Follow-up Comment #5, bug #25197 (project grep):
Sorry for being a bit too terse. The main reason why this cannot be changed
is interoperability. Even though POSIX does not include -r, other grep
implementations such as NetBSD grep do, and it would be bad to break
compatibility with it (as well as with scripts written in the past ~20 years).
I do see the point in your proposal, but it's not really feasible to go
beyond warning.
> As another example, note that the git project's 'git grep'
> defaults to the current directory without a '.' argument.
This is different; git grep does not have a non-recursive mode (AFAICT) and
cannot ever get its input from stdin.
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