DeleteDirectory

DeleteDirectory["dir"] deletes the specified directory.

DeleteDirectory["dir", DeleteContents -> True] deletes dir and all files and directories that it contains.

DeleteDirectory["dir"] deletes the directory dir only if it contains no files.

DeleteDirectory returns Null if it succeeds in deleting a directory, and $Failed if it fails.

See The Mathematica Book: Section 2.11.6.

See also: CreateDirectory, DeleteFile.