My favorite shell keystroke saver now is tab-completion. Its wonderful that it works for things besides files. eg `systemctl iso<tab>` gives 'systemctl isolate`

My favorite shell keystroke saver now is tab-completion. Its wonderful that it works for things besides files. eg `systemctl iso<tab>` gives 'systemctl isolate` Its great but it could be even better. For example if there is ambiguity the possible choices are shown but not as a menu.