The JOL effort is commendable, but replacing JCL is about much more than a
nicer syntax or easy movement between foreground and background.

At the risk of repetition, other reasons are (1) to eliminate the
separation between scripting code and application code and (2) to interface
with other software/data (files, DB2, ISPF, etc.).

Resistance to replacing JCL comes from the fact that "everybody knows JCL"
(which they don't really).  Everybody (in the target audience) knows REXX,
if not directly, then because REXX has many well-know features of other
languages.  JCL resembles only mainframe assembler.

Add in PIPElines and you get a productivity and performance improvements
unlike any other option available.  Charles's example in REXX and PIPElines
might look like this.

   1. "pipe (end ?) ? < trans | v: validate | g: gate",
   2.   "? v: sort 10.10 | g:| u: update | >" GDG("payroll.master(+1)")",
   3.   "? <" GDG("payroll.master(0)") | u:"
   5. if RC = 0 then
   6.     "submit job2"
   7. else
   8.     "delete" GDG("payroll.master(0)")

I tried to stay true to Charles's example.  If you can to skip invalid
transactions, but still process valid ones (a reasonable approach), you can
eliminate the GATE and combine the first two streams.

GDG() is a function that I've previously written.

Note that zero intermediate files are needed, saving those I/O operations.

I haven't read the details of JOL, so I might be missing something.  I'm
happy to be educated.

JCL is the buggy whip of 21st century computing.  Stabilize it.
Put Pipelines in the z/OS base.  Would you rather process data one
character at a time (Unix/C style), or one record at a time?
IBM has been looking for an HLL for program products; REXX is that language.

On Wed, Jul 11, 2018 at 6:40 AM, David Crayford <> wrote:

> On 11/07/2018 7:19 AM, Clem Clarke wrote:
>> Don't know about that! I always think that IBM has some of the best
>> people and concepts.  Pity IBM didn't push PL/I instead od allowing C to
>> rule the world.
> They did, but something that's free will always be more attractive.
> Multics was originally written in PL/I but the UNIX devs didn't think it
> was suitable for operating systems.
> However, there's an interesting IBM lab in Perth that has some excellent
>> people. Not many people know about it.
> Not any more! They all got the push when IBM recently cut their workforce.
> A few of them moved to HCL with the PD products. The rest of them are
> looking for work.
> ----------------------------------------------------------------------
> For IBM-MAIN subscribe / signoff / archive access instructions,
> send email to with the message: INFO IBM-MAIN

For IBM-MAIN subscribe / signoff / archive access instructions,
send email to with the message: INFO IBM-MAIN

Reply via email to