DFSMShsm commands can be issued from the operator’s console, from a TSO terminal, as a CLIST from a TSO terminal, as a job (when properly surrounded by JCL) from the batch reader, or from a PARMLIB member. DFSMShsm commands can be up to 1024 bytes long. The z/OS DFSMShsm Storage Administration explains how to issue the DFSMShsm commands and why to issue them.