How can I delete all Git branches which have been merged?

Question

I have many Git branches. How do I delete branches which have already been merged? Is there an easy way to delete them all instead of deleting them one by one?

Answer 1

Just extending Adam's answer a little bit:

Add this to your Git configuration by running git config -e --global

[alias]
    cleanup = "!git branch --merged | grep  -v '\\*\\|master\\|develop' | xargs -n 1 git branch -d"

And then you can delete all the local merged branches doing a simple git cleanup.