/LOG
       /NOLOG

    Controls whether the EXCHANGE command COPY displays the file
    specifications of each file copied. If you specify /LOG, the
    system displays the following data for each copy operation:
    the file specifications of the input and output files, and the
    number of blocks or the number of records copied (depending on
    whether the file is copied on a block-by-block or record-by-
    record basis). The default is /NOLOG.