A biblioteca Readline possui a variável bell-style
:
Controls what happens when Readline wants to ring the terminal bell. If set to ‘none’, Readline never rings the bell. If set to ‘visible’, Readline uses a visible bell if one is available. If set to ‘audible’ (the default), Readline attempts to ring the terminal’s bell.
Você pode colocar na seguinte linha do arquivo ~/.inputrc
:
set bell-style none