Sometimes its annoying to hear a beep sound everytime you hit on tab button for completion on linux console. Here is the quickway how to disable that beep sound.
All you have to do is add the following line in /etc/inputrc file or uncomment it if it presents.
set bell-style none
the following image is the default inputrc file on centos system. You can uncomment the line which says "set bell-style none" for disabling tab completion beep sound.