"