I don't have a bell. As above a polite greeting works fine. But I avoid shared-use paths whenever possible.
It's weird, but the nubheads never shout "Get on the fxxking shared-use path!!"
I've got a miniature Italian cow bell hanging freely from the handlebars on one bike - most of the time it has some foam stuffed in it to stop it tinging, but when I'm on the shared-use path (Exe Estuary Trail) down to Exmouth (beats the Exmouth road, which shows how awful the Exmouth road is to cycle), out comes the foam, and the bell tinkles away randomly for the many people, children, dogs (some actually on leads, some on long bits of string across the SUP), prams, groups of people taking up the entire width (even a group of two will attempt to do that) who will need to move for me to pass by.
FWIW, it's good to see the Trail being so well used by so many different types of users, so for once I'm not moaning (apart from the dog owners who let their dogs wander randomly along/across it, especially the ones who make no effort at control even when they've heard the bell).