FILES:
 	plain, directory, character & block - along with links, sockets and pipes

    * Directories: files that are lists of other files.
    * Special files: the mechanism used for input and output. Most special files are in /dev, block or character
    * Links: a system to make a file or directory visible in multiple parts of the system's file tree. 
    * (Domain) sockets: a special file type, similar to TCP/IP sockets, providing inter-process networking protected by 
	the file system's access control.
    * Named pipes: act more or less like sockets and form a way for processes to communicate with each other, without 
	using network socket semantics.

The -l option to ls displays the file type, using the first character of each input line:


File types in a long list
Symbol	Meaning
-	Regular file
d	Directory
l	Link
c	Special file
s	Socket
p	Named pipe