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Re:Unix didn't use to support '#!', a brief history by anttiharju on Saturday July 16, 2022 @05:16AM (#32116391)
> never had I heard it being called "bang"

DuckDuckGo also calls exclamation points bangs https://duckduckgo.com/bang

Re:Unix didn't use to support '#!', a brief history by tyingq on Saturday July 16, 2022 @07:34AM (#32117070)
The use in the unixy area was probably reinforced by UUCP "bang paths".