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These directories are organized into a tree-like structure called the filesystem. You can use the ls command to list out all the files or directories available in a directory. Following is the example of using ls command with -l option. Here entries starting with d For example, uml, univ and urlspedia are directories and rest of the entries are files.

Try it on your system. This command lists the account name associated with the current login. You can try who am i command as well to get information about yourself.

There are three commands available to get you this information, based on how much you wish to know about the other users: users , who , and w. Try the w command on your system to check the output. This lists down information associated with the users logged in the system.

When you finish your session, you need to log out of the system. This is to ensure that nobody else accesses your files. Just type the logout command at the command prompt, and the system will clean up everything and break the connection. Powers off the system using predefined scripts to synchronize and clean up the system prior to shutting down.

You typically need to be the super user or root the most privileged account on a Unix system to shut down the system. However, on some standalone or personally-owned Unix boxes, an administrative user and sometimes regular users can do so.

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