git delete-merged

.gitconfig

[alias]
	delete-merged = !bash -c '\
		REMOTE=$1 && \
		REMOTE=${REMOTE:="origin"} && \
		echo "Fetching $REMOTE" && \
		git fetch $REMOTE --prune  && \
		git branch -vv | grep "gone]" | awk \"{ print \\$1 }\" | xargs git branch -d' - 
		
		
# usage: `git delete-merged`
#    Deletes all local branches that are tracking a remote branch which no longer exists.
#    If the local branch has unmerged changes, it prints a warning for that branch instead.