sonar man page on Mageia
[printable version]
sonar(6) XScreenSaver manual sonar(6)
NAME
sonar - display a sonar scope
SYNOPSIS
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]
DESCRIPTION
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 millisec‐
onds respectively.
Alternately, it can run a simulation that doesn't involve hosts.
OPTIONS
sonar understands the following options:
-ping hosts-or-subnets
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
hosts.
hostname Ping the given host.
A.B.C.D Ping the given IPv4 address.
subnet Ping the local subnet. On systems where we can
determine the local network mask, we use that; oth‐
erwise, we assume Class C (254 hosts).
subnet/NN Ping a different-sized local subnet: e.g., sub‐
net/28 would ping a 4-bit subnet (the nearest 14
addresses). On systems where we can determine the
local network mask, we always use that.
A.B.C.D/NN Ping an arbitrary other IPv4 subnet. The address
specifies the base address, and the part after the
slash is how wide the subnet is. Typical values
are /24 (for 254 addresses) and /28 (for 14
addresses).
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
this:
sonar -ping $HOME/.ssh/known_hosts
-ping-timeout int
The amount of time in milliseconds the program will wait for an
answer to a ping.
-delay int
Delay between frames, in microseconds. Default 20000.
-speed ratio
Less than 1 for slower, greater than 1 for faster. Default 1.
-sweep-size ratio
How big the glowing sweep area should be. Default 0.3.
-font-size points
How large the text should be. Default 10 points.
-no-wobble
Keep the display stationary instead of very slowly wobbling
back and forth.
-no-dns Do not attempt to resolve IP addresses to hostnames.
-no-times
Do not display ping times beneath the host names.
-team-a-name string
In simulation mode, the name of team A.
-team-b-name string
In simulation mode, the name of team B.
-team-a-count int
In simulation mode, the number of bogies on team A.
-team-b-count int
In simulation mode, the number of bogies on team B.
-fps Display the current frame rate, polygon count, and CPU load.
NOTES
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
be safe:
chown root:root sonar
chmod u+s sonar
It is not necessary to make it setuid on MacOS systems, because on Mac‐
OS, 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
milliseconds respectively.
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.)
BUGS
Does not support IPv6.
SEE ALSO
X(1), xscreensaver(1), ping(8), ping6(8)
COPYRIGHT
Copyright © 2000-2012 by Jamie Zawinski <jwz@jwz.org>
Copyright © 1998 by Stephen Martin. <smartin@canada.com>
Permission to use, copy, modify, distribute, and sell this software and
its documentation for any purpose is hereby granted without fee, pro‐
vided that the above copyright notice appear in all copies and that
both that copyright notice and this permission notice appear in sup‐
porting documentation. No representations are made about the suitabil‐
ity of this software for any purpose. It is provided "as is" without
express or implied warranty.
AUTHORS
Stephen Martin <smartin@canada.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.
X Version 11 5.26 (09-Dec-2013) sonar(6)
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