IF
Keywords: sic

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IF

            [SIC\]IF Logical_Expression [THEN]
            [SIC\]IF Logical_Expression Command [Arguments]

        The first form starts a conditional IF block. The behaviour of IF blocks
        is similar to structured Fortran. The THEN keyword is optional.
        The second form defines a logical IF statement, i.e. it  uses  a  single
        line  with  no possibility of alternate execution (no ELSE choice). When
        the argument following the logical expression is not THEN, it is assumed
        to  be a command which will be interpreted, together with the next argu-
        ments, if the logical expression evaluates as true.

        This command can only be used within a procedure: interactive users  are
        expected to be able to make their decisions themselves.

        The  logical expression must be a single argument (no blanks); composite
        expressions using .AND. or .OR. operators are supported.  Logical  func-
        tions  like EXIST, FILE, or FUNCTION can also be used (see HELP FUNCTION
        for details).