System utility programs are used to list or change information that is related to data sets and volumes, such as data set names, catalog entries, and volume labels. Most functions that system utility programs can perform are performed more efficiently with other programs, such as IDCAMS, ISMF, or DFSMSrmm
ICKDSF - Install and manage DASD volumes
The ICKDSF utility performs functions needed for the installation, use, and maintenance of IBM® direct-access storage devices (DASD). You also can use it to perform service functions, error detection, and media maintenance.
IEHINITT - Initialize tape devices
IEHINITT is a system utility used to place standard volume label sets onto any number of magnetic tapes mounted on one or more tape units. Many larger z/OS installations do not allow unlabeled tapes to be brought into the installation.
IEHLIST - List system data
IEHLIST is a system utility used to list entries in the directory of one or more partitioned data sets or PDSEs, or entries in an indexed or non-indexed volume table of contents (VTOC).
IEHPROGM - Manage catalogs and data sets
The IEHPROGM utility is used primarily to manage catalogs, rename data sets, and delete data sets. Most of the IEHPROGM functions are available through access method services (the IDCAMS utility), which is now the preferred utility for catalog and data set functions.
SPZAP (a.k.a. Superzap) - Dynamically update programs or data
The SPZAP service aid has several aliases, including AMASPZAP and Superzap, the latter being the most commonly used. SPZAP allows you to patch or fix volume table of contents (VTOCs), executable programs, or almost any other disk record. In practice, it is used most frequently to patch executable programs.
We explanied some of the important utilities in next chapter...
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