Qualifier

/OUTPUT
      /OUTPUT=filespec

   Writes all output to the file or device specified. By default,
   the output is written to the current SYS$OUTPUT device and the
   output file type is .LIS. System responses and error messages
   are written to SYS$COMMAND as well as to the specified file. If
   you specify /OUTPUT, the qualifier must immediately follow the
   CALL command. The asterisk (*) and the percent sign (%) wildcard
   characters are not allowed in the output file specification.

   You can also redefine SYS$OUTPUT to redirect the output from a
   command procedure. If you place the following command as the
   first line in a command procedure, output will be directed to the
   file you specify:

   $ DEFINE SYS$OUTPUT filespec

   When the procedure exits, SYS$OUTPUT is restored to its original
   equivalence string. This produces the same result as using the
   /OUTPUT qualifier when you execute the command procedure.