- Follow the XDG standards for overriding core OS files. The `/etc`, `/var`, `/usr/local`, and `/opt` directories are writable, and many applications will look here for overrides of the read-only files shipped with the OS image in `/usr`. Add to this your home directory, which contains the `~/.local` and `~/.config` subdirectories, which often allow per-user overrides of system defaults. When you’re [using your UNIX system correctly](https://www.youtube.com/watch?v=JOeY07qKU9c), the read-only part is invisible!
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