- How do you do (used as a greeting after you have been formally introduced to a person) - How are you doing? = How are you? (informal greeting) - It's a pleasure to meet you / Pleased to meet you (formal conversations) - Hi / Hello / Hey / How are things? / What's new? / What's up? / How's it going? / How are you doing today? (informal conversations)

what's up ? how are you ? how do you do ? ^_^