You can define a symbol to make invoking the SQL module processor
    easier. For example:

    $ SQLMOD == "$SQL$MOD"

    You then can invoke the SQL module processor with or without a
    module file specification:

    o  If you invoke the SQL module processor without a module file
       specification, the module processor prompts you for it. For
       example:

       $ SQLMOD
       INPUT FILE> module-file-specification

    o  If you invoke the SQL module processor with a module file
       specification as part of the DCL command line, SQL starts
       processing your module file immediately after you press the
       Return key. For example:

       $ SQLMOD module-file-specification

    Either way, there are several qualifiers you can specify with
    the file specification that control how SQL processes the module
    file. The syntax diagram shows the format for those qualifiers.