CODE EXAMPLE FOR SHELL

remove all branches deleted on remote

# Shorthand for deleting localy all branches already deleted on remote
# set this alias in git.config
git config --global alias.gone "! git fetch -p && git for-each-ref --format '%(refname:short) %(upstream:track)' | awk '$2 == "[gone]" {print $1}' | xargs -r git branch -D"
# then run
git gone