Etckeeper is a set of Linux server tools that lets you keep your /etc directory (and all the configuration files under it) in a revision control system. It hooks into apt (and other software package managers including yum and pacman-g2) to automatically commit changes made to /etc during package upgrades. The advantage of etckeeper is that it's designed specifically for tracking /etc, including the file permissions and metadata that the revision control systems do not track.
Learn more about etckeeper in this ServerWatch.com article.
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