Merge some of the files out of many files in JCL?

[Krishna Veni]

Hello,

There is a catalogued procedure in which 15 files are concatenated. Now for some reason I need to merge some files in the same steps. For example, how to override these files such that file2, file5,file9 and file15 are merged?

I did not answer the question as I don't how to do it. Can someone suggest an answer.

[zprogrammer]

You could dummy the FILE2,FILE5,FILE9 and FILE15 and override the merged dataset as a new dataset.

[William Collins]

You can't use DUMMY or DSN=NULLFILE in a concatenation if it is followed by data that you want.

You'd have to override to a dataset with no records but with an end-of-file (been opened for output, and closed).

[Anuj Dhawan]

I agree with William. Once you have DUMMY in the concatenated files, that's the 'end of file' - rest of the files in the concatenation, after the DUMMY, are ignored by the system.

[zprogrammer]

Thanks for correction Anuj and Williams

[nicc]

So, if you want to concatenate only datasets 2, 4, 9 and 15 you code them as the first four and the fifth is DUMMY:

Code: Select all

//DDNAME DD DSN=DATASET2,DISP=SHR
//       DD DSN=DATASET4,DISP=SHR
//       DD DSN=DATASET9,DISP=SHR
//       DD DSN=DATASET15,DISP=SHR
//       DD DUMMY