It appears to be incorrect with oddities like ps aux, which isn't the same as ps -a -u -x since -u expects a user list (and then reads in -x as a user). But thi

It appears to be incorrect with oddities like ps aux, which isn't the same as ps -a -u -x since -u expects a user list (and then reads in -x as a user). But this is a weird case because of backward compatibility.