ntpq(1) Programmer's Manual ntpq(1)
NAME
ntpq - standard NTP query program
SYNOPSIS
ntpq [-flag [value]]... [--opt-name [[=| ]value]]...
[ host ...]
DESCRIPTION
This manual page briefly documents the ntpq command. The [= prog-name
=] utility program is used to query NTP servers which implement the
standard NTP mode 6 control message formats defined in Appendix B of
the NTPv3 specification RFC1305, requesting information about current
state and/or changes in that state. The same formats are used in
NTPv4, although some of the variables have changed and new ones added.
The description on this page is for the NTPv4 variables. The program
may be run either in interactive mode or controlled using command line
arguments. Requests to read and write arbitrary variables can be
assembled, with raw and pretty-printed output options being available.
The [= prog-name =] utility can also obtain and print a list of peers
in a common format by sending multiple queries to the server.
If one or more request options is included on the command line when [=
prog-name =] is executed, each of the requests will be sent to the NTP
servers running on each of the hosts given as command line arguments,
or on localhost by default. If no request options are given, [= prog-
name =] will attempt to read commands from the standard input and exe-
cute these on the NTP server running on the first host given on the
command line, again defaulting to localhost when no other host is spec-
ified. The [= prog-name =] utility will prompt for commands if the
standard input is a terminal device.
The [= prog-name =] utility uses NTP mode 6 packets to communicate with
the NTP server, and hence can be used to query any compatible server on
the network which permits it. Note that since NTP is a UDP protocol
this communication will be somewhat unreliable, especially over large
distances in terms of network topology. The [= prog-name =] utility
makes one attempt to retransmit requests, and will time requests out if
the remote host is not heard from within a suitable timeout time.
Specifying a command line option other than or will cause the specified
query (queries) to be sent to the indicated host(s) immediately. Oth-
erwise, [= prog-name =] will attempt to read interactive format com-
mands from the standard input. Interactive format commands consist of
a keyword followed by zero to four arguments. Only enough characters
of the full keyword to uniquely identify the command need be typed.
A number of interactive format commands are executed entirely within
the [= prog-name =] utility itself and do not result in NTP mode 6
requests being sent to a server. These are described following.
? [command_keyword]
A by itself will print a list of all the command keywords known to this
incarnation of [= prog-name =] . A followed by a command keyword will
print function and usage information about the command. This command
is probably a better source of information about [= prog-name =] than
this manual page.
addvars
rmvars variable_name ...
clearvars The data carried by NTP mode 6 messages consists of a list of
items of the form where the is ignored, and can be omitted, in requests
to the server to read variables. The [= prog-name =] utility maintains
an internal list in which data to be included in control messages can
be assembled, and sent using the and commands described below. The
command allows variables and their optional values to be added to the
list. If more than one variable is to be added, the list should be
comma-separated and not contain white space. The command can be used
to remove individual variables from the list, while the command removes
all variables from the list.
authenticate [ yes | no ] Normally [= prog-name =] does not authenti-
cate requests unless they are write requests. The command causes [=
prog-name =] to send authentication with all requests it makes.
Authenticated requests causes some servers to handle requests slightly
differently, and can occasionally melt the CPU in fuzzballs if you turn
authentication on before doing a display. The command causes [= prog-
name =] to display whether or not [= prog-name =] is currently authein-
ticating requests.
cooked Causes output from query commands to be "cooked", so that vari-
ables which are recognized by [= prog-name =] will have their values
reformatted for human consumption. Variables which [= prog-name =]
thinks should have a decodable value but didn't are marked with a
trailing ] With no argument, displays the current debug level. Other-
wise, the debug level is changed to the indicated level.
delay milliseconds Specify a time interval to be added to timestamps
included in requests which require authentication. This is used to
enable (unreliable) server reconfiguration over long delay network
paths or between machines whose clocks are unsynchronized. Actually
the server does not now require timestamps in authenticated requests,
so this command may be obsolete.
host hostname Set the host to which future queries will be sent. Host-
name may be either a host name or a numeric address.
hostnames Cm yes | Cm no If is specified, host names are printed in
information displays. If is specified, numeric addresses are printed
instead. The default is unless modified using the command line switch.
keyid keyid This command allows the specification of a key number to be
used to authenticate configuration requests. This must correspond to a
key number the server has been configured to use for this purpose.
ntpversion [ ] Sets the NTP version number which [= prog-name =] claims
in packets. Defaults to 3, Note that mode 6 control messages (and
modes, for that matter) didn't exist in NTP version 1. There appear to
be no servers left which demand version 1. With no argument, displays
the current NTP version that will be used when communicating with
servers.
quit Exit [= prog-name =] .
passwd This command prompts you to type in a password (which will not
be echoed) which will be used to authenticate configuration requests.
The password must correspond to the key configured for use by the NTP
server for this purpose if such requests are to be successful.
raw Causes all output from query commands is printed as received from
the remote server. The only formating/interpretation done on the data
is to transform nonascii data into a printable (but barely understand-
able) form.
timeout Ar milliseconds Specify a timeout period for responses to
server queries. The default is about 5000 milliseconds. Note that
since [= prog-name =] retries each query once after a timeout, the
total waiting time for a timeout will be twice the timeout value set.
OPTIONS
-4, --ipv4
Force IPv4 DNS name resolution. This option must not appear in
combination with any of the following options: ipv6.
Force DNS resolution of following host names on the command line
to the IPv4 namespace.
-6, --ipv6
Force IPv6 DNS name resolution. This option must not appear in
combination with any of the following options: ipv4.
Force DNS resolution of following host names on the command line
to the IPv6 namespace.
-c cmd, --command=cmd
run a command and exit. This option may appear an unlimited
number of times.
The following argument is interpreted as an interactive format
command and is added to the list of commands to be executed on
the specified host(s).
-d, --debug-level
Increase output debug message level. This option may appear an
unlimited number of times.
Increase the debugging message output level.
-D string, --set-debug-level=string
Set the output debug message level. This option may appear an
unlimited number of times.
Set the output debugging level. Can be supplied multiple times,
but each overrides the previous value(s).
-p, --peers
Print a list of the peers. This option must not appear in com-
bination with any of the following options: interactive.
Print a list of the peers known to the server as well as a sum-
mary of their state. This is equivalent to the 'peers' interac-
tive command.
-i, --interactive
Force ntpq to operate in interactive mode. This option must not
appear in combination with any of the following options: com-
mand, peers.
Force ntpq to operate in interactive mode. Prompts will be
written to the standard output and commands read from the stan-
dard input.
-n, --numeric
numeric host addresses.
Output all host addresses in dotted-quad numeric format rather
than converting to the canonical host names.
--old-rv
Always output status line with readvar.
By default, ntpq now suppresses the associd=... line that pre-
cedes the output of "readvar" (alias "rv") when a single vari-
able is requested, such as ntpq -c "rv 0 offset". This option
causes ntpq to include both lines of output for a single-vari-
able readvar. Using an environment variable to preset this
option in a script will enable both older and newer ntpq to
behave identically in this regard.
-?, --help
Display extended usage information and exit.
-!, --more-help
Extended usage information passed thru pager.
-> [rcfile], --save-opts[=rcfile]
Save the option state to rcfile. The default is the last con-
figuration file listed in the OPTION PRESETS section, below.
-< rcfile, --load-opts=rcfile, --no-load-opts
Load options from rcfile. The no-load-opts form will disable
the loading of earlier RC/INI files. --no-load-opts is handled
early, out of order.
- [{v|c|n}], --version[={v|c|n}]
Output version of program and exit. The default mode is `v', a
simple version. The `c' mode will print copyright information
and `n' will print the full copyright notice.
OPTION PRESETS
Any option that is not marked as not presettable may be preset by load-
ing values from configuration ("RC" or ".INI") file(s) and values from
environment variables named:
NTPQ_<option-name> or NTPQ
The environmental presets take precedence (are processed later than)
the configuration files. The homerc files are "$HOME", and ".". If
any of these are directories, then the file .ntprc is searched for
within those directories.
AUTHOR
David L. Mills and/or others
Please send bug reports to: http://bugs.ntp.org, bugs@ntp.org
see html/copyright.html
This manual page was AutoGen-erated from the ntpq option definitions.
( 4.2.6) 2009-12-10 ntpq(1)
Mac OS X 10.7 - Generated Fri Aug 12 05:58:29 CDT 2011