whonaylor ttyZ1 Nov 6 08:25 hal ttyp0 Oct 20 16:04 (zebra.ora.com:0.) pmui ttyp1 Nov 4 17:21 (dud.ora.com:0.0) jpeek ttyp2 Nov 5 23:08 (jpeek.com) hal ttyp3 Oct 28 15:43 (zebra.ora.com:0.) ...
Each line shows a different terminal or window. The columns show the username logged on, the number, the login time, and, if the user is coming in via a , you'll see (in parentheses) their location. The user hal is logged on twice, for instance.
It's handy to search the output of who with- especially on systems with a lot of users. For example:
|who||The GNU who, on the CD-ROM, has more features than some other versions.|