Parsing bash/shell command line options using getopts

parseCmdInBetterway

#!/bin/bash
usage()
{
cat << EOF
usage: $0 options

This script can download 64 or 65 version centos.

OPTIONS:
	-h	Show the help and exit
	-v	Download type, can be '6.4' or '6.5'
	-s	Harddisk size
	-e	Verbose
EOF
}

HDD_SIZE=
VERSION=
VERBOSE=
while getopts "hv:s:e" opt
do
	case $opt in
    		h)
      			usage
			exit 1
      			;;
    		v)
      			VERSION=$OPTARG
			if [ $OPTARG == 64 ] ; then
				echo "64"
				# your script
      			elif [ $OPTARG = 65 ] ; then
				echo "65"
				# your script
      			else
				echo "Can't support version: $OPTARG. Must be either 64 or 65"
     						exit
			fi
      			;;
    		s)
     			HDD_SIZE=$OPTARG
			if  [[ ! ("$OPTARG" =~ ^[0-9]+$) ]]; then
   				 echo 'Hard disk size should be in numeric value.'
   			 	exit 1
			fi
      			;;
		e)
			VERBOSE=1
			;;
		?)    
			usage
        		exit 
			;;
  		esac
done


if [[ -z $VERSION ]] || [[ -z $HDD_SIZE ]] 
then
     usage
     exit 1
fi

# Rest of your script goes here

parseCmdOptions

#!/bin/sh -e

# control variables
NO_ARGS=0 
E_OPTERROR=85 # non-reserved code
OPT_EXIST=0

# print usage
usage(){
  echo "Usage: ./parseCmdOptions -v [64|65] -s [hdd size]"
}

#check if there isn't any argument 
if [ $# -eq $NO_ARGS ]; then
   usage
   exit $E_OPTERROR
fi

while getopts :hv:s: opt; do
OPT_EXIST=1
case $opt in
    h)      
      usage
      exit $E_OPTERROR
      ;;
    v)
      if [ $OPTARG == 64 ] ; then
         echo "64"
         # your script

      elif [ $OPTARG = 65 ] ; then
         echo "65"
         # your script
      else
        echo "Can't support version: $OPTARG. Must be either 64 or 65"
        exit
fi
      ;;
    s)
      HDD_SIZE=$OPTARG
      ;;
    
    \? )    
        echo "Invalid option: -$OPTARG" >&2
        usage
        exit $E_OPTERROR;;
    * ) echo "Option -$OPTARG requires an argument" >&2
        usage
        exit $E_OPTERROR;;    
  esac
done

# check if there wasn't any option
if [ $OPT_EXIST -eq $NO_ARGS ]; then
   usage 
   exit $E_OPTERROR
fi

# rest of your script