Provided by: xscreensaver-data-extra_5.08-0ubuntu5_i386
sonar - display a sonar scope
sonar [-ping hosts-or-subnets] [-ping-timeout int] [-delay usecs]
[-speed ratio] [-sweep-size ratio] [-font-size points] [-team-a-name
string] [-team-b-name string] [-team-a-count int] [-team-b-count int]
[-no-dns] [-no-times] [-no-wobble] [-debug] [-fps]
This draws a sonar screen that pings (get it?) the hosts on your local
network, and plots their distance (response time) from you. The three
rings represent ping times of approximately 2.5, 70 and 2,000
Alternately, it can run a simulation that doesn’t involve hosts.
sonar understands the following options:
The list of things to ping, separated by commas or spaces.
Elements of this list may be:
simulation Run in simulation mode instead of pinging real
hostname Ping the given host.
A.B.C.D Ping the given IP address.
subnet Ping the local class C subnet (the nearest 255
subnet/NN Ping a different-sized local subnet: e.g.,
subnet/28 would ping a 4-bit subnet (the nearest 15
A.B.C.D/NN Ping an arbitrary other subnet. The IP address
specifies the base address, and the part after the
slash is how wide the subnet is. Typical values
are /24 (for 255 addresses) and /28 (for 15
filename Ping the hosts listed in the given file. This file
can be in the format used by /etc/hosts, or it can
be any file that has host names as the first or
second element on each line. If you use ssh, try
sonar -ping $HOME/.ssh/known_hosts
The amount of time in milliseconds the program will wait for an
answer to a ping.
Delay between frames, in microseconds. Default 20000.
Less than 1 for slower, greater than 1 for faster. Default 1.
How big the glowing sweep area should be. Default 0.3.
How large the text should be. Default 10 points.
Keep the display stationary instead of very slowly wobbling
back and forth.
-no-dns Do not attempt to resolve IP addresses to hostnames.
Do not display ping times beneath the host names.
In simulation mode, the name of team A.
In simulation mode, the name of team B.
In simulation mode, the number of bogies on team A.
In simulation mode, the number of bogies on team B.
-fps Display the current frame rate, polygon count, and CPU load.
On most Unix systems, this program must be installed as setuid root in
order to ping hosts. This is because root privileges are needed to
create an ICMP RAW socket. Privileges are disavowed shortly after
startup (just after connecting to the X server) so this is believed to
chown root:root sonar
chmod u+s sonar
It is not necessary to make it setuid on MacOS systems, because on
MacOS, unprivileged programs can ping by using ICMP DGRAM sockets
instead of ICMP RAW.
In ping-mode, the display is a logarithmic scale, calibrated so that
the three rings represent ping times of approximately 2.5, 70 and 2,000
This means that if any the hosts you are pinging take longer than 2
seconds to respond, they won’t show up; and if you are pinging several
hosts with very fast response times, they will all appear close to the
center of the screen (making their names hard to read.)
X(1), xscreensaver(1), ping(8)
Copyright © 2000-2008 by Jamie Zawinski <email@example.com>
Copyright © 1998 by Stephen Martin. <firstname.lastname@example.org>
Permission to use, copy, modify, distribute, and sell this software and
its documentation for any purpose is hereby granted without fee,
provided that the above copyright notice appear in all copies and that
both that copyright notice and this permission notice appear in
supporting documentation. No representations are made about the
suitability of this software for any purpose. It is provided "as is"
without express or implied warranty.
Stephen Martin <email@example.com>, 3-nov-1998.
Subnet support, etc. added by Jamie Zawinski, 17-Jul-2000.
Rewritten using OpenGL instead of X11 by Jamie Zawinski, 12-Aug-2008.