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How To Find Currently Logged in Users on Ubuntu via Command Line

Ubuntu 13

In this article, we will explore various command line methods to find out who is currently logged into an Ubuntu system. Understanding who is logged into a system is a crucial aspect of system administration, especially in multi-user environments. This information can help in resource management, system monitoring, and security.

Quick Answer

To find currently logged in users on Ubuntu via the command line, you can use the who, w, users, or ps au commands. Each command provides different levels of detail about the logged in users and their activities.

The who Command

The who command is one of the simplest ways to view the currently logged in users. By typing the command who into your terminal and pressing enter, you will see a list of usernames, terminal numbers, and login times.

who

If you want to enhance readability, you can use the -H parameter with the who command. This parameter provides a formatted output with column headers.

who -H

The w Command

The w command provides a more detailed view of the currently logged in users and their activities. By typing w into your terminal and pressing enter, you will see the username, terminal, remote host, login time, idle time, JCPU (time used by all processes attached to the tty), PCPU (time used by the current process), and the command line of the current process.

w

The users Command

The users command provides a simple list of currently logged in users. By typing users into your terminal and pressing enter, you will see a list of usernames separated by spaces.

users

The ps au Command

The ps au command provides a detailed view of the currently running processes, including the users who initiated them. By typing ps au into your terminal and pressing enter, you will see a list of usernames, terminal numbers, CPU usage, memory usage, and the command line of the current process.

ps au

Conclusion

In this article, we have covered four different command line methods to find out who is currently logged into an Ubuntu system. Each command provides a different level of detail, allowing you to choose the one that best suits your needs. By understanding who is logged into your system, you can better manage resources, monitor system usage, and maintain security.

Remember, the command line is a powerful tool for system administration. By mastering these commands, you can gain a deeper understanding of your system and its users.

For further reading on these commands and their parameters, you can refer to their man pages using the man command. For example, man who will provide a detailed explanation of the who command and its parameters.

man who

This command will open a detailed manual page for the who command, explaining all its options and how to use them. You can replace who with any other command to get its manual page.

We hope you found this article helpful. If you have any questions or comments, please feel free to leave them in the comments section below.

How can I find out who is currently logged into my Ubuntu system?

You can use the who, w, users, or ps au command to find out who is currently logged into your Ubuntu system. Each command provides different levels of detail about the logged-in users. For example, who and w commands show usernames, terminal numbers, and login times, while the users command provides a simple list of usernames. The ps au command displays currently running processes along with the users who initiated them.

How do I enhance the readability of the `who` command output?

To enhance the readability of the who command output, you can use the -H parameter. Simply type who -H into your terminal and press enter. This will provide a formatted output with column headers, making it easier to understand the information displayed.

How can I view more detailed information about the currently logged in users?

If you want more detailed information about the currently logged in users, you can use the w or ps au command. The w command provides information such as remote host, idle time, JCPU, PCPU, and the command line of the current process. The ps au command displays usernames, terminal numbers, CPU usage, memory usage, and the command line of the current process.

How can I access the manual pages for these commands?

To access the manual pages for the commands mentioned in this article, you can use the man command followed by the command you want to learn more about. For example, man who will open the manual page for the who command. This manual page provides detailed explanations of the command and its parameters. You can replace who with any other command to access its manual page.

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