## Exercise 6

 1. Write a script that renames each file in the current directory to only use
    minuscule letters. E.g. ‹IMG_32.jpg› would be renamed to ‹img_32.jpg›.
 2. Create some test files and run the script to check it works.
 3. Hint: try the following command:
    
        $ echo Hello W0rLD | tr A-Z a-z

