Introduction
Batch file programming is the native programming offered by the Microsoft Windows Operating
System. Batch file is created using any text editors like notepad, WordPad, WinWord or so on, which
comprises of a sequence of built-in commands used to perform some often done tasks like deleting a
series of files of same type or of different type, creating logs, clearing unwanted craps from your
computer and even for creating a batch VIRUS.
Whenever a Batch program is executed, it was interpreted line-by-line by the CLI (Command
Line Interpreter) command.com or the cmd.exe. Batch file is really helpful in automating tedious tasks
and for maintaining system logs. The commands used while creating a batch file are case insensitive, in
the sense that it may accept both small and upper case letters.
Modes:
There are two different modes that are supported by DOS (Disk Operating System), they were,
1. Interactive Mode.
2. Batch Mode (Silent Mode).
Interactive mode:
In interactive mode, when a command is executed, it interacts with the user for input and
depending upon the input supplied by the user, the further processes are carried out. For example, let’s
take the ‘del’ command.
The ‘del’ command is used for deleting files that reside inside a directory. Now I am going to
delete all the files inside a folder named ‘a’, and when I executed the following command, it is interacting
with me prompting “Are you sure (Y/N)?”, confirming the deletion operation, and depending upon my
input, it decides what to do. If I hit ‘Y’ then it will delete the files specified, else if I hit ‘N’ then it won’t
delete.
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C:\>del a
C:\a\*, Are you sure (Y/N)? y
Batch Mode:
Batch mode can also be referred as ‘Silent mode’or ‘Quiet Mode’, and this is mere opposite to
the interactive mode. The command that operates at batch mode will never interact with the user at any
instance, instead it will take care of every operation by itself.
For example, I am going to explain this by using the same ‘del’command. There is a switch available for
the ‘del’ command, which makes the command to operate at silent mode, and that switch is ‘/Q’
C:\>del /Q a
C:\>
In this case, the command is not at all interacting with me, whether to delete those file or not.
In the above example, I have tried to delete the same files in the same folder by using the same command
but with a different switch. Anyhow both the commands will perform the same operation but the mode it
operates differs.
How to create a Batch Program:
As said earlier, batch programs can be written using any of the text editors such as notepad,
wordpad and so on, but notepad is the most often used text editor in such cases. Like any other
programing languages, lets start our first program with the ‘Hello World’program.
1. Open up a notepad and type the following.
@echo off
Echo Hello World
pause
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2. Save the file with any name you wish, but make sure that you save the file extension with .bat, in
this case I am saving this file as ‘first.bat’.
3. When you save the batch file, then the icon becomes like the below icon,
In Windows XP, the Batch file icon looks like above, where as in Windows Vista the Icon looks like the
below image,
4. Just double click to execute the batch file that you have created now. And the output looks like,
5. You are done!
Let me explain what does the above given program does,
‘echo’is the command used to print text on the screen, so whatever that follows the echo
command will be displayed on the output screen. This command is just like the ‘printf’statement in the C
language.
When you type the echo command alone, then it will tell you whether the ‘echo is ON’ or ‘echo is OFF’.
It’s always recommended to turn the echo off, else it will display the prompts like (C:\>) and so on. In
order to avoid the prompts being displayed, the echo is turned off by using the command “@echo off”or
simply by using the “echo off”.
“Echo Hello World”will display the “Hello World” on the output screen, and the pause command is used
to wait for the user interaction, whether to proceed further or not. If the pause is not used, then the batch
will terminate immediately after displaying the “Hello World”.
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