Those commands are available in advance mode & in diag mode. However, you should not use those mode unless it is necessary. Those modes ususally use by NetApp technical support team or NetApp PSE.
Antway, if you wanna try out (in sim may be), type 'priv set advanced' to go to advanved mode. There u can do ls, mv etc. Type 'useradmin diaguser unlock' to unlock diag user then type 'useradmin diaguser password' to set a password to diag user. Then type 'systemshell'. Username 'diag' password is your diag password.
DONT GO TO DIAG MODE IF YOU DONT KNOW WHAT YOU ARE DOING