## Exercise 7

 1. Write a script that, for each file in the current directory,
    moves and/or renames files like this:
    
     ◦ ‹example_file.txt› becomes ‹example/file.txt›,
     ◦ ‹bar.txt› stays unchanged,
     ◦ ‹some_longer_name.sh› ends up as ‹some/longer/name.sh›.

 2. Create any directories that are missing.
 3. Try the following commands:
    
        $ echo some_longer_name.sh | sed -e s,_,/,g
        $ dirname some/longer/name.sh
