IBM OS/390 manual Comparison of Power and JES2 Jecl a Summary, List Card * $$ LST

4.4 JECL

JECL is very important in VSE and is commonly used. The difficulty from a conversion standpoint is to determine where the job is due to having two different job cards in JCL. The JECL statement is a POWER job, the DOS Job or VSE Job is the // JOB. The POWER job is like the MVS JOB. This is where the class and priority information is specified. It exists at the beginning of a job stream.

JES control statements are not recommended for new applications. You should use the new JCL statements such as // OUTPUT instead of the /*OUTPUT, /*ROUTE JECL statements. Today most JECL functions can be accomplished through standard JCL statements.

See Table 10 on page 90 for a list of recommendations.

4.4.1.1 LIST Card - * $$ LST

The LIST card in VSE is the equivalent of both // DD SYSOUT statement and

OUTPUT statement in MVS.

Defaults, list and punch destinations can be put on the VSE JOB card as well as the LST card. Both are merged into the OUTPUT statement in MVS.

There is a difference between the scope of a LST statement and an equivalent

DDstatement. In MVS a DD statement is only viable for one step. In VSE, a * $$ LST statement is in effect from the time it is processed by POWER until EOJ or another LST statement for the same device address is processed. As soon as the effect of a given LST statement ends then the output is available for printing.

4.4.1.2 Data Statement - * $$ DATA

The data statement in VSE is a way for an include in SLI to specify the point where some data external to that include statement should be processed. It is similar to sending overrides in JECL but not as cumbersome in the space with the line number. The data statement allows you to pass data to a step. The step could be in the middle of an include statement. This is a commonly used method. The MVS equivalent is either a DD DATA override or a DD that points to a PDS member or a sequential data set.

4.4.2 Comparison of POWER and JES2 JECL - A Summary

Table 9 (Page	1 of 2). Overview of POWER JECL Statements
POWER	Function	JES2 or MVS Equivalent
Statement
* $$ CTL	Assigns a new default input	$T RDR(nn),Class=class
	class to VSE/POWER jobs.
* $$ DATA	Inserts data from the reader	// DD * or
	queue into a library member	// DD DATA
	after this member was
	retrieved for inclusion into a
	VSE/POWER job.
* $$ EOJ	Indicates the end of a	//
	VSE/POWER job.

Chapter 4. Job Control Language (JCL) Differences and Considerations 89