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What is positional parameter and keyword parameter and what is the difference between them?

  
Total Answers and Comments: 1 Last Update: December 29, 2007     Asked by: saranya 
  
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December 28, 2007 08:11:07   #1  
Mazhar9 Member Since: December 2007   Contribution: 7    
RE: What is positional parameter and keyword parameter and what is the difference between them?
Positional parameters should come in an order...and key word parametes can come in any order....

Positional ParametersA positional parameter must be placed in a specific position within the operand field. (If you want to omit a positional parameter you must replace that parameter with a comma.)


Example: //U99999A JOB (*) ’Mazhar’


In this example the two positional parameters are separated by a comma. The first parameter (*) allows the system to determine accounting information from the TSO logon userid. (Accounting information is always positioned as the first parameter following the job name field.) The second parameter 'Mazhar' is the user’s name.

here if you dont want to use the user name and want to code CLASS parameter like then u need to leave a comma like this

//U99999A JOB (*) CLASS A << Observe two commas after (*)


Keyword ParametersKeyword parameters have no special position or order within the operand field. However they follow any required positional parameters within a job statement. A keyword is entered followed by an equal sign and a value.

Example:

TIME (1 30)

This parameter contains the keyword TIME followed by an equal sign and two values in parentheses. (This example instructs the computer that the CPU should not process the job for longer than one minute and 30 seconds.)


 
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A keyword in a JCL statement may appear in different places and is recognized by its name, eg. MSGCLASS in the JOB statement. The opposite is positional words, where their meaning is based on their position 
Latest Answer : positional and keyword parameters comes to jcl statements keyword means for information ...
The JOB statement is the first in a JCL stream. Its format is // jobname, keyword JOB, accounting information in brackets and keywords, MSGCLASS, MSGLEVEL, NOTIFY, CLASS, etc.  
Latest Answer : Notify is misspelled in the 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 
Latest Answer : EXEC statement refers to a PROGRAM or a PROCEDURE to be executed Syntax: //stepname    EXEC   PGM=pgm-name,parametersOR //stepname     EXEC    procedure-name,parametersParameters are1.Positional(pgm-name,procedure name) 2.Keyword (PARM,REGION,ACCT,COND,TIME) ...
PROC stands for procedure. It is 'canned' JCL invoked by a PROC statement. An instream PROC is presented within the JCL; a catalogued PROC is referenced from a proclib partitioned dataset.  
Latest Answer : I believe most give you the flavor of what it is. One of the main reasons for using a PROC is so that you can supply substitution variables. For example if you use a PROC to install software, you might supply a variable like &HLQ so that ...
A symbolic is a PROC placeholder; the value for the symbolic is supplied when the PROC is invoked, eg. &symbol=value. An override replaces the PROC's statement with another one; it substitutes for 
Latest Answer : Symbolic parameters are placed in the EXEC statements , and during compilation of the JCL, will replace the value. A typical use of Symbolic variables is, we can write generic PROC to be executed in various test and production regions by using Symbolic ...
RESTART is a JOB statement keyword. It is used to restart the job at a specified step rather than at the beginning.  
Latest Answer : Restart is a keyword which is used in mainframes to restart the perticular step in the job at not the begining ...
DISP=OLD denotes exclusive control of the dataset; DISP=SHR means there is no exclusivity.  
Latest Answer : DISP=OLD --> Exclusive HOLD. Read from beginning of dataset. But if u write, then it will overwrite on existing data. i.e old data is lost. DISP=MOD --> Exclusive HOLD. You can write to the end of the file without loosing your old ...
What are the keywords associated with DCB? How can you specify DCB information? What is the OS precedence for obtaining that DCB information, ie. where does the system look for it first?
The keywords associated with the DCB parameter are LRECL, RECFM, BLKSIZE and DSORG. The DCB information can be supplied in the DD statement. The sysem looks for DCB information in the program code first. 
COND specifies the conditions for executing the subsequent job step. The value after the COND= is compared to the return codes of the preceding steps and if the comparison is true, the step is bypassed. 
Latest Answer : In exec statement the condition is used for by-passing the perticular step through the condition,if COND=0 Its a successfull executionif COND=4 Its a warning if COND=8 Its a serious errorif COND=16 Its a fatal error.So that we can use this condition key ...
The value after the PARM= specifies control information to be passed to the executing program of the job step.  
Latest Answer : It is only used for to pass the values by JCL to the perticular application program like COBOL program. ...

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