July 2005
Intermediate to advanced
944 pages
158h 24m
English
book
Linux in a Nutshell, Fifth Edition
by Ellen Siever, Aaron Weber, Stephen Figgins, Robert Love, Arnold Robbins
Content preview from Linux in a Nutshell, Fifth Edition
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warnquota | 501
Linux
Commands
This is the Title of the Book, eMatter Edition
Copyright © 2006 O’Reilly & Associates, Inc. All rights reserved.
w
w [options] [user]
Print summaries of system usage, currently logged-in users, and
what those users are doing. w is essentially a combination of
uptime, who, and ps -a. Display output for one user by specifying
user.
Options
-f Toggle printing the from (remote hostname) field.
-h Suppress headings and uptime information.
-s Use the short format.
-u Ignore the username while figuring out the current process
and CPU times.
-V Display version information.
File
/var/run/utmp
List of users currently logged in.
wall
wall [file]
wall [-n] [message]
Write to all users. Depending on your Linux distribution, wall uses
one of the two syntaxes shown. In both versions, the default is for
wall to read a message from standard input and send the message
to all users currently logged in, preceded by “Broadcast Message
from...” With the first syntax, which comes with Debian, for
example, if file is specified, wall reads input from that file rather
than from standard input, and only the superuser can write to a
terminal if the user has disallowed messages. With the second
syntax, distributed by Red Hat, for example, the text of the
message can be included on the command line, and the message is
limited to 20 lines. In this form, if -n is specified, the default banner
message is replaced ...
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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.