RE: grep command doc - point out that you can chain now

[Drew Adams]

    >     I don't think it should be pointed out in the manual because
    >     you would expect it to work.  However it might be worth mentioning
    >     it in NEWS, so that users who have tried it in the past know it
    >     will now work.
    >
    > I don't think it's obvious ("you would expect it to work"),
    > since Emacs `grep' is asking for input to the Unix/GNU-Linux `grep'
command.

    IMHO, it should suffice to say that "M-x grep" expects _any_ shell
    command whose output resembles that of Grep.  That includes, for
    example, "find SOMETHING | xargs fgrep" etc.

Yes indeed. That's even more general, and I wasn't aware of that. It's
important to include the example, to illustrate what is meant by "shell
command whose output resembles...".