Rudy Giuliani revealed to The Post on Friday that he shook Mayor Zohran Mamdani’s hand at the 9/11 ceremony because it was the right thing to do given the occasion — and even praised him for staying throughout.

“We ended up facing each other. I said, ‘I pray for you all the time,’ ’’ said Giuliani, 82 — who was famously dubbed “America’s mayor’’ for his steady stewardship at the helm of New York City after the Sept. 11, 2001, terror attacks in Manhattan.

“He said, ‘Thank you,’” the GOP former mayor said of the far-left current mayor — who he recently publicly urged to not attend the ceremony this year out of respect for victims’ families…

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