• http://www.siteduzero.com/informatique/tutoriels/gerez-vos-codes-source-avec-git
• http://www.pierreschambacher.com/blog/git-in-a-nutshell/
• http://tutoriels.itaapy.com/wiki/tutoriel-git/
• https://help.github.com/articles/set-up-git

$ mkdir Git
$ cd Git
$ git config --global user.name jehanproc
$ git config --global user.email my.mail@int-evry.fr
$ git config --global color.diff auto
$ git config --global color.status auto
$ git config --global color.branch auto
$ git init
Initialized empty Git repository in /mci/mci/login/Git/.git/
$ cat ~/.gitconfig 
[user]
	name = jehanproc
	email = my.mail@int-evry.fr
[color]
	diff = auto
	status = auto
	branch = auto

$ git status
# On branch master
#
# Initial commit
#
nothing to commit (create/copy files and use "git add" to track)

$ vim file1.txt

$ git status
# On branch master
#
# Initial commit
#
# Untracked files:
#   (use "git add <file>..." to include in what will be committed)
#
#	file1.txt
nothing added to commit but untracked files present (use "git add" to track)


$ git add file1.txt

$ git status
# On branch master
#
# Initial commit
#
# Changes to be committed:
#   (use "git rm --cached <file>..." to unstage)
#
#	new file:   file1.txt

$ git commit -m "add initial file1.txt" 
[master (root-commit) b679adb] add initial file1.txt
 1 files changed, 1 insertions(+), 0 deletions(-)
 create mode 100644 file1.txt

$ git status
# On branch master
nothing to commit (working directory clean)

$ vim file1.txt 

$ git status
# On branch master
# Changes not staged for commit:
#   (use "git add <file>..." to update what will be committed)
#   (use "git checkout -- <file>..." to discard changes in working directory)
#
#	modified:   file1.txt
#
no changes added to commit (use "git add" and/or "git commit -a")

$ git diff 
diff --git a/file1.txt b/file1.txt
index ce01362..94954ab 100644
--- a/file1.txt
+++ b/file1.txt
@@ -1 +1,2 @@
 hello
+world

commit -a = commit de toutes les modifications .

$ git commit -a -m "modification de file1.txt -> +world"
[master 9058851] modification de file1.txt -> +world
 1 files changed, 1 insertions(+), 0 deletions(-)

$ git status
# On branch master
nothing to commit (working directory clean)

$ git log
commit 9058851ef6738163117ada54a94dbfc04365061c
Author: jehanproc <my.email@int-evry.fr>
Date:   Tue Apr 9 10:01:05 2013 +0200

    modification de file1.txt -> +world

commit b679adb3b2e2fa5e30d1f52b2fa4f12cff888b66
Author: jehanproc <my.email@int-evry.fr>
Date:   Tue Apr 9 09:51:01 2013 +0200

    add initial file1.txt

$ git reset --hard HEAD^
HEAD is now at b679adb add initial file1.txt

$ cat file1.txt 
hello

par defaut, une seule branche *master*

$ git branch
* master

creation d'un branche *option1* , ne modifie en rien les fichiers (pas de recopie)

$ git branch option1

$ git branch
* master
  option1

$ ls -al
total 52
drwxr-xr-x   3 login mci  4096  9 avril 10:11 .
drwx--x--x 225 login mci 36864  9 avril 10:11 ..
-rw-r--r--   1 login mci     6  9 avril 10:11 file1.txt
drwxr-xr-x   8 login mci  4096  9 avril 10:11 .git

passage sur la branche option1

$ git checkout option1
Switched to branch 'option1'

$ git branch
  master
* option1

$ ls -al
total 52
drwxr-xr-x   3 login mci  4096  9 avril 10:11 .
drwx--x--x 225 login mci 36864  9 avril 10:11 ..
-rw-r--r--   1 login mci     6  9 avril 10:11 file1.txt
drwxr-xr-x   8 login mci  4096  9 avril 10:28 .git