[buug] Unix script for replacing character in file or folder name?

[Gary Mielke]

I was wondering if anybody has a unix shell script that would replace a
specific character in a file or folder. I would like the script to look into
one directory and search all the sub folders and files and if it finds a ":"
colon character in any of the names that it would replace it with a "_"
underscore. Has anybody worked with a similar script that they would be
willing to share?

Thanks for any help or suggestions.

Gary