June 2004
Intermediate to advanced
1056 pages
39h 58m
English
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Name
who
Synopsis
who [options] [file]
Displays information about the current status of the system. With no
options, lists the names of users currently logged in to the system.
An optional system file (default is
/var/run/utmp) can be supplied to give
additional information. who is usually invoked
without options, but useful options include am
i and -u. For more examples,
see cut, line,
paste, tee, and
wc.
Options
-
-H Print headings.
-
-m Report only about the current terminal.
-
-T Report whether terminals are writable (
+), not writable (-), or unknown (?).-
-u Report terminal usage (idle time). A dot (.) means less than one minute idle;
oldmeans more than 24 hours idle.-
am i Print the username of the invoking user. (Similar to results from
id.)
Example
This sample output was produced at 1:55 p.m. on January 15:
$ who -uH
USER LINE WHEN IDLE FROM
chuck console Jan 14 19:55 18:01
chuck ttyp1 Jan 15 13:11 .
chuck ttyp2 Jan 15 13:55 .The output shows that the user chuck has been idle
for 18 hours and 1 minute (18:01, under the IDLE column).
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.