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What you need to understand as far as calibredb is concerned is that you need to pass either of the two following forms of command line arguments to it
*One* argument of the form
-fwhatever
or *Two* arguments of the form
-f whatever
These are exactly equivalent.
Now remember that bash splits command line arguments at spaces, unless you surround them in quotes, in which case they become one argument.
With that in mind you should be able to understand the results you are getting.
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