fosrk-sync.sh

# Go to master branch (if needed)
git checkout master

# Look around
git remote -v

# Add upstream repo of the fork (if needed)
git remote add upstream <ssh-or-https-url-to-original-repo>

# Look around again
git remote -v

# Get latest version of repo
git fetch upstream

# Merge original repo into forked repo (locally)
git merge upstream/master

# Merge master to dev-branch
git checkout <my-dev-branch>
git merge master