Git is a famous distributed version control system.

Preparation

git config --global user.name "Your Name"
git config --global user.email you@example.com

Initialize

git init

Add remote repo

git remote add origin git@github.com:username/repo.git

Add files to staging area

git add .

Record a new permanent snapshot

git commit

You can use -m to specify the comment.

git commit -m "Update xxx file."

Use --allow-empty-message to make an empty comment.

git commit --allow-empty-message -m ""

Push

git push origin master

Pull

git pull origin master