.bashrc

export GIT_PS1_SHOWDIRTYSTATE=1 GIT_PS1_SHOWSTASHSTATE=1 GIT_PS1_SHOWUNTRACKEDFILES=1
export GIT_PS1_SHOWUPSTREAM=verbose GIT_PS1_DESCRIBE_STYLE=branch GIT_PS1_SHOWCOLORHINTS=1
 
if [ "$color_prompt" = yes ]; then
PS1='${debian_chroot:+($debian_chroot)}\[\033[01;32m\]\u@\h\[\033[00m\]:\[\033[01;34m\]\w$(__git_ps1) \[\033[00m\]\$ '
else
PS1='${debian_chroot:+($debian_chroot)}\u@\h:\w$(__git_ps1) \$ '
fi
unset color_prompt force_color_prompt

README.txt

1° sudo apt-get install git-core

2° dans .bashrc ajouter $(__git_ps1)  dans le prompt, et setter quelques variables