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. |