IF "%2%" = "" THEN
  READ/1/P Enter the name of the file you want duplicated: ;
ELSE
  STRING/1 %2%
ENDIF
IF "%1%" = "" THEN
  READ/2/P Enter the name you want the duplicate file called: ;
ELSE
  STRING/2 %1%
ENDIF
COPY %S/2% %S/1%
WRITE Done duplicating %S/1% to %S/2%.