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Shell: An outer protection tool for the kernel and responsible for user interaction with the kernel;

Provides an interface for user interaction with the kernel, receiving shell commands entered by the user and sending them to the kernel for execution.

Is a command line interpreter that interprets commands entered by the user and sends them to the kernel for execution.

A human-computer interface that issues commands to the operating system through a series of shell commands.

The most common is the terminal.

terminal: terminal used to start the shell environment.

Shell commands: Users initiate control requests to the system kernel.

Shell Script: An ordered collection of shell commands.

bash: There are many kinds of shells in Linux, bash is one of them.

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