Simple script for deleting local already merged branches, and prune remote tracking branches where the report part no longer exists. As a practical convenience, it will not delete a few long-lived local branches such as "develop", "master", and "production". This is built on ideas from http://stevenharman.net/git-clean-delete-already-merged-bran…

prune.sh

#!/bin/sh

# Simple script for pruning local branches already merged,
# and remove remote tracking branches that have been deleted

# Default to "origin" if no remote is passed
remote=${1-origin}

# Branches to keep, regardless of their current merge state
permanent_branches="develop|master|production"

# Remove local already merged branches
git branch --merged | grep -v -E "(\*|$permanent_branches)" | xargs -n 1 git branch -d

# Retry with whatever 'git remote' outputs
git remote prune $remote || git remote prune `git remote`

Suggested addition to ~/.gitconfig:

[aliases]
  cleanup-merged = !prune-git

This assumes the above is available as prune-git in $PATH. Then it can be invoked with git cleanup-merged.