If you are using bash:

1. Edit or create a .inputrc file in your $HOME direcotry
   • vim $HOME/.inputrc  (for vim users, can substitute gedit for ‘vim’
2. Append the following line:
   • “set bell-style none” (without the “”)

If you are using ‘Terminal’ on Mac OSX see this stackoverflow question.

(To paraphrase: “With Terminal open, go to ‘Terminal’ > ‘Perferences…’, the click the ‘Profiles’ tab,  then go to ‘Advanced’ and there is a ‘Bell’ subsection where you can uncheck “Audible Bell.”)