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What is Linux?   Linux is the best-known and most-used open-source operating system. As an operating system, Linux is software that sits underneath all of the other software on a computer, receiving requests from those programs and relaying these requests to the computer’s hardware. Source: https://opensource.com/resources/linux What is Command-Line Interface (CLI)?     Command-line interface (CLI) is a text-based interface that is used to operate software and operating systems while allowing the user to respond to visual prompts by typing single commands into the interface and receiving a reply in the same way. Source: https://www.techopedia.com/definition/3337/command-line-interface-cli Command Line PWD     The PWD utility writes the absolute pathname of the current working directory to the standard output. Command Line  LS ls is a Linux shell command that lists directory contents of files and directories. Command Line  CD cd command in linux known as change directory command. It