"How are you doing?"It is almost invariably rendered in one of two abridged forms:
"Alright. How are you doing?"
"How ya doing?"or:
"How ya doing?"
"Alright."with the last syllable stretched far beyond its standard length.* In both cases any true sense of questioning has been lost, and it's simply a formulaic greeting/acknowledgement. I'm quite fond of (and typically use) the first. A question that requires no response? Wonderful. But I love the second. A response that requires no question? Fantastique!
* I know the first form is in broad use, but I'm trying to remember if I've heard the second form elsewhere or if it's a regional thing. Far-flung correspondents, please enlighten me.