2.8. Who's On?
% who naylor 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 tty (Section 2.7) number, the login time, and, if the user is coming in via a network (Section 1.21), you'll see their location (in parentheses). The user hal is logged on twice, for instance.
It's handy to search the output of who with grep (Section 13.1) -- especially on systems with a lot of users. For example:
% who | grep "^hal " ...where is hal logged on? % who | grep "Nov 6" ...who logged on today?
-v Section 13.3
% who | grep -v "Nov 6" ...who logged on before today? ...
The GNU who, on the CD-ROM [see http://examples.oreilly.com/upt3], has more features than some other versions.
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