Avoiding the Need to Supply Control Statements

When the SYSIN DD statement is a DD DUMMY, points to an empty file, or is omitted, IEBCOPY will generate a control statement that allows you to run IEBCOPY without supplying a control statement data set for SYSIN.

The generated statement can take several forms, depending on what parameters are specified in the JCL EXEC PARM field.

1. When COMPRESS and REPLACE are not specified, the generated statement is: xxxxx OUTDD=SYSUT2,INDD=SYSUT1. The xxxxx will be ALTERMOD, COPYGROUP, COPYGRP or COPYMOD if you code one of those PARM options or a valid abbreviation. If you do not code one of them, the generated control statement will be COPY. The COPY, COPYGROUP, COPYGRP or COPYMOD will copy without replacing from the data set designated by the SYSUT1 DD statement to the data set designated by the SYSUT2 DD statement.
2. When COMPRESS is not specified but REPLACE is specified, the generated statement is: COPY OUTDD=SYSUT2,INDD=(SYSUT1,R) which will copy with replace from the data set designated by the SYSUT1 DD statement to the data set designated by the SYSUT2 DD statement.
3. When COMPRESS is specified, then the generated statement is: COPY OUTDD=SYSUT2,INDD=SYSUT2 which will compress in place the data set designated by the SYSUT2 DD statement.

When you specify any of the preceding parameters in the JCL EXEC PARM field, then IEBCOPY opens SYSIN and automatically generates a control statement.