I did it. It created a new folder in the eBooks/<author> folder with the title of the book (3). I did not realize it, so I opened Calibre, and the book appeared in the library. I then removed the book, and ran the command again. This time, it created it with (4). So, the Command appears to have done the same thing that would have occurred if I had used the Add Book command in Calibre (the book gets added to the Library and a duplicate folder and file gets created.
Here is the Terminal Output:
iMac:~ Chris$ calibredb add "Documents/eBooks/Robert B. Parker/Early Autumn (2)/Early Autumn - Robert B. Parker.mobi"
CPG-iMac:~ Chris$ calibredb list
idtitle authors
4 Early Autumn Robert B. Parker
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