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.