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

    The current log file is the log file last established by a SET
    LOG command. By default, if you did not enter a SET LOG command,
    the current log file is the file SYS$DISK:[]DEBUG.LOG.

    Related commands:

       SET LOG
       SET OUTPUT [NO]LOG
       SET OUTPUT [NO]SCREEN_LOG