8.18
DirName
| (require dirname) | package: dirname | 
procedure
pth : (listof path-string?) 
Example:
> (dirnames "/home/user/Downloads") '("/home/user/" "Downloads")
procedure
pth : path-string? 
Example:
> (dirname "/home/user/Downloads") "/home/user/"
procedure
pth : path-string? 
Example:
> (basename "/home/user/Downloads") "Downloads"