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DOS and Batch Files

Rename All Files From One Extension to Another

SUMMARY: Quickly change the extension of all files in a directory.

(Note that this may not work on early versions of DOS, so experiment.)

If you ever need to rename all files in a directory from one extension to another, for example, *.new to *.old, you can use wildcards with the rename command. In this example, the command would be:

rename *.new *.old

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