w

Show who is logged on and what they are doing. Print user login, TTY, remote host, login time, idle time, current process. More information: https://keith.github.io/xcode-man-pages/w.1.html.

Show logged-in users information:

w

Show logged-in users information without a header:

w -h

Show information about logged-in users, sorted by their idle time:

w -i