Don't underestimate capacity of ignorant newb to be confused
I know what I am hoping to achieve with this specified location of metadata.db, just don't know how to do it
(sorry) - clearly senior moment...
I have moved metadata.db from original library location to local directory as specified in the script and it all seems to be happy!
BTW interesting thing:
when installed, calibre creates /opt/calibre directory
unless I change it to /opt/Calibre the message I get when trying to run it - there is no calibre file or directory (or something to that effect)