Qualifiers

/APPEND
   Controls whether CMS appends the command output to an existing
   file, or creates a new file. If you specify /APPEND and the output
   file does not exist, CMS creates a new file. If you do not provide
   an output file specification (see the description for /OUTPUT),
   the output is appended to SYS$OUTPUT.

/OUTPUT[=file-specification]
   Directs CMS to write output to the specified file, except for any
   warning and error messages, which are written to SYS$OUTPUT and
   SYS$ERROR. CMS creates a new file if you do not specify /APPEND.
   If you omit the /OUTPUT qualifier (or if you specify /OUTPUT
   but do not provide a file specification), CMS directs output to
   the default output device (SYS$OUTPUT). If you omit either the
   file name or the file type component, CMS supplies the missing
   component from the default specification.