+=================================+
                      |                                 |
                      |              IFERR              |
                      |                                 |
                      +=================================+


SUMMARY

	The Iferr program gives the user a measure of conditional control over
his submit file execution.

    Iferr examines a specified compiler listing, ascertaining whether the
compiler found errors.  If so, the first block of submit file commands is
executed; otherwise, the second block of commands is executed.


SAMPLE INVOCATION

	IFERR :F1:PROG.LST


SAMPLE USE:

	Given the submit file:


    +---------------------------------------------------------------+
    |																|
    |    PLM80 :F1:PROG.SRC											|
    |    															|
    |    IFERR :F1:PROG.LST											|
    |        EDIT :F1:PROG.SRC ^E									|
    |        LOOP													|
    |    ELSE                                                       |
    |        LINK :F1:PROG.OBJ,SYSTEM.LIB,PLM80.LIB TO :F1:PROG.LNK |
    |        LOCATE :F1:PROG.LNK									|
    |    ENDIF														|
    |																|
    +---------------------------------------------------------------+


    if the module summary in the program listing reveals errors, then the user
enters the editor to fix the program source, and the Loop program forces
execution to resume at the beginning of the submit file.

    If there are no errors, then the object file produced is linked and
located.



FORMAL SPECIFICATION


The syntax is:  IFERR [?] <file name>
where <file name> is the ISIS pathname of a listing file.

      IFERR cond
      :         * if cond is true
      :         * this is executed
      ELSE
      :         * if cond is not true
      :         * this is executed
      ENDIF



IFERR commands can be nested:


      IFERR cond
      :         * if cond is true
      :         * this is executed
                        IFERR cond
                        :         * if cond is true
                        :         * this is executed
                        ELSE
                        :         * if cond is not true
                        :         * this is executed
                        ENDIF
      ELSE
      :         * if cond is not true
      :         * this is executed
      ENDIF



SEE ALSO

	loop.doc, pause.doc