$ perl install.pl 
  ___ _  _ _   _   ___         _
 / __| \| | | | | / __|_  _ __| |_ ___ _ __
| (_ | .` | |_| | \__ \ || (_-<  _/ -_) '  \
 \___|_|\_|\___/  |___/\_, /__/\__\___|_|_|_|
                       |__/
      ___         _        _ _
     |_ _|_ _  __| |_ __ _| | |___ _ _
      | || ' \(_-<  _/ _` | | / -_) '_|
     |___|_||_/__/\__\__,_|_|_\___|_|

  +-----------------------------------+
  | help | Display help informations. |
  | menu | Display the current menu.  |
  | exit | Exit this installer.       |
  +-----------------------------------+
installer> menu
  +-----------------------------------+
  | help | Display help informations. |
  | menu | Display the current menu.  |
  | exit | Exit this installer.       |
  +-----------------------------------+
installer> help
EBSCO
installer> EBSCO
Error: `EBSCO` is not a valid choice.
installer>