Unix is an operating system that provides a Common User Interface (CUI) for controlling a computer. Thus CUI can run an application that provides a Graphical User Interface (GUI) which makes controlling what the computer does a little easier (e.g. GNOME - The GNU Object Model Environment).
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Character User Interface or CUI is like Graphical User Interface which is used for the Input and Output of the Data in the computer, except in the GUI apart from text there are also graphical contents present, in CUI there is only use of text typed one after another just as commands used in MS DOS.
CUI and GUI are acronyms that stand for different kinds of user interface systems. These are terms used in reference to computers. CUI stands for Character User Interface while GUI refers to Graphical User Interface. Though both are interfaces and serve the purpose of running the programs, they differ in their features and the control they provide to the user.
command user interface & graphic user interface
A CUI (Console User Interface) is quicker and easier to make since it does not require all of the necessary initialization requirements that programs working in a windowed environment need.
Unix is not open source, it is proprietary. Linux is the open-source version of Unix.