How do you remove an invalid remote branch reference from Git?

Question

In my current repo I have the following output:

$ git branch -a
* master
  remotes/origin/master
  remotes/public/master

I want to delete <

Answer 1

All you need to do is

git fetch -p

It'll remove all your local branches which are remotely deleted.

If you are on git 1.8.5+ you can set this automatically

git config fetch.prune true

or

git config --global fetch.prune true