Build VIROUS throuth ".BATCH" FILE

INTRODUCTION TO BATCH FILE

A batch file is a text file containing a series of commands intended to be executed by the command interpreter. When a batch file is run, the shell program (usually COMMAND.COM or cmd.exe, or Wscript.exe or cscript.exe) reads the file and executes its commands, normally line-by-line. Batch files are useful for running a sequence of executables automatically and are often used by system administrators to automate tedious processes.[1] Unix-like operating systems (such as Linux) have a similar type of file called a shell script.[2]
DOS batch files have the filename extension .bat. Batch files for other environments may have different extensions, e.g. .cmd or .bat in the Microsoft Windows NT-family of operating systems and OS/2, or .btm in 4DOS and 4NT related shells. The now-obsolete Windows 9x family of operating systems only recognize the .bat and .btm extension.


HISTORY OF BATCH FILE

Originally command interpreters' primary responsibility was to execute out commands entered manually. Such commands might involve starting programs, carrying out file operations, executing functions concerned with controlling the system, setting preferences or administrative tasks. Sequences of such commands were also sometimes stored in files, which could be later passed to the command interpreter to be read and executed, so such stored sequences could be termed sets of 'batch commands'.
Over time, command interpreters or 'shells' grew additional features, as such stored sequences of such 'batch commands' became more complex, and command interpreters evolved into something more akin to interpreters for a kind of limited programming languages or 'script'. Additional commands, advanced syntactic features and computation abilities were added which allowed sophisticated programs to be written so that batch files or scripts could contain a mixture of commands of the traditional.


Early influences

Microsoft DOS batch language was influenced by various Unix shells, as well as other text-based command line interfaces from the early 1980s such as CP/M which in turn took much of their inspiration from TOPS-10 and TOPS-20 from Digital Equipment Corporation. Although a DOS batch file is analogous to a shell script in Unix-like operating systems, the syntax and range of commands available is less sophisticated.


DOS
The first example of Microsoft's batch files were the .bat files used by DOS. The operating system used COMMAND.COM to process commands and batch files. Commands were either internal (part of COMMAND.COM), or if they were too large to keep in the main file; external, where COMMAND.COM would look for the command each time it is requested at the prompt (or display an error message if it didn't exist). This meant that if one wanted, they could add commands to DOS, and in turn allow more functionality to batch files when using the new commands.
An example of an important batch file was AUTOEXEC.BAT which automatically runs after DOS loads during booting. It typically had commands to load drivers.


Filename extensions

".bat" : The first extension used by Microsoft for batch files. This extension can be run in most Microsoft Operating Systems, including MS-DOS and most versions of Microsoft Windows.

".cmd" : Designates a Windows NT Command Script, which is written for the Cmd.exe shell, and is not backward-compatible with COMMAND.COM.

".btm" : The .btm file extension is used by 4DOS and 4NT rather than Command Prompt or COMMAND.COM. This non-Microsoft Filename extension when used with larger scripts is faster than .cmd or .bat scripts because it is all loaded at once into one command, rather than line-by-line (as it is done with .bat and .cmd extensions)


Differences

The only known difference between .cmd and .bat file processing is that in a .cmd file the ERRORLEVEL variable changes even on a successful command that is affected by Command Extensions (when Command Extensions are enabled), whereas in .bat files the ERRORLEVEL variable changes only upon errors.


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