to concatenate two Datasets.

//JOB1 JOB
//STEP1 EXEC PGM=IEBGENER
//SYSUT1 DD DSN=KC03H09.$MARIST$.LIBRARY(AREA),DISP=SHR
// DD DSN=KC03H09.$MARIST$.LIBRARY(LAB),DISP=SHR
//SYSUT2 DD DSN=KC03H09.$MARI$.LIBRARY(MEM),DISP=SHR
//SYSIN DD DUMMY
//SYSPRINT DD SYSOUT=*