L A Walsh wrote:

I didn't care

Some users do care: they don't want grep to output binary junk that may mess up their screen.

Problem is on a mailbox, different emails can have different encodings.

There's no general solution to that problem. No matter what grep does, it will mishandle some cases. At best the user will get an approximation to what is really wanted. And there will be some cases where grep's default behavior (no matter what the default is) will do the "wrong" thing.

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