Unix Operating system with its basic features

About UNIX:
Operating System is the system software that act as interface between computer hardware and application software. Ex: DOS, Windows, Unix etc.
Unix was originally developed in 1969 by a group of AT&T employees at Bell Labs, including Ken Thompson, Dennis Ritchie etc.

• Several people can use a UNIX computer at the same time; hence UNIX is called a multiuser system. 

•  A user can also run multiple programs at the same time; hence UNIX is called multitasking.

• Originally Unix written in assembly language but was recorded in 'C' afterwards.

• Although it is written in 'C' but it supports other languages like FORTRAN, Pascal, COBOL etc.

Features of UNIX:

1. Multiuser & Multitasking.

1. Treats everything as a file.

1. File Access permission.

1. Files can grow dynamically.

1. Hierarchical File structure:  Uses Hierarchical file structure to store information and it allows for easy maintenance and efficient implementation.

1. Good System Security.

1. UNIX shell: The shell is a command line interpreter; it translates commands entered by the user and converts them into a language that is understood by the kernel.

1. Pipes & Filters : Unix has a facilities called pipes and filters which permits the user to create complex program from simple.