Kod för att utföra ett kommando fram tills en knapp släpps.

prompt='Press w for forward or n for backward Q for exit '
echo -n "$prompt"
while read -n1 char
do
    case $char in
        n | N )
            gpio write 1 0;
            clear
echo 'Press w for forward or n for backward Q for exit '
            ;;
        y | Y )
            gpio write 2 0;
            clear
echo 'Press w for forward or n for backward Q for exit '
            ;;

  q | Q )
            
            clear

break;            
;;
        * )
            echo -ne "\nInvalid character '$char' entered. $prompt"
    esac
done