If you need to clone a git repository you need to use the following command:

git clone git://git.kernel.org/pub/scm/bluetooth/bluez.git

To create a new repo from the scratch, first run:

git init

Then:

git add .

git commit

To create the initial git commit for this repo

To commit, after make your changes with your favorite editor do

git add file1 file2 file3 …

git commit

If you want to commit all the changes you made use

git commit -a

To check the changes before commit:

git diff

If you  pass the –stat option to ‘git diff’ you will see a summary of lines changed by file.

To see the commit list

git log

If you pass the -p option the diff of the commit will be shown as well. For other logs, like commit by developer you can use ‘git shorlog’

If you wanna update you local tree with the origin tree, then

git pull origin

This will automatically merge your local tree with the new commits from the origin tree.