any specific completion defined
      -E	apply the completions and actions to "empty" commands --
    		completion attempted on a blank line
      -I	apply the completions and actions to the initial (usually the
    		command) word
    
    When completion is attempted, the actions are applied in the order the
    uppercase-letter options are listed above. If multiple options are supplied,
    the -D option takes precedence over -E, and both take precedence over -I.
    
    Exit Status:
    Returns success unless an invalid option is supplied or an error occurs.