BASH read single key action

#!/bin/bash
###################################################################### 
#Copyright (C) 2022  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, version 3 of the License.

#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 .
###################################################################### 

while [ 1 ]
do
  read -sn1 k
  [[ "$k" == "w" ]] && echo "Up" 
  [[ "$k" == "s" ]] && echo "Down" 
  [[ "$k" == "a" ]] && echo "Left" 
  [[ "$k" == "d" ]] && echo "Right" 
done