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How to Access Environment Variables in an MS-DOS Batch FileView products that this article applies to.function loadTOCNode(){}Article ID:121170Last Review:September 30, 2003Revision:3.0This article was previously published under Q121170SUMMARYloadTOCNode(1, 'summary');
The article explains how you can access environment variables within MS-DOS
batch files.
MORE INFORMATIONloadTOCNode(1, 'moreinformation');
The following example shows how to test for the existence of an environment
variable:
IF "%VARIABLE%" == "" GOTO MODULE
This example checks for the existence of the environment variable
"VARIABLE." If VARIABLE does not exist, the statement is true and control
of the batch file jumps to the MODULE section. If the statement is not
true, that is, the VARIABLE variable does exist, program control skips to
the next line of the batch file and continues.
NOTE: The quotation marks are necessary only when a variable is used in a
logical IF statement.
The following example illustrates the use of the PATH environment variable
within a batch file:
IF "%PATH%" == "" GOTO NOPATH
:YESPATH
@ECHO The PATH environment variable was detected.
PATH=C:\DOS;%PATH%
GOTO END
:NOPATH
@ECHO The PATH environment variable was NOT detected.
PATH=C:\DOS;
GOTO END
:END
This example tests for the existence of the PATH variable. If it exists,
control passes to the YESPATH section; otherwise, control is passed to the
NOPATH section.
If a path is detected and control is passed to the YESPATH section, C:\DOS
is added to the existing path by using the %PATH% variable.
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