Introduction to UNIX
UNIX is one of the time sharing operating systems primarily intended for program development and document-preparation environment. The first version of UNIX was written by Ten Thompson, later joined by Dennis Ritchie. It was a single user system written for the PDP-7 computer written in assembly language. Several specialized versions of UNIX, such as the programmer's Workbench, UNIX/ PWB and Writer's Workbench, UNIX/WWB are also available.
Some of the major features of UNIX are the following:
- Hierarchical file system.
- Device Independence.
- Multi-user operation.
- Tools and tool-building utilities.
- In 1985 the first version of Windows was released in market.
- iPod, iPhone, and iPad all are developed by Apple.
- Steve Jobs established Apple in April 1976.
- Multiprocessing: It supports in running a program on multiple CPUs.
- Multitasking: Generally it allows more than one program to run at the same time.
- Multi-user: It allows more than one user to run the program at same fraction of time.
- Multithreading: It permits all different modules of a single program to run at the same time.
- Real-Time: Its responds to input immediately.
- The outermost layer of OS is called user interface and innermost layer is hardware. v OS is a master control program.
- UNIX is one of the time sharing operating systems.
- An OS (Operating System) developed by Tim Peterson of Seattle Computers was refined for the first version of MS-DOS.
- The first version of UNIX was written by Ten Thompson, later joined by Dennis Ritchie.
- The latest version of MS-DOS available in market is 7.x.