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saara
New User
Joined: 12 Jul 2005
Posts: 5
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| I am new to REXX..new to mainframes too...I am interested in learning REXX and to develop some tool using REXX. I know there is a manual out there but I would like to learn it practically. Could someone let me know where to start and how to start. I need to know where exactly to write the code and how to start executing it. Some commands to help me walk around screens as well as guidance and advise on some books would be highly appreciated |
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References
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 Posted: Tue Jul 12, 2005 11:43 pm Post subject: Re: Want to learn REXX |
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superk
Moderator Team Head
Joined: 26 Apr 2004
Posts: 2999
Location: Charlotte,NC USA
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| saara wrote: |
| Could someone let me know where to start and how to start. |
The best way is to look at the other existing REXX exec's at your site and pick them apart to see how they work. Take a look at the REXX exec's posted here.
Otherwise, I'd start by writing a simple file copy exec (copy all input records to output). Then, modify the records a bit. Add some parameter input to change the output further. Write the output in reverse order. Setup some looping structures. Create a formatted report.
Delve into using REXX in other environments (TSO, ISPF, Netview, Automation, etc.). |
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superk
Moderator Team Head
Joined: 26 Apr 2004
Posts: 2999
Location: Charlotte,NC USA
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An easy way to run a REXX exec:
| Code: |
//STEP1 EXEC PGM=IEBGENER
//SYSUT1 DD *,DLM=@@
/* REXX */
Say "Hello, world"
Exit 0
@@
//SYSUT2 DD DSN=&&PDS(PROG1),DISP=(,PASS),UNIT=VIO,
// SPACE=(CYL,(1,1,1),RLSE)
//SYSPRINT DD SYSOUT=*
//SYSIN DD DUMMY
//*
//STEP2 EXEC PGM=IRXJCL,PARM='PROG1'
//SYSEXEC DD DSN=&&PDS,DISP=(OLD,PASS)
//SYSTSPRT DD SYSOUT=*
//SYSTSIN DD DUMMY
//*
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saara
New User
Joined: 12 Jul 2005
Posts: 5
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| Thanks for the sample code. Could you please tell me what will this do. Also please let me know how to execute this..should i just submit or is there any other way to execute it... |
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superk
Moderator Team Head
Joined: 26 Apr 2004
Posts: 2999
Location: Charlotte,NC USA
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The sample job you would just submit.
It will display the text "Hello, world" on the terminal (the SYSTSPRT DD is used for the terminal output). |
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Edgar Ye
New User
Joined: 11 Apr 2005
Posts: 1
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Sara ? I think i should know you . I am interested in REXX and new to REXX too ,
I have some references about it , pls feel free to contact me . |
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vijayamadhuri
Active User
Joined: 06 Apr 2005
Posts: 188
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| I have some material may be it could help |
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saara
New User
Joined: 12 Jul 2005
Posts: 5
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VM,
Thanks a bunch for ur user guide. I have started with my rexx learning and have started a bit of writing code as well. I am interested in developing some tool using REXX. I also need to know how to add my PDS in SYSEXEC so that I can come up with a tool and just say a command to execute it instead of going to the member to execute it.
Edgar,
Nice to know you too are starting to learn. Do send me any reference material that you have for begining with REXX. |
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krishna vijay
New User
Joined: 29 Aug 2005
Posts: 2
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| vijayamadhuri wrote: |
| I have some material may be it could help |
hi,
i am new to rexx as well as mainframes. can u send me the references or whatever u have.......?
thank u
kris |
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fonrob
New User
Joined: 30 Jul 2003
Posts: 3
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the sample job does not get executed becase it does not have a job card
you need something like this depending on your shop
//Z90FHR1 JOB (V4Z900000P,Z90,2),'TEST JOB FOR ME',MSGCLASS=Y,
// TIME=1,NOTIFY=Z90FHR1 |
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surya1
New User
Joined: 21 Sep 2005
Posts: 1
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| i have already included the job card.. still this doesnt work.. |
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Kevin
Active User
Joined: 25 Aug 2005
Posts: 256
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This is a quote from another Forum that is quite nice:
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This is a common problem for new users; they don't understand the difference between Rexx and ISPF or TSO and ISPF. You absolutely need to understand those differences before you can use the services of ISPF within a Rexx exec or any other kind of program.
In a nutshell:
* Rexx is a scripting language available on many, many platforms. One of the places it can run is z/OS (MVS). Within z/OS it can run in many environments such as batch, CICS, USS and TSO. If you want to use TSO services, you must be running under TSO (not IRXJCL).
* TSO is the underlying foundation to the user 3270 and command interfaces for MVS. When you sign on to a terminal with your TSO id, you are using TSO. Similarly, when you run IKJEFT01 (or IKJEFT1A, etc) in batch you are also running TSO. Rexx can run outside of TSO but if you want to use TSO commands like ALLOC, FREE, DELETE, etc. you need to be running in a TSO address space and invoke the Rexx exec from TSO.
* ISPF is an add-on that runs under TSO. It has its own set of services for doing things like editing files, displaying panels and the like. It requires TSO but has its own programmable services accessed in Rexx via Address ISPEXEC. ISPF services can also be accessed through most other programming languages (COBOL, Assembler, C, APL, etc) but ISPF, and hence TSO must be there too.
It is very common to see questions phrased as "I am new to Rexx... how do I do "? They are not the same thing (though you can usually use Rexx to tell ISPF to do . It may seem like a picky detail, but if you want to find out where to look for answers, you need to know what component does what you are looking for.
One other misconception about ISPF is that it is driven only by CLISTs or Rexx. I often see people say 'look for the CLIST that drives option X" and that is often good advice, but very rarely is IBM or other vendor code written in Rexx. Usually it is a compiled program in COBOL or Assembler so looking for source is not helpful.
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superk
Moderator Team Head
Joined: 26 Apr 2004
Posts: 2999
Location: Charlotte,NC USA
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