JCL (Job Control Language) is used on IBM mainframes to instruct the operating system how to run batch jobs and start subsystems. It acts as an interface between application programming and the MVS Operating System. JCL is used for compiling and executing batch programs, controlling jobs, allocating files, sorting files, and more. JCL uses statements like JOB, EXEC, and DD to identify the job, specify execution parameters, and define file allocations respectively.

1. MAINFRAMES REFRESHER PART-1 JCL
JCL
 Job Control Language (JCL) is a name for scripting
languages used On IBM mainframe operating systems
to instruct the system on how to run a batch job or start
a subsystem.
 JCL acts as an interface between application
programming and MVS Operating system.
 Jcl is used for compilation and execution of batch
programs.

2. MAINFRAMES REFRESHER PART-1 JCL
 Apart from the above functionalities JCL can also be used for,
1. Controlling the jobs.
2. Create GDG’S.
3. Allocate PDS,PS file with IBM Utilities.
4. Create Procs.
5. Sort the files.
JCL Coding Sheet
1,2,3----------Column Numbers----------72,73------------80
//JOBNAME JOB PARAMETERS------COMMENTS
// EXEC
// DD
//* ------------ Comment (* in 3rd column indicates line in comment)
//------------ End of JCL

3. MAINFRAMES REFRESHER PART-1 JCL
 Where // ----- Identification Field
job name------- Naming field
JOB,EXEC,DD - Statement / Operation
 NOTE
If we want to continue parameters in the next line
end the last parameter with “,” and continue next
parameter only in 4-16 columns.
 There are three statements in JCL.
 JOB
 EXEC
 DD

4. MAINFRAMES REFRESHER PART-1 JCL
 JOB Statement:
 Job statement is used to identify job name and job related
parameters
 JOBCARD = job name + job related parameters.
Syntax
//JOBNAME JOB ACCOUNT INFORMATION,’USERNAME’,CLASS=A-
Z/0-9,
// NOTIFY =&SYSUID/RACF ID,MSGCLASS,
// MSGLEVEL=(X,Y),PRTY=0-15,
// TIME=(M,S),REGION=MB/KB,TYPRUN=SCAN/
// HOLD/COPY,COND=(RC,OPERATOR,STEPNAME)
// COND=ONLY OR COND=EVEN,RESTART=STEPNAME

5. MAINFRAMES REFRESHER PART-1 JCL
 JOBNAME
 It is required to identify this job from other jobs in the SPOOL
 1 to 8 characters minimum 1 character and maximum is 8
character.
 1st character must be alphabet.
 Other characters can be alphabets or numeric or $,&,#.
 Example
 Job names for personal or lab sessions
Userid + 1 / 2 chars
KC03P83$ ------- Userid is KC03P83
KC03P84&--------Userid is KCO3P84

6. MAINFRAMES REFRESHER PART-1 JCL
 ACCOUNTING INFORMATION
 It is a keyword parameter and codes it after JOB statement.
 It is used for billing purpose, in real time when we submit
any job it is going to take some CPU time. Based on the
CPU time there will be some amount involved where this
amount has to go will be decided by A/C information
parameters.
 Examples
(8012T)
(80121I)
(8012M)

7. MAINFRAMES REFRESHER PART-1 JCL
 USERNAME
It is used to identify the user who has written the JCL.
It can be maximum of 20 characters.
Note Both A/C information and user name are
positional parameters and the remaining job
card parameters are keyword parameters.
EX1: //KC03P83A JOB (487A),’JANAKI RAM’
EX2: //KC03P84& JOB (488T),’SOMISETTY’

8. MAINFRAMES REFRESHER PART-1 JCL
 NOTIFY
 To which user id the job has to be notification after successful or
unsuccessful completion.
 Successful completion means MAXCC = 0 (or) 04 unsuccessful
completion means MAXCC > 04.
 If it is not coded,then user has to check the status of the job from the
spool.
 It has two methods.
 NOTIFY = USERID------ When userid is given then it will notify
to the given user.
 NOTIFY = &SYSUID----- When &SYSUID is given then it will it
replace current USERID

9. MAINFRAMES REFRESHER PART-1 JCL
 CLASS
 It is used to assign the properties to the job. Suppose if you
submit at the job at the same time which job has to run first
time and which job has to run 2nd time and so on will be
decided by class parameter.
 Note This class parameter priority is set by MVS Admin Team
 It has single character from A-Z
 Each class has properties on resources over the other classes

10. MAINFRAMES REFRESHER PART-1 JCL
 CLASS
 Real Time Examples
 Class = P----- Production Class
 Class = M---- Model/UAT Class
 Class = I ----- SIT Class
A – Short Running Class
B – Long Waiting Class
C – Long Running Class
In test region more users submit their jobs, so more classes required.
In SIT/UAT/PROD most of jobs are submitted one after the other.