Description: Achieve the specified directory and its subdirectories in the search for the file name extension, and to update the extension for the new program features reext procedure: 1. Procedures with the three command-line parameters dir, old and new, use for: reext dir old new one of Dir is a full path name, old and new are file extensions, such as: Reext c: \ ASM \ TEST txt doc 2. Procedures for the implementation of the function: in the path of Dir in the search for a file extension of all the txt file, if found, will be replaced by the extension doc, and the file name the same: 3. Higher requirements, you can search all the subdirectories of the specified directory, which required implementation recursive procedures.
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rename.txt