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IBM has kept their commands fairly consistent throughout the different classes. For instance, if you want to view something, the command will probably start with "ls," short for "list." lsps will list paging space on the system, lsuser will list user information, etc.
The prefixes are as follows:
ls = List something (lsps, lsuser, lscfg, etc)
rm = Remove something (rmuser)
ch = Change something (chown, chuser, chmod)
If nothing else, "smit" or "smitty" has most basic tasks and some more advanced tasks that a system administrator will perform.