OS_CLI_GUI

Candidates should be able to:

Explore the two Types of user Interface

Main questions:
Definition
Principle of operation(pros and cons)
Examples
2. Make mini notes and illustrations
3. Explain to another, listen carefully them, give feedback

The User Interface is the interaction between the User and the Machine, letting the user send commands with the expected results.

CLI is the acronym used for Command Line Interface, which are conventional interfaces extensively used in 1980’s.
A command-line interface (CLI) allows users to write commands in a terminal or console window to communicate with an operating system.
Users have to type command or train of command to perform a task. CLI’s are more accurate than GUI’s, but it requires mastery over the commands and syntax. It emphasizes over cognitive process as a primary task. CLI is appropriate for the costly computing where input precision is the priority.

Pros
CLIs can run on simple hardware with limited resources.
Some commands may be simpler to perform in a CLI than in a GUI.
Cons
CLI is suitable for the user who uses it in a regular basis and can memorize the range of commands and options.
Mistyping could result in complete chaos.
The commands can never be intuitive.
These are suitable for modelling not for the interactive graphics.

GUI expands to Graphical User Interface. A GUI uses graphics to allow users to intercommunicate with the operating system or application. GUI provides windows, scrollbars, buttons, wizards, iconic images, other icons to facilitate users. It is an easy-to-use interface for the novice users. It is intuitive, easy to learn and reduces cognitive load. Unlike CLI, GUI users need not to remember commands rather it requires recognition and good exploratory analysis and graphics.

Pros
Simple and intuitive for new users
Some commands may be simpler to perform in a GUI than in a CLI

Cons
Lack of precision.
Analysis replication and retracing of steps is hard.
Not suitable for modelling.
Difficult to design.

1. Name the two types of Operating System Interfaces

2. Give two benefits and a drawback of using a CLI

3. Give two benefits and a draw back of using a GUI

4. Why do some system administrators prefer to use Telnet (a CLI) instead of a GUI to control remote computers?

Sending text commands over the internet is very fast as very little data needs to be sent and received. Using a GUI would take up a lot of bandwidth.
Additionally, some commands might be faster to perform using a CLI than a GUI.

Conclusion

Task for student

1. https://www.powershow.com/view/400932-NzI1N/Computer_software_powerpoint_ppt_presentation2. https://en.wikibooks.org/wiki/A-level_Computing/AQA/Problem_Solving,_Programming,_Operating_Systems,_Databases_and_Networking/Operating_Systems/Role_of_the_operating_system