[bug #29551] [ENH] grep listens in vain forever on STDIN even if -r flag (and no file) is supplied

[Paolo Bonzini]

Update of bug #29551 (project grep):

                  Status:                    None => Duplicate              
             Open/Closed:                    Open => Closed                 

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Follow-up Comment #1:

Yes, this came up other times, and there's even a patch from Apple to do
that.  I don't know if the patch supports giving no warning for "-".  My main
problem is what happens if someone has GREP_OPTIONS=-r; there were reports of
having GREP_OPTIONS=-E which is much more insane, so I wouldn't be surprised
to see that in the wild.

An option d) is issue a warning if the input is a tty.  I don't recall if
that's what Apple's patch implements, I don't think so but it would be my
preferred choice.

Closing as duplicate, but anyway thanks for the ideas!

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