[mythtv-users] How does mythtv-setup assign the tv_grab script?

[Ralph]

While running mythtv-setup, you're asked to select your location, so 
that MythTV knows which tv_grab script mythfilldatabase has to call - 
eg. choosing 'Australia' somehow instructs mythfilldatabase to use 
the tv_grab_au script instead of any of the other tv_grab scripts available.

I'd like to know exactly how this works - or more specifically, how 
can I select a different tv_grab script from the command line, ie. 
without running mythtv-setup again. What would I need to edit manually? 
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