Simple script to synchronize a forked repository.

syncgit.sh

#!/bin/bash

# save old state
BRANCH=$(git branch | awk '/^\*/ { print $2}')
STASH=$(git stash -u)

# update all remotes
git fetch --all

# update master
git checkout master
git merge upstream/master
git push

# update develop
git checkout develop
git merge upstream/develop
git push

# restore
git checkout ${BRANCH}
if [ "${STASH}" != "No local changes to save" ]; then
  git stash pop
fi

# merge develop in current branch
if [ "$BRANCH" != "master" -a "$BRANCH" != "develop" ]; then
  git merge upstream/develop
fi

# cleanup
git remote prune origin
git branch --merged | egrep -v "\*|master|develop" | xargs -n 1 git branch -d