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Built-in utilities provide often-needed programming functionality. By building them into FMLI they are more efficient to use than similar utilities provided in the UNIX system (that is, there is no need to fork a process to run them). FMLI recognizes built-in utilities in stand-alone backquoted expressions, and in backquoted expressions on descriptor lines.
FMLI built-in utilities return a Boolean value. It is FALSE if either the string false or a non-zero integer is returned, TRUE if 0 or any other string is returned. However, Boolean arguments to a utility follow standard format.