$ERR.HEL

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Revision as of 03:05, 31 January 2013 by rosettacode>Gerard Schildberger (added this page which is HELp for the $ERR.REX (REXX) program. -- ~~~~)
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The  $ERR  command is used to display an error message (or messages) from a
predefined list of over 100 messages.

Usually,  five lines are displayed  (all in red if  color is supported):

            {a blank line}
            ($$$14nn) *error*:
            an error message
            maybe error message2
            possible error message3
            for the ──────── ccc ──────── command.
            {a blank line}

The format of the  $ERR  command is:

╔══════════════════════════════════════════════════════════════════════════════╗
║                                                                              ║
║   $ERR    errnum   EXECname    {xxx yyy zzz}    {..F=fff}                    ║
║                        ,                                                     ║
║           ?                                                                  ║
║           ?AUTHOR                                                            ║
║           ?FLOW                                                              ║
║           ?SAMPLES                                                           ║
║                                                                              ║
╚══════════════════════════════════════════════════════════════════════════════╝

───where:

?            shows this help file            (press  ESC  to quit when viewing).

?AUTHOR      shows the author of this program.

?FLOW        shows the external execution flow of this program.

?SAMPLES     shows some sample uses          (press  ESC  to quit when viewing).

errnum       is the number of the error message(s)  (numbered from 1400──►1499),
             or  14.1  (which indicates that the REXX program has been  HALTed).

                  0  exits $ERR.
                                                                     '
EXECname     is the name of the invoking EXEC  and if not a comma, it's shown in
             the last error message (see above).

xxx yyy zzz  are optional arguments that the error message text(s) may require.

fff          is an optional filename that the error message text(s) are written
             to.    Any commas (,) in the filename are translated to blanks
             before it's used.


The return code is set to the last two digits of the errnum,  except for error
1468,  which uses the retcode (error code) from the 3rd argment  which is an
code code recieved from another command that failed.

Another special case is error  14.1  which signifies that the REXX program has
been   HALTed   and the return code is set to  14000.

                                      Ω