File disposition overrides



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File disposition overrides

Postby vinod_rana » Thu Apr 21, 2011 8:48 pm

Hi,

Can anyone please answer my below question?

Does file disposition in JCL override the file declared in cobol pgm.
E.g I give DISP=MOD in JCL but in program I give OPEN OUTPUT. In this case which one will be taken into account?

Thanks in advance
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Re: File disposition overrides

 

Re: File disposition overrides

Postby steve-myers » Thu Apr 21, 2011 8:57 pm

DISP=MOD in JCL probably overrides the Cobol OUTPUT option. An Assembler programmer can effectively reset DISP=MOD to DISP=OLD, though I've never done it and I've never heard of it being done. An Assembler programmer also has the EXTEND option in the Assembler OPEN macro to do sort of the equivalent of DISP=MOD. I don't know if there is a similar option in the Cobol OPEN verb.
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Re: File disposition overrides

Postby vinod_rana » Thu Apr 21, 2011 9:40 pm

Thanks Steve!!!
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Re: File disposition overrides

Postby NicC » Fri Apr 22, 2011 12:37 am

DISP=MOD is opening for output - just that the data being written will be tagged onto the end of any data already in the dataset.
The problem I have is that people can explain things quickly but I can only comprehend slowly.
Regards
Nic
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