I represent a Unix FileDirectory.

	private
	setPathName:

	testing
	directoryExists: fileOrDirectoryExists:

	file names	top
	fullPathFor: Return the fully-qualified path name for the given file.

	private	top
	setPathName: Unix path names start with a leading delimiter character.

	testing	top
	directoryExists: Handles the special case of testing for the root dir: there isn't a possibility to express the root dir as full pathname like '/foo'.
	fileOrDirectoryExists: Handles the special case of testing for the root dir: there isn't a possibility to express the root dir as full pathname like '/foo'.

	platform specific	top
	maxFileNameLength
	pathNameDelimiter return the active directory class's directory seperator character