On Linux systems, all file names are case sensitive. If you need to rename files from the command line, there are many ways to do it. For example, if you wanted to recursively make all files on a path lowercase, you could use:

find ./ -type f -exec rename 'y/A-Z/a-z/' {} \;

What this is doing is finding all files in the directory with find ./ -type f then executing the command rename 'y/A-Z/a-z/' on each one. This uses a regular expression to find all upper case characters and change them into lower case ones.

Though this might not be the best solution for your problem. It’s a bit unclear what has led to your issue. If you could tell us more about the software you are using and what you are trying to accomplish, we might be able to help you better.