[daniel1212]

" sed is great at replacing characters like that. "

You mean Stream EDitor (sed) Thanks. Again, the issue is figuring out what coding is needed/will work to find and change the case on just the links in a specific folder and its subfolders. I will keep looking and reading.

[rightwingcrazy]

You might take a look at this article:
https://www.datasciencebytes.com/bytes/2014/11/13/using-sed-to-make-specific-text-lowercase-in-place/

I thing it will get you close; you just have to adjust the regular expression in the command string to your requirements.

[ShadowAce]

sed 's/[A-Z]/\L&/g'

The above is the command to change text to lower case.