Although DFSMShsm performs most of its functions automatically, you may at times want to perform some of the functions for your data sets by command. DFSMShsm provides a set of commands that unauthorized users can issue to manage their own data sets. SMS provides controls in the management classes that allow or disallow management of data sets by command. If your data sets are associated with a management class that disallows space management or availability management by command, you cannot issue these commands for those data sets. In addition, DFSMShsm provides a command that authorized users can use to issue DFSMShsm commands from TSO.

Many computing centers use security programs to protect users data sets from being deleted, changed, or read by unauthorized people. DFSMShsm honors both password and RACF® protection for data sets.