#!/bin/bash

v_flag=""
flag=""

while getopts ':v:' flag; do
  case "${flag}" in
    v) v_flag="${OPTARG}";;
    *) echo "invalid flag"
       exit 1 ;;
  esac
done

if [[ "$v_flag" == "" ]]
then
	find . -not -type d | xargs grep $@ 2>/dev/null
else
	find . -not -type d | grep -v "$v_flag" | xargs grep $@ 2>/dev/null
fi