/sys$common/syshlp/helplib.hlb JOB, Qualifiers, /LOG_FILE  *Conan The Librarian (sorry for the slow response - running on an old VAX)

       /LOG_FILE=filespec
       /NOLOG_FILE

    Controls whether a log file with the specified name is created
    for the job or whether a log file is created.

    When you use the /LOG_FILE qualifier, the system writes the
    log file to the file you specify. If you use the /NOLOG_FILE
    qualifier, no log file is created. If you specify neither form of
    the qualifier, the log file is written to a file in your default
    directory that has the same file name as the first command file
    in the job and a file type of .LOG. Using neither the /LOG_FILE
    nor the /NOLOG_FILE qualifier is the default.

    You can use the /LOG_FILE qualifier to specify that the log file
    be written to a different device. Logical names that occur in
    the file specification are translated at the time the job is
    submitted. The process executing the batch job must have access
    to the device on which the log file will reside.

    If you omit the /LOG_FILE qualifier and specify the /NAME
    qualifier, the log file is written to a file having the same
    file name as that specified by the /NAME qualifier and the file
    type .LOG.