The JCL DD statement for beginners - M178

[@peteberrie]

This is bringing back so many memories for me. I was an IBM systems programmer from 1980 to the mid 1990s. I worked on OS/VS1, DOS/VSE, MVS and VM/SP as well as configuring CICS (of course!). In the 90s, I slowly moved into team leader / manager roles and left the hands-on work behind. Looking back, one of my favourite tasks debugging a system (or CICS) dump and fixing the Assembler code with SMP. In my early days, we had the known bugs on microfiche and IPLed from the card reader. I wish I had one in my garage!

[@moshixmainframechannel]

Great fun !

[@grappydingus]

Great video. Anything on JCL is always welcome!

[@Stosszahlansatz]

Love the new intro! And the video too. :-) My personal order of parameters in a DD is: DSN, DISP, UNIT, VOL, SPACE and DCB. The logic is simple: (generally) you just need the first two if the dataset is cataloged, the first four if the dataset exists but is not cataloged, and all of them if it is new.

[@techie_teko8923]

Learning cobol with jcl and I find your channel 🎉 thank you

[@moshixmainframechannel]

Welcome!

[@Sebastian-jf5cp]

This is gold. JCL is too often just being copied and not understood in detail.

[@EdouardTavinor]

oh, i'm going to watch this video a number of times ... lots of information

[@mieszkogulinski168]

That's why the Unix dd command (I used it on Linux to write disk images to bootable USBs) uses unusual syntax if=xxx of=xxx bs=1M instead of standard Unix command syntax - it's taken from the JCL :D

[@moshixmainframechannel]

Indeed

[@semuhphor]

Hi Moshix. If you know what each unit is, maybe you should do a short video describing each piece of equipment in the intro. So I saw 3350's? and what looked like 3270, but with weird black metallic boxy keyboards? Also, where were these machines? What were they used for? Very nice new intro.

[@moshixmainframechannel]

Good idea. I will try to do that

[@semuhphor]

@@moshixmainframechannel BTW, Thank you for this channel and these videos.

[@1977raider]

Hi I just subscribed & hope to get a job where I already work in mainframe opp...What is a good beginner book you would recommend? And thank you for making these videos

[@moshixmainframechannel]

Any JCL book is worth reading

[@Universe728]

This is awesome! Thank you.

[@kishorekumar6345]

Hi Moshix, do you offer any training on Mainframe?

[@moshixmainframechannel]

Yes! On this channel !

[@kishorekumar6345]

@@moshixmainframechannel I want to learn CICS and DB2, Do you provide any personal trainings? Or paid online trainings other than this channel sir?

[@moshixmainframechannel]

No

[@kishorekumar6345]

@@moshixmainframechannel Thank you Moshix, any references where I can start learning them?

[@moshixmainframechannel]

My KZbin channel. You are in it right now.

[@Lehander100]

Wow! 5 thousands kittens!!!

[@bossapp7664]

Which is the intro song?

[@harenber]

This is: Artist: Purple Motion Title: Satellite one (remake)

[@brucehewson5773]

Good job Moshe. Can consider DDNAME equivalent to a file handle. I prefer to code DD cards this way //DDNAME DD DISP=SHR,DSN=SYS1.DATASET.NAME The DSN parameter defines a variable length name up to 44 characters. Placing the DSN parameter as the last entry makes vertical alignment easier, and improves visual validation. For multiparm DD //* //SYSUT2 DD DISP=(NEW,CATLG,CATLG), // UNIT=3375, // VOL=SER=PUB001, // SPACE=(TRK,(300,60,20)), // DSN=BREXX.V2R2M0.INSTALL //* CONTIG is important where the dataset will be access directly = BDAM. An example is the RACF security dataset which must be one extent only. Another is the modern IODF dataset.

[@grappydingus]

Nice job throwing the BREXX reference in there! :)

[@brucehewson5773]

@@grappydingus You are welcome

[@semuhphor]

//SYSPRINT DD SYSOUT=A ... muscle memory lives.

[@TheStefanskoglund1]

Moshix: an example of a good book about JCL ? And not GC28-1349-1 the MVS/370 JCL user's guide. :-)

[@moshixmainframechannel]

Some very old OS/360 oriented JCL books are still very good