Library /sys$common/syshlp/dbg$help.hlb DEBUG, SET, OUTPUT, Example  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  DBG> SET OUTPUT VERIFY,LOG,NOTERMINAL

      This command specifies that the debugger take the following
      actions:

      o  Output each command string that it is executing from a
         command procedure or DO clause (VERIFY)

      o  Record debugger output and user input in a log file (LOG)

      o  Not display output at the terminal, except diagnostic
         messages (NOTERMINAL)