This script will loop through all files and folders recursively and make them lower case. Please do not just blindly run this against your intended directory. The echo is there for testing and once you know that works then use the mv command

You can perform any command you’d like after the tr. In my case it’s replace all upper case letters with lower case ones.

If you don’t include the if statement, you’ll get a warning message if it tries to rename to the same case, so that keeps the console clean.

find /home/buschm3/bananas -depth -name '*' -print0 |
while IFS= read -r -d '' src; do
    dst=`dirname "${src}"`/`basename "${src}" | tr '[A-Z]' '[a-z]'`
    echo "$src"
    echo "$dst"
    if [ "${src}" != "${dst}" ]
    then
        #mv "$src" "$dst"
    fi
done