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Basic DOS Commands

Basic DOS Commands

MS-DOS is a trademark of Microsoft Crop. Unix is a trademark of AT&T; Bell Laboratories. VAX is a trademark of Digital Equipment Corp. IBM PC is a trademark of International Business Machines Corp.To use SST on an IBM Personal Computer (or compatible), it helps to know a little about the disk operating system (DOS) used on the IBM PC. The best reference is your DOS manual (supplied with your computer), but we will review a few simple commands here. SST requires version 2.0 or higher of PC-DOS or MS-DOS.

DOS (Disk Operating System) was the first widely-installed operating system for IBM-compatible personal computers. DOS is a non-graphical line-oriented command-driven computer operating system. It has a relatively simple–but not overly “friendly”–user interface.

The earliest versions of the Microsoft Windows operating system were really just applications that ran on top of the MS-DOS operating system. Modern versions of Windows (Windows 95 and greater) no longer run on top of DOS, but do retain a DOS-like user interface called the “MS-DOS Prompt” or “Command Prompt”. The command prompt allows Windows users to issue DOS commands to the system.

DOS commands are useful to Windows users for a variety of reasons. Many tasks that can be performed in the Windows graphical environment can be performed much more quickly and efficiently by utilizing DOS commands. Also, most bootable floppy disks will boot the system directly to a DOS environment.


Users of any Windows system can invoke a command prompt by performing the following steps:

  1. Click Start.
  2. Select Run.
  3. In the “Open:” field, typecommand.
  4. Click OK.

A command prompt window is generally white or gray text on a black background. The prompt itself usually takes the following form:


where “X” represents the letter of the active drive, and “PATH” refers to the present working directory. Here’s an example of how a DOS command prompt commonly looks:


Command Prompt window

Commands are typed and echoed to the screen at the cursor’s location. Usually commands consist of a keyword, followed by optional flags, followed by a path. More will be explained about syntax and additional flags under each specific command.

What is C Language ?

What is C Language ?

C is a middle level programming language. It is developed by Dennis Ritchie at Bell Labs in the 1970. C Develop for use with the UNIX operating system.C was designed for implementing system software; it is also widely used for developing portable application software. It is widely used on many different software platforms, and there are few computer architectures for which a C Compiler does not exist.

C has greatly influenced many other popular programming languages, most notably C++, which originally began as an extension to C.C is one of the most popular programming languages of all time. C is also called about Mother Language.

Features of C language

  • It is a robust language with rich set of built-in functions and operators that can be used to write any complex program.
  • The C compiler combines the capabilities of an assembly language with features of a high-level language.
  • Programs Written in C are efficient and fast. This is due to its variety of data type and powerful operators.
  • It is many time faster than BASIC.
  • C is highly portable this means that programs once written can be run on another machines with little or no modification.
  • Another important feature of C program, is its ability to extend itself.
  • A C program is basically a collection of functions that are supported by C library. We can also create our own function and add it to C library.
  • C language is the most widely used language in operating systems and embedded system development today.

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