I think they're referring to this, https://linux.die.net/man/5/magic https://linux.die.net/man/5/magic given the notation. That said I don't really see how it'

I think they're referring to this, https://linux.die.net/man/5/magic https://linux.die.net/man/5/magic given the notation. That said I don't really see how it'd be all that relevant to the discussion so maybe i'm missing something else.