While you are typing in the command window, if you hit "TAB", you will see the possible completions (but you need to have typed it correctly thus far).
After you try to enter a command, if it is incorrect (like "lumread"), then MATLAB may try to guess your intention, and offer something like
Did you mean:
>> dlmread
and you can just hit ENTER if it were what you intended.
I don't know if that is configurable.
If you tend to typo a particular command often, you could make a file that redirects that to the correct command.
