A captive user interface or CUI is a style of interaction with an application that exists outside the scope of the highest level command interpreter present on the system.Once you invoke an application from command interpreter , it is not possible to communicate with the command interpreter until the application exists.
Ex :
$ mail command for mailing
;;
$ exit
$ grep(searching) command
;;
$
Ex :
$ mail command for mailing
;;
$ exit
$ grep(searching) command
;;
$
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