Who's On?

The who command lists the users logged on to the system now. Here's an example of the output on my system:

% 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 () number, the login time, and, if the user is coming in via a network (), 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 grep ()- especially on systems with a lot of users. For example:

 -v 

% who | grep "^hal " where is hal logged on? % who | grep "Nov 6" who logged on today? % who | grep -v "Nov 6" who logged on before today? ...

- JP