xkbbell(1) on Linux
The text ac4f648ec0e3, as Debian 12 (Bookworm), Debian 11 (Bullseye), Debian 10 (Buster), Debian 9 (Stretch), Debian 8 (Jessie) shipped it.
XKB extension user utility
Flags it lists
-
-bf -
-dev -
-display -
-force -
-help -
-kf -
-nobeep -
-synch -
-v -
-version -
-w