Command PromptChapter 10

Introduction to Batch Files

Richard Goldman

February 7, 2000

Batch File• A batch file is an ASCII text file that contains a

list of commands that the operating system can execute.

• A batch file must end with a .BAT extension.• A batch file is run by entering its name at the

command prompt.• A batch file may be interrupted by pressing

[Ctrl] + C

or

[Ctrl] +[Break].

Creating a Batch File

• Batch files can be written with any word processor or editor that can save files in ASCII text format.

• The MS DOS editor if often used while in DOS for working with batch files.

• You may also use theCOPY CON [filename.bat]

to write simple BAT files.

Batch file Commands• Call – Calls another batch file• CHOICE – Pauses file and asks user to enter a

response to a question. (Not available in Win 2000)• ECHO – Displays or hides text.• FOR – Runs a command for files in a set.• GOTO – Directs flow to specified label.• IF – Conditional processing.• PAUSE – Temporally stops processing.• REM – Used to document batch file.• SHIFT – Shifts replaceable parameters

REM Command

• Used to document a batch file.

• No action will be taken on lines that start with a REM statement.

Replaceable Parameters

• Allows users to enter variables at the command prompt that the batch file can use.

• You can reference parameters 1-9 (0 is the position of the command).

• Substitute % followed by the entry order number of the parameter.

• Example: %3

AUTOEXEC.BAT File

• The AUTOEXEC.BAT file is automatically run after the system is booted in Win 9X.

• Not used with NT Operating Systems.

• The system looks for it in the root directory.

End