Script to clean-up remote branches that have already been merged to master.

branch_cleanup.sh

#!/bin/bash

# Format for excluded branches: "branch|branch|branch..."
excluded_branches="master|gh-pages|HEAD"

for branch in $(git branch -r | tr -d ' ' | sed -e 's/->.*//' | egrep -v "${excluded_branches}"); do
    if git branch -r --contains "${branch}" | grep -q master; then
        git push origin ":${branch#origin/}"
    fi
done