dummy

dummy

# without `:` the values are optionals
while getopts abc flag;
do  
    case "${flag}"
      in
        a ) echo $optarg ; pa="$OPTARG"; echo $pa;;
        b ) pb=${OPTARG};;
        c ) pc=${OPTARG};;
        \?) echo "Invalid option: kubde" 1>&2 ;;
        : ) echo "Invalid option: $OPTARG requires an argument" 1>&2;;
    esac
done

echo 'P1:' "$pa" 
echo $P2
echo $P3