Once I get it working I will post the code which may help others who follow me.
As stated above, it was very simple once I knew where to look. Since I still have not been able to get the ‘Joe’ editor working, I used the ‘vi’ editor to create a file called ‘rc.local’ in the ‘/share/flash/data/unslung’ directory. In my case running unslung 6.8 and with the USB drive in Drive 2, this diversion script will only be run with the USB drive plugged in.
The actual script was exactly as stated above:
Thanks again to those in the forum who pointed me in the right direction.