面试题与答案

JCL stands for Job Control Language. It is a scripting language used on IBM mainframe operating systems to instruct the system on how to run a batch job or start a subsystem.

Example:

//JOBNAME JOB ...,CLASS=A,MSGCLASS=X

DD (Data Definition) statement is used to define input and output datasets for a program or job step in JCL.

Example:

//INPUT DD DSN=INPUT.FILE,DISP=SHR

DISP (Disposition) parameter is used to specify what should happen to a dataset after the job step completes, such as DELETE, KEEP, or CATLG.

Example:

//OUTPUT DD DSN=OUTPUT.FILE,DISP=(NEW,CATLG,DELETE)

SYSOUT is used to specify the destination for the system output produced by a job step, such as a printer or a dataset.

Example:

//STEP1 EXEC PGM=XYZ,SYSOUT=A

The NOTIFY parameter is used to specify the user who should receive job completion or error messages. It is used for notification purposes.

Example:

//JOBNAME JOB ...,NOTIFY=USERID

The MSGLEVEL parameter is used to control the amount of system messages written to the job log. It can be set to options like (1,1), (1,2), (2,2), etc.

Example:

//JOBNAME JOB ...,MSGLEVEL=(1,2)