If you specify DATASETNAME without dsname or specify LEVEL without a qualifier, DFSMShsm lists all the data set entries that have your user identification as the set of initial characters of the data set name.

If you do not specify the parameters MIGRATIONVOLUME, PRIMARYVOLUME, VOLUME, USER, BACKUPVOLUME, DATASETNAME, or LEVEL, DFSMShsm lists all the data set entries that have your user identification as the set of initial characters of the data set name.