A shell function to purge all local git branches that do not exist on remote.

purge_github_branches.sh

func purgeLocalGitBranches() {
        red='\033[0;31m'
        echo "${red}Purging local branches no longer found on remote..."
        git fetch -p && for branch in `git branch -vv | grep ': gone]' | awk '{print $1}'`; do git branch -D $branch; done
}