NTPQ(1) General Commands Manual NTPQ(1)
NAME
ntpq - standard NTP query program
SYNOPSIS
ntpq [-inp] [-c command] [host] [...]
DESCRIPTION
The ntpq utility program is used to monitor NTP daemon ntpd operations and determine performance. It uses the standard NTP mode 6 control
message formats defined in Appendix B of the NTPv3 specification RFC1305. The same formats are used in NTPv4, although some of the vari-
ables have changed and new ones added. The description on this page is for the NTPv4 variables.
The program can be run either in interactive mode or controlled using command line arguments. Requests to read and write arbitrary vari-
ables can be assembled, with raw and pretty-printed output options being available. The ntpq 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 ntpq 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, ntpq will
attempt to read commands from the standard input and execute these on the NTP server running on the first host given on the command line,
again defaulting to localhost when no other host is specified. ntpq will prompt for commands if the standard input is a terminal device.
ntpq 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. ntpq makes one attempt to retransmit requests, and will time requests out if the remote host is not heard from within
a suitable timeout time.
Note that in contexts where a host name is expected, a -4 qualifier preceding the host name forces DNS resolution to the IPv4 namespace,
while a -6 qualifier forces DNS resolution to the IPv6 namespace.
OPTIONS
Command line options are described following. Specifying a command line option other than -i or -n will cause the specified query (queries)
to be sent to the indicated host(s) immediately. Otherwise, ntpq will attempt to read interactive format commands from the standard input.
-4 Force DNS resolution of following host names on the command line to the IPv4 namespace.
-6 Force DNS resolution of following host names on the command line to the IPv6 namespace.
-c 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). Multiple -c options may be given.
-i Force ntpq to operate in interactive mode. Prompts will be written to the standard output and commands read from the standard input.
-n Output all host addresses in dotted-quad numeric format rather than converting to the canonical host names.
-p Print a list of the peers known to the server as well as a summary of their state. This is equivalent to the peers interactive com-
mand.
SEE ALSO
/usr/share/doc/ntp-doc/html/ntpq.html for the full documentation.
Network Time Protocol November 9, 2007 NTPQ(1)
Check Out this Related Man Page
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 avail-
able. 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 execute these on the NTP server running on the first host given on
the command line, again defaulting to localhost when no other host is specified. 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.
Otherwise, [= prog-name =] will attempt to read interactive format commands 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 authenticate 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 autheinticating requests.
cooked Causes output from query commands to be "cooked", so that variables 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. Otherwise, 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. Hostname 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, dis-
plays 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 understandable) 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 combination with any of the following options: interactive.
Print a list of the peers known to the server as well as a summary of their state. This is equivalent to the 'peers' interactive
command.
-i, --interactive
Force ntpq to operate in interactive mode. This option must not appear in combination with any of the following options: command,
peers.
Force ntpq to operate in interactive mode. Prompts will be written to the standard output and commands read from the standard
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 precedes the output of "readvar" (alias "rv") when a single variable is
requested, such as ntpq -c "rv 0 offset". This option causes ntpq to include both lines of output for a single-variable 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 configuration 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 loading 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)