BTW, in old consoleUI you could as ID enter just beginning of name or hash(as little as one char, but needing to watch out for deleting more than you'd like if not unique), and you can still do that with hash but has now changed to instead enter any chars of title and add * either in front or after pattern which is really nice imho, though also now is much slower than before, with a 2'ish secs delay after each operation(even with a single torrent running only), not there before.
Also, not home know and can't remember fully, but some commands, I believe like this one, doesn't auto-login to localhost daemon anymore, so if using localhost daemon, you now need precede the command with 'connect xxx' i.e 'connect xxx ; rm -c ID'. (I have shell aliases/functions setup for this and all other of my used commands, so that is why I cannot remember it)