Some MODIFY CATALOG commands require that you supply a task address or ID, or a volume serial number or catalog name, in order to perform the desired task. The ALLOCATED and LIST parameters can be used to obtain these task identifiers.

For MODIFY CATALOG commands that require a task ID or address (ABEND, END), use the LIST parameter. For commands that require a catalog name, you can use either LIST or ALLOCATED.

The main difference between LIST and ALLOCATED is that LIST provides information about a specific task using the task's job name, ID, or storage address. ALLOCATED lists information about all catalogs allocated, even those not assigned to the catalog address space. ALLOCATED also tells you the type of cache to which a catalog is assigned.