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UNIX is a multiuser, multitasking operating system widely used in servers, workstations, and academic environments for practical computing tasks. In practical use, UNIX provides a command-line interface called the shell, which allows users to interact directly with the system by typing commands. After logging in, the user is presented with a prompt where commands can be executed to manage files, processes, and system resources efficiently. File and directory management is a core practical aspect of UNIX. Commands such as `pwd` are used to display the present working directory, while `ls` lists the contents of a directory. Directories can be created using `mkdir` and removed ________ __________ ______ __________ _______ _____ _________ ______ __________.
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