Tip 1:
Configuration files in home directory override system-wide settings (may be restricted though).
Tip 2:
Mostly every man page has FILES section where you can see what configuretion files are used for given application. Below is a snippet from man mc:
Quote:
/usr/share/mc/mc.ext
The default system-wide extensions file.
~/.mc/bindings
User’s own extension, view configuration and edit configuration
file. They override the contents of the system wide files if
present.
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