simple_stub.sh

for (( i=1; i<=$#; i++ ))
do
	arg=${@:$i:1}   # Gets the string i
	val=${@:$i+1:1} # Gets the string i+1

	case $arg in
	-p)
		package=$val
		# The parse the next argument and not this value
		((i++))
		;;
	--package=*)
		# Split at = char and remove the shortest match from beginning
		package=${arg#*=}
		;;
	-i|--install)
		command="install"
		;;
	*)
		echo "Unknown argument number $i: '$arg'"
		;;
	esac
done