<[EMAIL PROTECTED]> wrote in message news:<[EMAIL PROTECTED]>... > Assuming the following JCL: > > //DD1 DD DSN=dsname1,disp=shr > // DD DSN=dsname2,disp=shr > // DD DSN=dsname3,disp=shr > > Where DD1 is opened for input. > All files are on DASD. > How can I tell when dsname1 has been 'exhausted' and reading > starts on dsname2, etc? You didn't say what access method you are using, or what "I" is that is going to tell. I assume that "I" is an Assembler program that is doing the reading via a DCB with some access method. If this is true, then you can find the IOB from the DCB, and the M part of the IOB's MBBCCHHR will be incremented by one each time you move from the end of one data set's extent to either the next extent for that data set or else the next DD. If all data sets involved are single-extent files, then it is easy. If not, more programming is necessary to go from the IOB's M to find which data set is involved. If "I" is TMON/MVS, then you can find the IOB and set the screen to auto-refresh every X seconds. Then you can watch M change visually. Bill Fairchild Plainfield, IL
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