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bash - Detect Apple Silicon from command line

How can I detect from a shell script that it is running on M1 Apple hardware?

I want to be able to run a command line command so that I can write an if-statement whose body will only be executed when run on a mac with an M1 processor (and at least macOS Bug Sur, naturally).

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uname -m

will return arm64 as opposed to x86_64

if [[ `uname -m` == 'arm64' ]]; then
  echo M1
fi

or, as @chepner suggested

uname -p

will return arm as opposed to i386

if [[ $(uname -p) == 'arm' ]]; then
  echo M1
fi

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