Since using Yosemite, I've had the annoying problem of my current Terminal window flashing when backspacing on an empty line. I know on previous versions of OS X this flashing was not default, and could be toggled in accessibility settings, but I cannot find the same setting and I'm dying to get this turned off. Any known ways to get rid of it?
That is called the visual bell, and by default it’s enabled when your sound is muted. To change that setting, go into Terminal > Preferences > Profiles > <your profile> > Advanced.
You can also run
echo $'\nset bell-style off' >> ~/.inputrc
to disable Readline's use of the bell (deleting on an empty line, tab-complete, etc.). You will need to restart your session for this change to take effect.