How to remove local branches that have been closed on master

In Git Bash/ Git CLI run the commands as follow (from whichever branch you are currently on):

git remote prune origin

Then:

• checkout master
• update it

and run in Git Bash/ Git CLI:

$ git branch --merged | grep -v "\*" | xargs -n 1 git branch -

And that's it!

To delete all local branches except master:

$ git branch | grep -v "master" | xargs git branch -D

Some commands to a further clean up: Git clean