The Linux shell is a command-line interface(CLI) used to interact with the operating system.

The shell provides a way to execute commands, navigate/manage files, directories, and processes

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The default shell in Linux is usually Bash

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The most widely used commands in shell are:cd, cp, mv, rm, chown, chmod, ps, etc

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The shell also supports wildcards(* and ?) to help you work with multiple files at once

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Pipes (|) can also be used to connect commands together and redirect output from one command to another

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User can also customise the shell environment by setting environment variables and creating aliases for commands

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The shell provides many built-in commands and utilities and user can also extend the functionality by installing additional packages

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