Cfg-update

is Article description::a utility used on Gentoo to manage configuration file updates. It allows system administrators to review then accept or reject upstream configuration changes, which frequently happens when packages are updated. It is has an integrated backup system which does not require an external version control system.

dispatch-conf is another utility for managing configuration file changes, and is provided as part of Portage.

Configuration
Configuration is done through. The most common option users need to change is the MERGE_TOOL option to the preferred merge tool of the system. Supported tools include meld, xxdiff, kdiff3, gvimdiff, tkdiff, vimdiff, sdiff and imediff2.

Invocation
must be run as the root user. The first time it runs, it creates a portage hook to update its index and will remind of running the update command.

To update system files: