The Linux command that: "Finds out how many users are logged onto the system" is

The Linux command that finds out how many users are logged onto the system is "who". Here are the steps to use it:

1. Open a terminal window. This is usually done by searching for "terminal" in your system's search bar.

2. Once the terminal window is open, type the following command: who

3. Press the "Enter" key.

4. The terminal will then display a list of users currently logged into the system. Each line represents a different user session.

5. To count the number of users, you can use the command who | wc -l. This will pipe the output of the who command (which lists all users) to the wc -l command (which counts the number of lines).

6. Press the "Enter" key again. The terminal will then display the number of users currently logged into the system.