1sonar(6x) XScreenSaver manual sonar(6x)
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6 sonar - display a sonar scope
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9 sonar [-ping hosts-or-subnets] [-ping-timeout int] [-delay usecs]
10 [-speed ratio] [-sweep-size ratio] [-font-size points] [-team-a-name
11 string] [-team-b-name string] [-team-a-count int] [-team-b-count int]
12 [-no-dns] [-no-times] [-no-wobble] [-debug] [-fps]
13
15 This draws a sonar screen that pings (get it?) the hosts on your local
16 network, and plots their distance (response time) from you. The three
17 rings represent ping times of approximately 2.5, 70 and 2,000 millisec‐
18 onds respectively.
19 Alternately, it can run a simulation that doesn't involve hosts.
21
23 sonar understands the following options:
24 -ping hosts-or-subnets
26 The list of things to ping, separated by commas or spaces.
27 Elements of this list may be:
28 simulation Run in simulation mode instead of pinging real
30 hosts.
31 hostname Ping the given host.
33 A.B.C.D Ping the given IPv4 address.
35 subnet Ping the local subnet. On systems where we can
37 determine the local network mask, we use that; oth‐
38 erwise, we assume Class C (254 hosts).
39 subnet/NN Ping a different-sized local subnet: e.g., sub‐
41 net/28 would ping a 4-bit subnet (the nearest 14
42 addresses). On systems where we can determine the
43 local network mask, we always use that.
44 A.B.C.D/NN Ping an arbitrary other IPv4 subnet. The address
46 specifies the base address, and the part after the
47 slash is how wide the subnet is. Typical values
48 are /24 (for 254 addresses) and /28 (for 14
49 addresses).
50 filename Ping the hosts listed in the given file. This file
52 can be in the format used by /etc/hosts, or it can
53 be any file that has host names as the first or
54 second element on each line. If you use ssh, try
55 this:
56 sonar -ping $HOME/.ssh/known_hosts
58 -ping-timeout int
60 The amount of time in milliseconds the program will wait for an
61 answer to a ping.
62 -delay int
64 Delay between frames, in microseconds. Default 20000.
65 -speed ratio
67 Less than 1 for slower, greater than 1 for faster. Default 1.
68 -sweep-size ratio
70 How big the glowing sweep area should be. Default 0.3.
71 -font-size points
73 How large the text should be. Default 10 points.
74 -no-wobble
76 Keep the display stationary instead of very slowly wobbling
77 back and forth.
78 -no-dns Do not attempt to resolve IP addresses to hostnames.
80 -no-times
82 Do not display ping times beneath the host names.
83 -team-a-name string
85 In simulation mode, the name of team A.
86 -team-b-name string
88 In simulation mode, the name of team B.
89 -team-a-count int
91 In simulation mode, the number of bogies on team A.
92 -team-b-count int
94 In simulation mode, the number of bogies on team B.
95 -fps Display the current frame rate, polygon count, and CPU load.
97
99 On most Unix systems, this program must be installed as setuid root in
100 order to ping hosts. This is because root privileges are needed to
101 create an ICMP RAW socket. Privileges are disavowed shortly after
102 startup (just after connecting to the X server) so this is believed to
103 be safe:
104 chown root:root sonar
105 chmod u+s sonar
106 It is not necessary to make it setuid on MacOS systems, because on Mac‐
107 OS, unprivileged programs can ping by using ICMP DGRAM sockets instead
108 of ICMP RAW.
109 In ping-mode, the display is a logarithmic scale, calibrated so that
111 the three rings represent ping times of approximately 2.5, 70 and 2,000
112 milliseconds respectively.
113 This means that if any the hosts you are pinging take longer than 2
115 seconds to respond, they won't show up; and if you are pinging several
116 hosts with very fast response times, they will all appear close to the
117 center of the screen (making their names hard to read.)
118
120 Does not support IPv6.
121
123 X(1), xscreensaver(1), ping(8), ping6(8)
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126 Copyright © 2000-2012 by Jamie Zawinski <jwz@jwz.org>
127 Copyright © 1998 by Stephen Martin. <smartin@canada.com>
128 Permission to use, copy, modify, distribute, and sell this software and
130 its documentation for any purpose is hereby granted without fee, pro‐
131 vided that the above copyright notice appear in all copies and that
132 both that copyright notice and this permission notice appear in sup‐
133 porting documentation. No representations are made about the suitabil‐
134 ity of this software for any purpose. It is provided "as is" without
135 express or implied warranty.
136
139 Stephen Martin <smartin@canada.com>, 3-nov-1998.
140 Subnet support, etc. added by Jamie Zawinski, 17-Jul-2000.
142 Rewritten using OpenGL instead of X11 by Jamie Zawinski, 12-Aug-2008.
144X Version 11 5.45-1.fc33 (10-Dec-2020) sonar(6x)