Etc need updating gentoo
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It describes how to interactively merge current and new config files, edit new config files, examine differences between files, and more.
, all listed configuration files will be overwritten with the newer versions.
If your memory is not that good you should note down on a piece of paper every config file you modify under /etc/, so you will know if a given file has been edited by you or not when using etc-update.
There are equivalent tools, like dispatch-conf, which have more functionality.
It is beyond the scope of this guide to assist with that. You can use any boot medium that gives you access to your hard drive, allows you to chroot, includes mirrorselect, and supports bash.