Displays a compact list of the users currently on the system.
users [ File ]
The users command lists the login names of the users currently on the system to standard output (stdout) in a compact, one-line list format. If an argument is given, it is used as an alternate file instead of /etc/utmp.
| /etc/utmp | Contains list of current users. |
| /usr/bin/users | Contains the users command. |
The who command.