Hi Eric, Eric Blake <ebl...@redhat.com> writes:
> Remember, the POSIX synopsis lines lists two distinct invocation > styles: > > tail [-f] [-c number|-n number] [file] > tail -r [-n number] [file] Yep, I was going to mention this too. But I was not sure if it should have a mention in the description to make it more clear. > which means undefined behavior from the POSIX point of view if -f and > -r are ever attempted at the same time. Therefore, whatever GNU > decides to do on that combo (preferably, diagnose it early with an > error and exit, since I can't figure out anything else useful it could > do) will not violate POSIX. I think it should be standardized to fail when -f and -r are used together. That seems like the only reasonable behavior to me. Thanks, Collin
