VMS Help MERGE, Output File Qualifiers, /OVERLAY, Example  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  $ CREATE/FDL=NEW.FDL AVERAGE.DAT
  $ SORT/KEY=(POS:1,SIZ:80) STATS.DAT AVERAGE.DAT/OVERLAY

      The FDL file NEW.FDL specifies special attributes for the
      file AVERAGE.DAT. When Sort writes output to that file, the
      resulting Sort output file has the attributes specified by the
      FDL file.