command-string
    Specifies the DCL command line to be executed. If you do not
    specify a command string, LSE uses the command string specified in
    the definition of the language associated with the current buffer
    (see the DEFINE LANGUAGE/COMPILE_COMMAND command).

    If you specify a dollar sign ($)  as the first argument on
    the COMPILE command, LSE replaces the dollar sign with the
    default COMPILE command. With this feature, you can append file
    specifications or command qualifiers to the default COMPILE
    command without having to type the entire command yourself.

    If the command string or the string specified on the /COMPILE_
    COMMAND qualifier contains LSE$FILE, then LSE forms the command
    used to compile the buffer by substituting, for LSE$FILE, the file
    specification that corresponds to the buffer. With this feature,
    you can insert text on the command line immediately after the
    file specification and before the /DIAGNOSTICS qualifier. If the
    COMPILE command does not contain LSE$FILE, then LSE appends the
    file specification to the string specified on the qualifier.