Git: Keep gh-pages branch up to date (sync) with the master branch

sync_gitbranch.sh

git add .
# see what changes are going to be commited
git status
git commit -m 'Some descriptive commit message'
git push origin master

# go to the gh-pages branch
git checkout gh-pages
# bring gh-pages up to date with master
git rebase master
# commit the changes
git push origin gh-pages
# return to the master branch
git checkout master