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A system call is a mechanism that provides the interface between a process and the operating system. It is a programmatic method in which a computer program requests a service from the kernel of the OS. System call offers the services of the operating system to the user programs via API (Application Programming Interface). System calls are the only entry points for the kernel system.
A shell is an environment or a special user program which provide an interface to user to use operating system services. It executes programs based on the input provided by the user. It is a command line interpreter (CLI).
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