Here are some options, ranging from informal to formal:
Informal:
* "Hiya, how's it goin'?" - This is a very common and casual greeting.
* "How's it wi' ye?" - This is another informal greeting, more common in some dialects.
* "Alright, mate?" - This is a very casual greeting, often used between friends.
* "How's things?" - This is a slightly more formal way of asking how someone is doing.
Formal:
* "Good day, how are you?" - This is a more polite and formal greeting.
* "How do you do?" - This is a very formal greeting, often used in more formal settings.
Other variations:
* "How's the day treatin' ye?" - This is a playful and slightly more poetic way of asking how someone is doing.
* "What's the crack?" - This is a common way to ask what's happening, and can be used as a greeting.
It's important to note that these are just a few examples, and there are many other ways to say "Hi, how are you doing?" in Scottish. The best way to learn is to listen to native speakers and observe how they use different greetings in different situations.