Which of the following is the first operating system developed using the C programming language?

By: Prof. Dr. Fazal Rehman | Last updated: February 3, 2024

Question:  Which of the following is the first operating system developed using the C programming language?

A  Windows 95

B  UNIX

C  MS-DOS

D  LINUX

Answer: UNIX

UNIX Description
Developer ·        Ken Thompson

·        Dennis Ritchie

·        Others at Bell Labs (now AT&T Labs)

Initial Release ·        1971
Type ·        Multitasking operating system
Kernel ·        Monolithic kernel (original Unix)

·        Variations include microkernels

Programming Language ·        Primarily written in C, with some assembly language components
Platform ·        Originally developed for the PDP-7 and PDP-11 minicomputers

·        Later versions for various hardware platforms

Licensing ·        Originally distributed without formal licensing; various Unix-like systems have different licenses
File System ·        Hierarchical file system with a root directory (/) and various subdirectories
Shell ·        Bourne shell (sh)

·        C shell (csh)

·        Bourne-Again shell (bash)

User Interface ·        Command-line interface (CLI)

·        Graphical user interfaces (GUIs) also available on Unix-based systems

File Permissions ·        Unix uses a robust permission system with read, write and execute permissions for users, groups and others
Processes ·        Supports multitasking, allowing multiple processes to run concurrently
Networking ·        Unix was instrumental in the development of the TCP/IP protocol, forming the basis of the internet
Notable Variants ·        Various Unix-like operating systems, including Linux, macOS (based on Darwin) and AIX
Contributions ·        UNIX has had a profound influence on the development of modern operating systems and software development practices.
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