Running Mac OS X Tiger: A No-Compromise Power Users Guide to the Mac (Animal Guide)

12.4. Monitoring Users

You can see who 's logged in to the machine right now using the who command, as shown in Example 12-11.

Example 12-11. Using the who command

$ who jldera console Jun 11 12:28 jldera ttyp1 Jun 11 15:04 jldera ttyp2 Jun 11 15:26 panic ttyp3 Jun 11 15:27 (localhost)

The console entry is the GUI shell that you are logged into. The ttyp entries are created by active Terminal windows.

The w command outputs a different format of this information, as shown in Example 12-12.

Example 12-12. Using the w command

$ w 15:28 up 3:07, 4 users, load averages: 0.96 0.68 0.55 USER TTY FROM LOGIN@ IDLE WHAT jldera console - 12:28 2:59 - jldera p1 - 15:04 - w jldera p2 - 15:26 1 bash panic p3 localhost 15:27 - bash

As well as listing the users logged into the system, the w command gives the system uptime and load averages on the CPU.

You can see who has been logged into the system (as well as see when the system has been rebooted) by using the last command, as shown in Example 12-13.

Example 12-13. Using the last command

$ last panic ttyp3 localhost Sat Jun 11 15:27 still logged in jldera ttyp2 Sat Jun 11 15:26 still logged in jldera ttyp2 Sat Jun 11 15:26 - 15:26 (00:00) panic console ronin.local Sat Jun 11 15:25 still logged in jldera ttyp1 Sat Jun 11 15:04 still logged in jldera ttyp1 Sat Jun 11 15:04 - 15:04 (00:00) panic console ronin.local Sat Jun 11 13:58 - 14:04 (00:06) jldera console ronin.local Sat Jun 11 12:28 - 13:58 (01:30) reboot ~ Sat Jun 11 12:21