-u quiesce server, killing user threads
-k stop at once
So -k should override -u and stop, just like onmode -k, or not?
-y overrides the usual questions (are you really sure? users will be
killed...)
IIRC, even -k performs a checkpoint and closes cleanly, it's not like
"kill -9" (instead of Oracle's "shutdown abort", which kills without
checkpoint).
Oh well, indeed -yuk or -yuck sounds better... ;-)