Just follow the UNIX way. Many application/programs use the first config file they find, in the following order:

• The one given as a command line argument.
• The one given in an environment variable.
• Fixed name in the current directory.
• Fixed name in the users home directory.
• One or more fixed paths (fixed paths can often be set at compile time).
• Compiled in defaults.

Not all applications use all points, for instance, many applications will not look in the current directory (unless pointed to by the first two options) - but an editor like vi does.

I tend to follow that strategy myself as well when writing applications.

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