In this example, a user catalog is defined and all defaults are taken.

//DEFUCAT  JOB  ...
//STEP1    EXEC PGM=IDCAMS
//SYSPRINT DD  SYSOUT=A
//SYSIN    DD  *
     DEFINE USERCATALOG -
           (NAME(USERCAT1) -
           ICFCATALOG )
/*

The DEFINE USERCATALOG command defines an SMS-managed user catalog, USERCAT1. Its parameters are:

• NAME specifies the user catalog, USERCAT1.
• ICFCATALOG specifies that the user catalog is to be in the catalog format.
• All the parameters are allowed to default. The ACS routines established by the storage administrator will assign a storage class to the catalog and can assign a management class. Because the access method services space parameter is not specified, the command is unsuccessful if a default data class is not assigned to this data set.