#!/bin/bash
local_branches() {
  git for-each-ref --format="%(refname:short)" refs/heads
}

# Returns the name of the current branch
current_branch() {
  git symbolic-ref --short HEAD
}

saved_branch=$(current_branch)

[[ "${saved_branch}" != "master" ]] && git checkout "master"
git pull

for branch in $(local_branches); do
  if [[ "${branch}" != "master" ]]; then
    git checkout "${branch}"
    git pull
    git merge "master"
    git push origin "${branch}"
  fi
done

echo
[[ "${saved_branch}" != "$(current_branch)" ]] && git checkout "${saved_branch}"