Safely remove local fully merged branches

git-remove-branches

#!/bin/bash

# This has to be run from master
git checkout master

# Update our list of remotes
git fetch
git remote prune origin

# Remove local fully merged branches
git branch --merged master | grep -v 'master$' | xargs git branch -d

# Show remote fully merged branches
echo "The following remote branches are fully merged and will be removed:"
git branch -r --merged master | sed 's/ *origin\///' | grep -v 'master$'

read -p "Continue (y/n)? "
if [ "$REPLY" == "y" ]
then
   # Remove remote fully merged branches
   git branch -r --merged master | sed 's/ *origin\///' \
             | grep -v 'master$' | xargs -I% git push origin :%
   echo "Done!"
   say "Obsolete branches are removed"
fi

echo "Please, tell your teammates to run 'git remote prune origin' command in order to clean their local repository"

We use git-obsolete-branch-remover useful as it lists or removes local or remote Git branches based on last commit date and merge status.
https://github.com/vackosar/git-obsolete-branch-remover

The script fails when used with more remotes with branches than origin, and assumes master is up to date with upstream, so simplified a bit with that in mind:

#!/bin/bash
set -e

git fetch --all --prune

# Remove local fully merged branches
git branch --merged upstream/master | sed 's/^[ *]\+//' | grep -v '^master$' | xargs -r -d'\n' git branch -D

# Remove origin/ fully merged branches, except for master
git branch --remotes --merged upstream/master | sed 's/^[ *]\+//' | grep '^origin/' | grep -v '/master$' | sed 's/^origin\///' | xargs -r -d'\n' git push --delete origin

git fetch --all --prune

EDIT: added -r to xargs to skip empty lists

@himdel Just a tip to simplify your sed work, you can use any delimiter to avoid escaping, e.g.: sed 's|^origin/||g'

If you want to detect squash merges and the likes as well, git-delete-merged-branches may be of interest.