Set `xhost +` to run automatically on startup/login?

Right, I just meant viewing the file to check what the defaults are,
not editing it.


Although that just made me realize I don’t actually know for sure:

What happens if you created a new file like eg
/etc/foo.config
not knowing that there was already a file like eg
/usr/etc/foo.config
?

Is there a standard behavior where the one under /etc/ takes precedence over the one in /usr/etc/ or something?
(Or is there at least generally supposed to be a standard behavior?)

Or does it just kinda depend on the specific program or whatever?