Altering Load Modules

IEBCOPY updates the load modules that were created before MVS/370 to load faster. ALTERMOD statement is a one-time update operation used on load modules from old systems to make them compatible with the latest systems. ALTERMOD performs the update operation on the load modules without taking a backup.

The ALTERMOD statement is ignored under these conditions -

• The load modules are link edited with the noneditable (NE) attribute.
• The dataset is a PDSE.

Practical Example -

Scenario - Alter FIRSTPRG load in MATEPK.IEBCOPY.INPLOAD.

JCL -

----+----1----+----2----+----3----+----4----+----5----+
//MATEPKI  JOB (123),'MTH',CLASS=A,MSGCLASS=A,MSGLEVEL=(1,1),
//             NOTIFY=&SYSUID 
//***************************************************
//* ALTER FIRSTPRG LOAD MODULE FROM INPUT PDS
//***************************************************
//STEP10   EXEC PGM=IEBCOPY
//SYSPRINT DD SYSOUT=*
//SYSOUT   DD SYSOUT=*
//SYSDUMP  DD SYSOUT=*
//SYSUT1   DD DSN=MATEPK.IEBCOPY.INPLOAD,DISP=(OLD,KEEP)
//SYSUT2   DD UNIT=SYSDA,SPACE=(TRK,(5,1)) 
//SYSIN    DD * 
 ALTERMOD  OUTDD=SYSUT1
       SELECT    MEMBER=(FIRSTPRG)
/*

Output -

Explaining Example -

• SYSUT1 DD DSN=MATEPK.IEBCOPY.INPLOAD - Specifies the PDS that has old load modules.
• SYSUT2 DD - Provides the buffer space to process the operation.
• SYSIN DD - Has the control statements for processing the input.
• ALTERMOD OUTDD=SYSUT1 - Used to alter the load module from SYSUT1 DSN.
• SELECT MEMBER=(FIRSTPRG) - FIRSTPRG member is the selected module for this operation.