What is the function of dd disp parameter?


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I have a JCL which 20 steps. How do I execute 17 th step alone (It should execute only 17ths tep.and it should not execute 18,19,20 steps??

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How do you designate a comment in JCL?

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There are 2 steps in a JCL. If the first step abends due to system or user abend and the second step has COND specified as EVEN or ONLY, will this step still be executed inspite of the abend in the previous step?

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i created one base gdg with lrecl = 100 , now i need to create versions with different lrecl =150,200 can it be possible to create like tht ?

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I've one sequential file, that file size is LREC=100 (File contain Records like 1 to 100). Now I was increase the file size is LREC=102. My question is I want insert 00 (Two Zeros) in to the new file (That output file looks like : 00123 up to 100). How will write the SORT card in JCL. Please let me know.

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How would you understand error(execution phase)?

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hi,i have joined in mainframe course recently. ihave a doubt ragarding restart parameter.what is d use of it. and what is d syntax for it. any one give me d answer pls.

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i) Difference between ps, esds, ii) Difference between lrecl, blksize among PS, PDS issues? i.e in jcl at dcb

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What is the meaning of the EXEC statement keyword, COND? What is its syntax?

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what are the types of abends that occur on job failure? And explain the possible causes of these

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