The w command (literally a lower-case 'W') shows the uptime of the system as well as the users who are logged on and certain details about them.
mail# w 4:00PM up 95 days, 16:48, 2 users, load averages: 0.00, 0.00, 0.00 USER TTY FROM LOGIN@ IDLE WHAT glyn p0 126.96.36.199 Fri10AM - w glyn p1 192.168.100.4 Sat09AM 15:59 _su (csh)
This shows the uptime of the system in the same format as the uptime command (see that article for details). The lines following it show:
- USER - who is logged onto the system;
- TTY - terminal session;
- FROM - remote host name or IP address of the user;
- LOGIN@ - The time of logging on;
- IDLE - time since the user typed anything;
- WHAT - current command being run and its parameters (if any).
See also uptime command.