A shell is a computer program which exposes an operating system's services to a human user or other program. In general, operating system shells use either a command-line interface or graphical user interface, depending on a computer's role and particular operation.
Cyber security is the application of technologies, processes and controls to protect systems, networks, programs, devices and data from cyber attacks. It aims to reduce the risk of cyber attacks and protect against the unauthorised exploitation of systems, networks and technologies.
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