On Mon, 1 Aug 2011 01:44:03 +0100, CM Poncelet <ponce...@bcs.org.uk> wrote:
>If I am wrong, please prove it by submitting verifiable 'general >purpose' examples of this (excluding 'reblocking' trivia). A 'verifiable >example' is one in which all the program's DCB attributes are different >from those of the dataset's physical DCB attributes on DASD - yet >override the dataset's DCB attributes stored on DASD *both* when the >dataset is opened and written for OUTPUT and also when it is opened and >read for INPUT (subject to the appropriate MACRF= etc. being specified >on the DCB in each case). If you cannot prove it by a 'verifiable >example', then you are arguing high-falluting semantics where the >interpretation of "DCB override" depends entirely upon what *you* mean >by that, and is not subject to what "DCB override" is actually >understood to mean in practice. > >Thanks, > >Chris Poncelet OK, explain how this JCL works. I used JCL similar to the following for many years to copy VM/CMS files to MVS that were longer than 80 but a multiple of 80 in length. In this example, the records are 160 in length. They are split into two 80 byte records, then "joined" into 160 byte records by overriding the LRECL of the disk file via JCL. //COPY EXEC PGM=IEBGENER //SYSPRINT DD SYSOUT=A //SYSIN DD DUMMY //SYSUT2 DD DSN=&&TEMP,DISP=(,PASS,DELETE), // UNIT=SYSDA,SPACE=(1600,(10,10),RLSE), // RECFM=FB,LRECL=80,BLKSIZE=1600 //SYSUT1 DD DATA,DLM='++' PART1.... PART2.... PART1.... PART2.... ++ //SORT EXEC PGM=SORT //SYSOUT DD SYSOUT=A //SORTIN DD DSN=&&TEMP,DISP=(OLD,DELETE), // RECFM=FB,LRECL=160,BLKSIZE=1600 //SORTOUT DD DSN=MY.DATA.SET,DISP=(,CATLG,DELETE), // UNIT=SYSDA,SPACE=(1600,(10,10),RLSE), // RECFM=FB,LRECL=160,BLKSIZE=1600 //SYSIN DD * SORT FIELDS=COPY END /* The key for this to work is that the BLKSIZE has to be a multiple of 80 and 160. This will work for any records that are a multiple of 80, (160, 240, etc.). I needed to put the VM/CMS file inline so it had to be a multiple of 80 bytes to work. This example clearly shows that the JCL LRECL overrides the file setting and no error occurs. -- Dale R. Smith ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@bama.ua.edu with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
