etckeeper is a collection of tools to let /etc be stored in a git, mercurial, darcs, or bzr repository. It hooks into apt (and other package managers including yum and pacman-g2) to automatically commit changes made to /etc during package upgrades. It tracks file metadata that revison control systems do not normally support, but that is important for /etc, such as the permissions of /etc/shadow. It's quite modular and configurable, while also being simple to use if you understand the basics of working with revision control.
etckeeper installation:
Open your terminal and type following command to install etckeeper:
Continue Reading... etckeeper installation:
Open your terminal and type following command to install etckeeper:
sudo apt-get install etckeeper
source:http://linuxpoison.blogspot.com/2011/06/135781677512073.html