Key / Value Arguments in Shell

arg.sh

for i in "$@"
do
    case $i in
        -o=*|--one=*)
            ONE="${i#*=}"
            shift
        ;;
        -t=*|--two=*)
            TWO="${i#*=}"
            shift
        ;;
        -th=*|--three=*)
            THREE="${i#*=}"
            shift
        ;;
        --default)
            DEFAULT=YES
            shift
        ;;
        *)
            # unknown option
        ;;
    esac
done
      
echo "One = ${ONE}"
echo "Two = ${TWO}"
echo "Three = ${THREE}"