DragonFly On-Line Manual Pages

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
       milliseconds 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;
                           otherwise, we assume Class C (254 hosts).

               subnet/NN   Ping a different-sized local subnet: e.g.,
                           subnet/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
       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
       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 (C) 2000-2012 by Jamie Zawinski <jwz@jwz.org>
       Copyright (C) 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,
       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.

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                  5.34 (24-Oct-2015)                      sonar(6)