Qualifiers used in a Sort/Merge specification file are similar
    to the DCL qualifiers used in the SORT or MERGE command line.
    However, in some cases, the format of these qualifiers can be
    different. For example, the /KEY qualifier at DCL level has a
    different format than the /KEY qualifier in the specification
    file.

    If you specify DCL command qualifiers in the SORT or MERGE
    command line, those qualifiers override corresponding entries
    in the specification file.

    High-performance Sort/Merge: The high-performance Sort/Merge
    utility does not currently support the use of specification
    files.