Features of Unix File System
Hierarchical Structure
Permit grouping of associated information and efficient manipulation of these groups.
Dynamic File Growth
Files grow according to the need. A Disk space is not wasted because only the amount needed to store the current contents of the file is only used.
Structureless Files
There is no internal structure imposed on the content of the files. Any structure provided through the user could be used.
Security
An Unauthorized user can be restricted from using a file.
Device independent
Input and output from a device are processed as if it were in a file. Thus, programs which process data could also process data to and from a device.