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   rename

   Usage
   #include <stdio.h>
   int rename (const char *oldname,const char *newname);

   Description
   Changes  the name of a file from oldname to newname. Both oldname  and
   newname may contain drive and path names but both names must refer  to
   the same drive.

   Example
   #include <stdio.h>
   #include <io.h>
   main()
   {
   int return_code;
   char *oldname,*newname;
        oldname = "data.fil";
        newname = "file.dat";
        return_code = rename(oldname,newname);
        printf("\n%s %s renamed to %s\n",oldname,
        return_code == 0 ? "was" : "was not",newname);
   }

   Return Value
   rename returns a 0 if the file name was successfully changed and  non-
   zero if it was not and errno is set.