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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Chapter 3: Linux Commands
This is the Title of the Book, eMatter Edition
Copyright © 2006 O’Reilly & Associates, Inc. All rights reserved.
Options
-a Include machines with no users logged in.
-l Include more information: tty, date, time, idle time, remote
host.
rusersd
rpc.rusersd
System administration command. Report information on users
logged into the system. Answers queries from rusers.
rwall
rwall host [file]
TCP/IP command. Use RPC to print a message to all users logged
into host.Iffile is specified, read the message from it; otherwise,
read from standard input.
rwho
rwho [option]
Report who is logged on for all machines on the local network
(similar to who). rwho depends on rwhod.
Option
-a List users even if they’ve been idle for more than one hour.
rwhod
rwhod [options]
TCP/IP command. System-status server that maintains the data-
base used by the rwho and ruptime programs. Its operation is
predicated on the ability to broadcast messages on a network. As a
producer of information, rwhod periodically queries the state of
the system and constructs status messages, which are broadcast on
a network. As a consumer of information, it listens for other rwhod
servers’ status messages, validates them, then records them in a
collection of files located in the directory /var/spool/rwho. Messages
received by the rwhod server are discarded unless they originated
at an rwhod server’s port. Status messages are ...
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