Linux Tactic

Find Out Who’s Logged In: A Guide to Listing Users in Linux

Listing Logged in Users in Linux

Linux is an operating system that is widely used in various fields. One of the most important features of the Linux operating system is its command-line interface.

The command-line interface provides

users with an easy and efficient way to interact with the system. In this article, we will be exploring how to list logged in

users in Linux using various commands and tools.

Commands to see logged in

users on Linux

The Linux operating system provides various commands that can be used to view the current status of the system. One of the most popular commands to see logged in

users in Linux is the ‘w’ command.

The ‘w’ command provides detailed information about the

users that are currently logged in, their terminal sessions, hostnames, and more. To use the ‘w’ command, open the terminal and type ‘w’ without the quotes.

The output will show all the

users that are currently logged in, their terminals, and the time they have been active. The output will also display the load average of the system.

Using w command to see logged in

users in Linux

The ‘w’ command provides extensive information about the

users that are currently logged in. The output may sometimes be too lengthy, making it difficult to track down specific user information.

To get a shorter and cleaner output of only the logged-in user names, use the ‘cut’ command. To display only the user names open the terminal and enter the following:

w | cut -d ” ” -f 1 | grep -v USER | sort | uniq

This command pipes the output of ‘w’ into the ‘cut’, ‘grep’, and ‘sort’ commands.

The ‘cut’ command extracts the first field of the output, which is the username. The ‘grep’ command filters out the ‘USER’ header, while the ‘sort’ and ‘uniq’ commands remove any duplicate entries.

Checking

who is logged in with

who command

Another useful command to see

who is currently logged in on the system is the ‘

who’ command. The ‘

who’ command displays a list of all the

users that are currently logged in, along with their terminal sessions and login times.

To use the ‘

who’ command, open the terminal and enter the following command:

who

The output will display a list of all the

users that are currently logged in. The output includes the username, terminal session, date, and time of the login.

Using

users command to get only logged in user names

The ‘

users’ command provides a simple way to list all the currently logged in user names. Unlike the ‘w’ command, the ‘

users’ command focuses only on the user names and produces a shorter and cleaner output.

To use the ‘

users’ command, open the terminal and enter the following command:

users

The output will list all the currently logged in user names. Using

finger command to see logged in

users

The ‘

finger’ command provides a simple way to list all the currently logged in

users on the system.

The ‘

finger’ command is less popular than the ‘w’ and ‘

who’ commands but is still a useful tool to list all the current

users and view information such as the user’s name, terminal session, login time, and the time since the user

last interacted with the system. To use the ‘

finger’ command, open the terminal and enter the following command:

finger

The output will display all the currently logged in

users and their login details. Bonus tip: Seeing

who logged on since

last reboot with

last command

The ‘

last’ command is a useful tool that provides information about all the previous login sessions.

The ‘

last’ command displays a list of all the

users that have logged in since the

last system reboot. The output includes important details such as the user name, terminal session, login time, and login duration.

To use the ‘

last’ command, open the terminal and enter the following command:

last

The output will display a list of all the

users that have logged in since the

last system reboot.

Conclusion

In conclusion, the Linux operating system provides various tools and commands to list all the currently logged in

users. The ‘w’, ‘

who’, ‘

users’, and ‘

finger’ commands are some of the commonly used commands.

The ‘

last’ command provides information about all the previous login sessions. By using these tools, system administrators and

users can quickly identify

who is currently using the system and their login details.

Command:

who

The ‘

who’ command is a utility that is used to display the list of

users

who are currently logged in to the system. It not only displays the

users

who are logged in but also shows the duration of their session and the terminal they are using.

It also shows the IP address of the user’s device and the time they logged in. The ‘

who’ command is particularly helpful for system administrators

who need to monitor the activities of

users

who are connected to their systems.

It allows them to keep track of user logins and logouts, as well as the duration of each session. To use the ‘

who’ command, open the terminal and type ‘

who’ without the quotes.

The output is displayed in multiple columns like username, terminal, date, and time. It provides you with a quick snapshot of

who is currently logged into the system.

The ‘

who’ command also has various options that can be used to customize the output. For example, you can use the ‘-q’ option to show only the number of logged-in

users, and you can use ‘-T’ to specify the timeout period for idle

users.

Command:

users

The ‘

users’ command is another utility that is used to display the list of

users

who are currently logged in to the system. However, unlike the ‘

who’ command that displays user details such as the terminal, date, and time, the ‘

users’ command simply provides a list of logged-in user names.

The ‘

users’ command is particularly helpful for quick snapshots of the currently active

users in a system. The output produced by the ‘

users’ command is simple, easy to read, and shows only the usernames of currently logged-in

users.

To use the ‘

users’ command, open the terminal and type ‘

users’ without the quotes. The output will display a list of the currently logged-in

users.

It is important to note that although the ‘

users’ command provides a simple and quick way to display the currently active

users in a system, it may not provide enough information to properly monitor the user’s activities. For a more detailed view of user activities, the ‘

who’ command is recommended.

Summary

In summary, the Linux operating system provides several tools and utilities that can be used to display the list of logged-in

users and their activities in a system. The ‘

who’ command and ‘

users’ command are two such utilities that are commonly used.

The ‘

who’ command provides a more detailed view of user activities, while the ‘

users’ command provides a quick summary of currently active

users. These commands are particularly useful for system administrators

who need to monitor user activities to ensure system security and optimal performance.

Command:

finger

The ‘

finger’ command is a utility that is used to display detailed information about the logged-in

users of a system. It provides useful information about each user, such as their real name, login name, idle time, and the terminal they are using.

To use the ‘

finger’ command, simply open the terminal and type ‘

finger’ followed by the username of the user

whose information you want to view, or you can enter ‘

finger’ without any arguments to display the details of all the currently logged-in

users. The output created by the ‘

finger’ command is simple, clean, and easy to read.

It provides you with all the necessary information about each user, such as their full name, login name, current terminal, and idle time. The command also shows the login time and the duration of the user’s session.

Keep in mind that the use of the ‘

finger’ command is not as secure as other commands, as it provides detailed information about the

users, which could make it easier for attackers to identify vulnerabilities in the system. As such, it is recommended to have it disabled by default in most Linux distributions.

Command:

last

The ‘

last’ command is used to display the details of

users

who have logged in or out of the system. By default, the ‘

last’ command shows the details of all the user logins and logouts since the

last reboot.

The information provided by the ‘

last’ command includes the login name, terminal, IP address of the device, and the login time. It is especially useful for system administrators

who need to view the history of user logins and logouts to maintain the security of the system.

To use the ‘

last’ command, open the terminal and type ‘

last’ without the quotes. By default, the command will display the details of all the

users

who have logged in or out since the

last reboot.

The ‘

last’ command can also be used with various options to obtain more specific information. For example, the ‘-n’ option can be used to display the

last n activity logs.

The ‘-a’ option can be used to display all information for the user logins and the ‘-i’ option can display the IP addresses of the connected devices.

Conclusion

In Linux, there are several commands and utilities that can be used to display the status of logged-in

users. The ‘

finger’ command provides detailed information about

users

who are currently logged in, such as their full name, login name, current terminal, and idle time.

The ‘

last’ command displays the history of user logins and logouts, making it an essential tool for system administrators

who need to monitor user activities. These commands can help system administrators and

users to track the activities of logged-in

users to ensure that the system is used optimally and securely.

It is important to note that the use of these commands does come with some security risks, and should be used with caution to prevent unauthorized access to the system. In conclusion, Linux provides several commands, including ‘w’, ‘

who’, ‘

users’, ‘

finger’, and ‘

last’, that are essential for listing logged in

users.

The ‘w’ command offers detailed information on current

users, while the ‘

who’ command provides a quick snapshot of logged in

users. The ‘

users’ command gives a simple list of user names, and the ‘

finger’ command displays user details.

Lastly, the ‘

last’ command shows the login history since the

last reboot. Monitoring logged in

users is crucial for system administrators to ensure system security and performance.

By using these commands, administrators can effectively track and manage user activities, maintaining the integrity of the system.

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