Rebase all local branches and scrub those that are already merged.

git-clean-branches

#!/bin/bash

set -e
git detach origin/master

set +e

mapfile -t BRANCHES < <(git branch | grep -v -e '\*' -e '\+')
for branch in "${BRANCHES[@]}"; do
    branch_name="$(echo "$branch"|awk '{print $1}')"
    echo "=== $branch_name ==="

    git switch "${branch_name}"
    git rebase origin/master || git rebase --abort
    git detach origin/master
    git branch -d "${branch_name}"
done

git-push-local-branches

#!/bin/bash

mapfile -t BRANCHES < <(git branch | grep -v -e '\*' -e '\+')
for branch in "${BRANCHES[@]}"; do
    echo "Pushing local branch: ${branch}"
    git switch "${branch}"

    git push origin +HEAD
done
git switch --detach origin/master