Write brief notes on Ms-Dos and Unix?

Q Write brief notes on Ms-Dos and Unix?

Ans: 

Ms-Dos:

During the 1980s and early 1990s, Dos(Disk Operating System) was the dominant operating system for micro computers millions of copies of Dos have been sold to date, making it one of the most widely used software packages ever developed. Even though it has been made technologically obsolute by newer products, many of today's micro computer user still work with Dos.

             Dos is available in two forms PC-Dos(Personal Computers Disk Operating System) and Ms-Dos(Microsoft Disk Operating System) both were originally developed by microsoft corporation only minor difference separates these virtually identical operating system PC-Dos was designed for IBM microcomputers, whereas MS-Dos designed for a whole group or class of computers namely those said to be 'IBM PC compatible'. 

             Dos is a single user, single tasking operating system which is disk based. This operating system has a number of commands to make it user friendly. The command of Dos are divided in to the groups namely, Internal commands and external commands. Internal commands reside in memory whereas the external commands reside on disk and can be loaded when required.

Unix:

The unix operating system was first developed by Bell laboratories USA, in 1969 for 16-bit mini and micro computers. Unix has a number of impressive features which have given rise to its wide spread use. It is a full multitasking, multi-users time - sharing operating system written mostly in C, there by making it relatively easy to port from machine to machine. It has a sophisticated and powerful command interpreter, called the shell, which is designed for used by computer professionals. 

              Unlike other operating systems, such as windows 96,98 and xp which are based on inlet chips- unix is not built around  a single family of processor, computer systems from micro to mainframe can run unix and it can easily integrate a variety of deviced from different manufacture through network connections. This flexibility gives unix a big advantage over competing operating systems for many types of applications.