Reserved Names

1
Reserved Names
2

• //TPEIN DD UNITTAPE,DSNPR.FLE,
  // DISP(OLD,KEEP,KEEP)
• DDNAME - one to eight alphanumeric characters.
  The first character must be alphabetic. The
  DDNAME comes from the external reference name
  in the SELECT Clause of the ENVIRONMENT
  DIVISION of a COBOL program.
• Reserved DDNAMES - The following DDNAMES are
  specifically recognized by the operating system
  for a specific data set and cannot be used
  for any other purpose
• JOBCAT JOBLIB SYSABEND
  STEPCAT STEPLIB SYSUDUMP
  

3

• //JOBLIB DD DSNLIB.NAME, DISP(SHR)
  //STEPLIB DD DSNLIB.NAME, DISP(SHR)
• JOBLIB and STEPLIB DD statements instruct the
  operating system to fetch the program named
  in the EXEC statement from the library
  specified in the JOBLIB or STEPLIB DD
  statement. They are used whenever a program
  resides in a library other than SYS1.LINKLIB.
• A JOBLIB DD applies to the entire job and, if
  present, is the first DD statement immediately
  following the job statement.
• A STEPLIB DD applies only to the particular job
  step and must be placed following the EXEC
  statement for the job step.

4

• //JOBCAT DD DSNCAT.NAME, DISP(SHR)
  //STEPCAT DD DSNCAT.NAME, DISP(SHR)
• JOBCAT and STEPCAT DD statements instruct the
  operating system to use a private user
  catalog rather than the system catalog.
• A JOBCAT DD applies to the entire job and, if
  present, is placed following the job
  statement and any JOBLIB statement and before
  the first EXEC statement.
• A STEPCAT DD refers only to the particular job
  step and must be placed following the EXEC
  statement for the job step.
  
  
  4

5

• //SYSUDUMP DD SYSOUTA //SYSABEND
  DD SYSOUT A
• The SYSUDUMP DD statement provides a core dump
  of the programs virtual storage partition
  in the event the job terminates abnormally.
• The SYSABEND DD statement provides a core dump
  of the entire system nucleus in addition to
  the above.
  
  
  

6

• //CUSTBLG JOB ,SMITH,PRTY7,CLASSA, //
  
  MSGLEVEL(1,1),MSGCLASSA //CALCBLG EXEC
  PGMCALCBLG,TIME2, //
  PARM(CYCLE1,UPDATE) //SYSUDUMP DD
  SYSOUTA //INMASTER DD DISP(OLD,KEEP,KEEP)
  , //
  DSNBILLING.MASTER //PAYCHGS DD
  DISP(OLD,DELETE,KEEP), //
  DSNBILLING.CHANGES, //
  UNITDISK //TAXTBLS DD
  DISPSHR,DSNTAX.TABLES

7

• //UPDMSTER DD DISP(NEW,CATLG,DELETE), //
  
  DSNBILLING.MASTER, //
  UNITTAPE, //
  DCB(LRECL160,BLKSIZE3200), //
  DCBRECFMFB) //BLGFILE
  DD DISP(NEW,PASS,DELETE), //
  UNITSYSDA,DSNBILLING.PRINT
  , //
  SPACE(TRK,(20,5),RLSE), //
  DCB(LRECL100,BLKSIZE4000) //
  DCB(RECFMVB)
  //ISSBILLS EXEC PGMISSBILLS,TIME(,30)
  //SYSUDUMP DD SYSOUTA

8

• //BLGRPT DD SYSOUTA//BILLS
  DD SYSOUT(H,,DP12)//BLGFILE DD
  DISP(OLD,DELETE,CATLG),//
  DSNBILLING.PRINT//

9

• //CUSTBLG JOB ,SMITH,PRTY7,CLASSA, //
  
  MSGLEVEL(1,1),MSGCLASSA //JOBLIB DD
  //JOBCAT DD //CALCBLG EXEC
  PGMCALCBLG,TIME2, //
  PARM(CYCLE1,UPDATE) //STEPLIB
  DD //SYSUDUMP DD SYSOUTA //INMASTER DD
  DISP(OLD,KEEP,KEEP), //
  DSNBILLING.MASTER //PAYCHGS DD
  DISP(OLD,DELETE,KEEP), //
  DSNBILLING.CHANGES, //
  UNITDISK //TAXTBLS
  DD DISPSHR,DSNTAX.TABLES

10

• //UPDMSTER DD DISP(NEW,CATLG,DELETE), //
  
  DSNBILLING.MASTER, //
  UNITTAPE, //
  DCB(LRECL160,BLKSIZE3200), //
  DCBRECFMFB) //BLGFILE
  DD DISP(NEW,PASS,DELETE), //
  UNITSYSDA,DSNBILLING.PRINT
  , //
  SPACE(TRK,(20,5),RLSE), //
  DCB(LRECL100,BLKSIZE4000) //
  DCB(RECFMVB)
  //ISSBILLS EXEC PGMISSBILLS,TIME(,30)
  //SYSUDUMP DD SYSOUTA

11

• //BLGRPT DD SYSOUTA//BILLS
  DD SYSOUT(H,,DP12)//BLGFILE DD
  DISP(OLD,DELETE,CATLG),//
  DSNBILLING.PRINT//