Unix File Types
For normal files in the file system, Unix does not impose or provide any internal file structure. This implies that from the point of view of the operating system, there is only one file type.
The structure and interpretation thereof is entirely dependent on how the file is interpreted by software.
Unix does however have some special files. These special files can be identified by the ls -l command which displays the type of the file in the first alphabetic letter of the file system permissions field. A normal file is indicated by a dash ('-').
Read more about Unix File Types: Regular File, Directory, Symbolic Link, Named Pipe, Socket, Device File, Door
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