The basic steps for using git in debian/ubuntu

1. install a git server & initialize a repository

install git-core

$ apt-get install git-core

check the path of git-shell

$ which git-shell
/usr/bin/git-shell

add some users which can access the git server via the git-shell

$ sudo useradd -m -s /usr/bin/git-shell git
$ sudo passwd git
(you can add more users as above)

initialize a git repository: foo

$ sudo mkdir /home/git/foo
$ cd /home/git/foo
$ git --bare init
$ sudo chown -R git:git /home/git/foo

first commit(create the master branch)

$ mkdir foo
$ cd foo
$ git init
$ touch README
$ git add README
$ git commit -m "added README"
$ git remote add origin git@localhost:/home/git/foo
$ git push origin master
$ cd ..; rm -rf foo

2. using git as a client

firstly, you also need to install git-core

$ sudo apt-get git-core

clone the repository from the git server

$ git clone git@your-git-server:/home/git/foo

do a little configuration

$ cd foo
$ git config --global user.name "git"
$ git config --global user.email "git's email"

upgrade(synchronization)

$ git pull

add a new file or directory

$ touch file
$ git add file

add some comments to the above operation

$ git commit -a -m "some comments here..."

submit your operation to the git server

$ git push

that's all, have fun :-)

References & Links

[1] Remote Git Repos on Ubuntu: The Right Way
http://blog.drewolson.org/2008/05/remote-git-repos-on-ubuntu-right-way.html
[2] Installing Git on a server (Ubuntu or Debian)

[3] Hosting Git repositories, The Easy (and Secure) Way
http://scie.nti.st/2007/11/14/hosting-git-repositories-the-easy-and-secure-way