Library /sys$common/syshlp/helplib.hlb
EXCHANGE, COPY, Qualifiers, /TRUNCATE
 *Conan The Librarian 

       /TRUNCATE
       /NOTRUNCATE

    Controls whether COPY truncates an output file at the end-of-
    file when copying it. The default is /NOTRUNCATE; COPY uses the
    allocation of the input file to determine the size of the output
    file.
  Close     Help