SHA256verify hash from a provided hash and file script

sha256verify.sh

#!/bin/bash
#
# Copyright 2018 DESYLLAS DIMITRIOS
#
# Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction,
# including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software,
# and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
# The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
# WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
#
#################################### DOCUMENTATION #############################
#
# Arguments:
# -f,--file The file you want to check the sha256checksum
# --hash The SHA256 checksum
#
################################################################################

TEMP=`getopt -o f: --long hash:,file: -n 'sha256verify.sh' -- "$@"`

if [ $? != 0 ] ; then echo "Terminating..." >&2 ; exit 1 ; fi

# Note the quotes around `$TEMP': they are essential!
eval set -- "$TEMP"

file=""
hashSum=""

while true ; do
    case "$1" in
        -f|--file) file=$2 ; shift 2 ;;
        --hash) hashSum=$2 ; shift 2 ;;
        --) shift ; break ;;
        *) echo "Uknown Argument \`$1\`" ; exit 1 ;;
    esac
done

if [ ! -f ${file} ]; then
  >&2 echo "File does not exist"
  exit 1;
fi

filehash=$(sha256sum ${file} | awk '{print $1}')

BLUE='\033[0;36m'
NC='\033[0m' # No Color
RED='\033[0;31m'
GREEN='\033[0;32m'

if [ ${filehash} == ${hashSum} ]; then
  echo -e "${GREEN}File is not corurpted.${NC}"
  echo -e "The provided file: ${BLUE}${file}${NC}"
  echo -e "Provided checksum: ${BLUE}${hashSum}${NC}";
else
  echo -e "${RED}File seems to be corurpted.${NC}"
  echo -e "The provided file: ${BLUE}${file}${NC}"
  echo -e "Provided checksum: ${BLUE}${hashSum}${NC}";
  echo -e "Calculated checksum: ${BLUE}${filehash}${NC}";
fi