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Hi All,
This was asked to me in an interview.
Lets say there is a PROC ABC which has DD sttemest having 3 files in concatenation say file1 file2 & file3.
Now in my JCL where I call this proc ABC I want to override file1 by file4 or file2 by file5; how this could be done? How a perticular file which needs to be overriden would be determined by the system? Please suggest.
Thanks in Advance
Shail.

Refer following tutorial
http://www.geocities.com/srcsinc/drona/ ... pter8.html


Section : Modify Statements in a procedure / on DD statements.


Sample JCL ...

Thanks Natrajan.
I am fine with the code but my question is how the system would know which file it has to override if it is having say 3 DSN in concatenation ( as i quoted in my question). How would I code override statement if I want to override file2 by file5?
My reply to the interviewer was that I would mention all three DSN names file1,file5(which is to replace file2) & file3 on DD statment as below;

//PROCSTEPNAME.DDNAME DD DSN=FILE1,DISP=SHR
FILE5,DISP=SHR
FILE3,DISP=SHR

Not sure if this was correct.
Thanks.

Yes, your answer is correct.