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Part: V Appendixes > %envir% 4.0 and later—Internal

%envir% 4.0 and later—Internal

With the addition of the %envir% syntax in MS-DOS 4.0, users finally had access to variables in batch files. Before executing a line in a batch file, DOS replaces every occurrence of %envir% with the contents of the corresponding environment variable. When combined with the capability of the SET command to create and destroy environment variables, this feature can be very powerful.


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