Answer : JCL is Job Control Language and is used for Batch processing. The startup procedures of OS and standard products like CICS etc are written in JCL. It is interface between operating system(MVS) & application program. when 2 related programs are combined together on control statements is called job control language
Answer : An include statement identifies a member of a pds or pdse that contains. This set of JCL statements is called an include group. The system replaces the include statement with the statements in the include group.
Answer : COND means condition parameter. It is compared with system return code of previous step. //step1 exec pgm=abcd //step2 exec pgm=xyz, cond=(4,lt) step2 will be executed when system return code of step1 is less than 4.
Answer : The EXEC statement identifies the program to be executed via a PGM= program name keyword. Its format is //jobname EXEC PGM= program name. The PARM= keyword can be used to pass external values to the executing program.
Answer : The DD statement links the external dataset name (DSN) to the DDNAME coded within the executing program. It links the file names within the program code to the file names know to the MVS operating system. The syntax is //ddname DD DSN=dataset name. Other keywords after DSN are DISP, DCB, SPACE, etc