You do not always have to remember or type the full command or option name for the CLI to recognize it. To display all possible command or option completions, type the partial command followed immediately by a question mark (?).
To complete a command or option that you have partially typed, press Tab or Spacebar. If the partially typed letters uniquely identify a command, the complete command name appears. Otherwise, a message indicates that your entry is ambiguous or invalid. Possible command completions are displayed if your entry is ambiguous.
You can also use command completion on filenames and usernames. To display all possible values, type one or more characters followed immediately by a question mark. To complete these partial entries, press Tab only. Pressing Spacebar does not work.